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S1293255819315547 | In this study to investigate the possible structural change at 550K the temperature dependence of powder X ray diffraction patterns of rhombohedral boron for a wide temperature range between 270 and 873K was measured . We indexed all powder XRD patterns as rhombohedral boron for a whole temperature range however we observed that at 550K the temperature dependence of the lattice parameters changed their slope . Moreover at a temperature 600K we observed a drastically structural and local B | We investigate the possible structural change of rhombohedral boron around 550K by powder X ray diffraction experiment. Drastically structural and local B12 icosahedral cluster volume change is observed above 550 K. Our observation is the direct verification of the inter atomic hopping of boron atom above 550K. |
S1293255819315560 | A novel hybrid nanocomposite made of cellulose matrix and pumice volcanic rock as a nature basis is presented . This heterogeneous nanocomposite is has also been applied as a suitable biodegradable catalytic system for facilitating the organic reactions . In this work firstly we try to perform well characterization on the prepared cellulose pumice nanocomposite . Further the catalytic activity of cellulose pumice nanocomposite is investigated in the synthesis reactions of 1 4 dihydropyridine derivatives . Moreover the role of ultrasound wave irradiation using an ultrasound bath with 60KHz and 150WL | A novel nature based catalytic system is presented. Synergistic effect between ultrasound waves and cellulose pumice is highlighted. Cellulose pumice composite is applied as an efficient catalyst for the first time. Natural magnetic powder is suitably immobilized on cellulose matrix. High reaction yields have been obtained for dihydropyridines synthesis. |
S129325582030011X | The high quality of reduced graphene oxide supported platinum nanoparticles was synthesized by a simple efficient rapid clean surfactant free and single step of hydrothermal assisted formic acid process . The as synthesized rGO PtNPs catalyst was extensively characterized in which demonstrated that the PtNPs have successfully anchored on the surface of rGO with the small average particle size of 4nm . The evaluation of electrocatalytic activity and durability performance of the as synthesized rGO PtNPs nanocomposite catalyst towards methanol oxidation reaction as well as the determination of electrochemical surface area were carried out by cyclic voltammogram and chronoamperometry . Besides the as prepared rGO PtNPs nanocomposite catalyst has further proved the remarkably higher electrocatalytic property which exhibited superior maximum forward peak current density 64.04mA cm | rGO PtNPs catalyst was prepared via a single step process without any surfactants. The single step hydrothermal assisted formic acid method is effective with no time consuming. Non metal formic acid was used as the chemical reducing agent. Highly uniform PtNPs dispersion on rGO was obtained by this efficient method. The rGO PtNPs exhibits superior electrocatalytic performance towards MOR. |
S1293255820300303 | A co operative non aqueous self assembly route has been demonstrated to prepare zinc glycolate complexes those are further used to engineer zinc oxide nanoparticles . Lyotropic nanocolloids are prepared via dispersing the different amount of ZnO nanoparticles in non aqueous lyotropic phases . Hexagonal to lamellar phase transition has been observed in the lyotropic nanocolloids with the addition of ZnO NPs as confirmed from the structural characterizations . Optical properties like refractive indices and birefringence of LLC is strongly modified with ZnO NPs doping . The stronger dipole moment of the NPs shifted the optical band gap of nanocolloids from semiconducting to insulating region and also influenced the net dielectric permittivity of the nanocolloids . The conductivity of the nanocolloids is measured and correlated with the optical band gap and dielectric dynamics . In addition nanocolloids show ionic charge capturing properties . | ZnO NPS have been prepared via new co operative non aqueous self assembly route. Doping of NPS is highlighted as a process to tailor new lyotropic phase. ZnO NPs dipole moment strongly alter optical band gap and dielectric permittivity of the nanocolloids. Nanocolloids can be utilized for capturing of ionic impurities dielectric and capacitive applications. |
S1293255820300418 | Nano sized CuO thin films were deposited onto glass substrate using the chemical spray pyrolysis method . These films were characterized using the x ray diffraction Raman spectroscopy and UVvisible spectroscopy . The characterization results were investigated as a function of the spray number . According to the XRD patterns all the deposited films were polycrystalline monoclinic CuO . The XRD result was confirmed by Raman spectroscopy . The lattice parameters remains mainly constant and the oriented crystallite size increased from 4 to 6nm . From the transmittance spectra the band gap energy decreased from 2.14 to 1.85eV and the mean transmittance between 400 and 800nm decreased from 35 to 5 . The decrease of the band gap energy as a function of the increasing crystallite size was explained by the quantum confinement effect . | CuO films were deposited by chemical spray pyrolysis. The direct formation of CuO was confirmed by XRD and Raman spectroscopy. The crystallite size was less than 6nm. The band gap energy decreased with the increasing crystallite size. The decrease of the band gap energy was interpreted by the quantum size effect. |
S1293255820300571 | Lithium niobate and potassium niobate crystals of near stoichiometric composition were grown with the help of the Czochralski method with liquid and ceramic charging . Birefringence of the grown lithium niobate sample is n 1.5at 1THz frequency pleochroism in absorption on 1THz frequency makes preferable the using of the extraordinary wave because of the lower absorption coefficient 14cm | LiNbO. and KNbO. crystals were grown with the help of the Czochralski method with liquid and ceramic charging. Birefringence of the grown LiNbO. is n 1.5 at 1THz. The absorption coefficient for the grown crystal of KNbO. is 24 cm. at 1THz frequency. |
S1293255820300601 | In this work CuO thin films were obtained from the oxidation at 300C of vacuum evaporated Cu thin films . The XRD patterns revealed the polycrystalline structure of the monoclinic CuO with a preferential orientation along the planes . The direct formation of CuO was confirmed by the Raman spectroscopy . The variation of the crystallographic parameters as a function of the heating time was interpreted by a collective action of intrinsic and thermal stresses . The grain growth of the CuO films was found to be controlled by the surface diffusion of pores . SEM image show the formation of homogenous structure and the O Cu atomic ratio varied between 0.8 and 1.15 reflecting the nonstoichiometry of CuO films . The UVvisible spectroscopy and the electrical measurements revealed that the band gap energy and the electrical resistivity variations were influenced by the crystallite size and the nonstoichiometry of the CuO films . The band gap energy varied between 1.73 and 2eV while the electrical resistivity varied between 2.7 and 6.5kcm . | CuO films were elaborated by thermal heating of copper thin films. The direct formation of CuO was confirmed by XRD and Raman spectroscopy. A collective action of intrinsic and thermal stresses influences the crystallographic properties of CuO films. The band gap energy and the electrical resistivity variations were influenced by the crystalline parameters of the CuO films. |
S1293255820300686 | In the present study the ternary CuNiPt alloy nanoparticles were electrodeposited on the graphenized pencil lead electrode surface and the obtained modified electrode was examined as a new electrocatalyst towards ethanol electro oxidation reaction . The GPLE was fabricated through the electrochemical exfoliation of pencil lead electrode in acidic condition on a three electrode electrochemical cell . The physicochemical and electrocatalytic characterizations of the prepared electrocatalyst were examined by means of various techniques X ray powder diffraction spectroscopy field emission scanning electron microscopy energy dispersive X ray spectroscopy elemental mapping analysis cyclic voltammetry and chronoamperometry . Comparison of the electrocatalytic activity of the introduced electrocatalysts showed that the CuNiPt ANPs GPLE has the highest and good electrocatalytic activity first anodic peak current density 101mAcm | Fabrication of the graphenized pencil lead electrode GPLE as an electrocatalyst support for EEOR. Preparation of the CuNiPt ternary alloy nanoparticles CuNiPt ANPs using a one step potentiostatic method. Physicochemical characterization of the CuNiPt ANPs GPLE and also its electrocatalytic activity towards EEOR were studied. CuNiPt ANPs GPLE has the highest electrocatalytic activity in comparison with others prepared electrocatalysts. The CuNiPt ANPs GPLE displays high long term stability which could be a promising anodic catalyst for DEFCs. |
S1293255820300716 | In this study we propose composite materials based on the LiMnTiO system to develop low cost and environmentally benign cathode materials for Li ion batteries . Specifically spinel layered Li | Introduction of ultralong spinel layered Li. MnTiO. nanofibers with diameters of about 80 nm and length of 15 m. Elucidating relationship between structure and electrochemical properties of the nanofibers. A high reversible capacity of 210 mAh g. at C 10 and 95.3 capacity retention after 100 cycles at 1C are obtained. |
S1293255820300728 | Ab initio computational methods based on density functional theory to study the structural electronic elastic and phonon properties of Cadmium Telluride were applied . SIESTA method was used for calculations with the generalized gradient approximation for the exchange correlation functional and norm conserving Troullier Martins pseudopotentials . Our calculations are carried out to investigate the high pressure behavior of the hexagonal wurtzite structured CdTe corresponding to the space group of P6 | Structural phase transitions under high pressure are obtained as. Seven intermediate states for. phase and three intermediate states for. phase are predicted. The electronic elastic and vibrational properties of CdTe are also calculated. |
S1293255820301096 | This is the first report of the atomic scale structure in iron oxides carbonates based composites produced at various autoclave temperatures from divalent Fe precursor . It is also one of the first works which demonstrates how EXAFS simulation can be utilized to additionally characterize metal compound based materials to estimate their properties associated with surface reactivity . Here we examine how greatly the autoclave temperature within a practical range of 120180C affects the composition structure surface chemistry and adsorptive anion removal of three Fe oxides carbonates built composites synthesized via urea supported hydrothermal precipitation . Divalent Fe precursor was used to promote redox transformations and consequently to increase number of phases compounds . Complementary tools EXAFS XPS and FTIR allowed to characterize the entire composites regardless of their crystallinity . It was defined that the autoclave temperature strongly influenced both the ratios between two substances in each material and speciation in each compound . Stronger reducing conditions at higher temperature in autoclave intensified generation of FeCO | Three Fe compound built composites were produced hydrothermally at 120 150 180C. The ratio between Fe oxides and Fe carbonates was a function of the temperature. Samples were characterized at the atomic scale by EXAFS XANES XPS and FTIR. Local structure around Fe was simulated using EXAFS oscillations. A methodological idea was suggested based on Fe outer shell and material properties. |
S1293255820301400 | We perform the first principles calculation based on density functional theory to study the structural electronic and mechanical properties of two MgSiO | Discover the transition pressure of monoclinic MgSiO. and trigonal MgSiO. according to the enthalpy values. For the first time offer a comparison of the band gaps of MgSiO. under pressure within GGA PBE and HSE06. Carry out a study under higher pressure up to 150 GPa for trigonal MgSiO. and 100 GPa for monoclinic MgSiO |
S1293255820301588 | A Z scheme based BiOI CdS heterojunction was synthesized by in situ stirring and calcining method . Various characterization techniques including X ray diffraction scanning electron microscopy transmission electron microscopy Raman spectroscopy diffuse reflection spectroscopy photoluminescence and photocurrent test were used to study the crystallographi structure morphology and optical and electrical properties of the as prepared samples . By constructing a Z scheme heterojunction the transfer of photogenerated carriers between BiOI and CdS is realized thereby effectively improving the photocatalytic activity . Free radical capture experiments show that O | A Z scheme based BiOI CdS heterojunction was successfully fabricated. The BiOI CdS heterojunction was active for dye degradation under visible light. Z scheme charge carrier transfer was proved by radical scavenging experiment and XPS. |
S1293255820301667 | Iron powders with high purity and controlled primary and secondary assembled particles were synthesized with reduction process to control the particle shape and thereby variation of its electromagnetic properties . Iron precursors such as iron hydroxide and iron oxide powder precursors with fine sized and acicular or spherical cubic morphology were prepared by co precipitation and hydrothermal processes and then reduced at different reducing atmospheres by using a hydrogen argon mixed gas . The electromagnetic properties were evaluated by dielectric permittivity and magnetic permeability and their loss measurements . The reduced Fe powders showed different particle shapes and sizes with different reduction conditions which affected both primary and secondary particles and thereby electromagnetic properties . The morphology of the Fe powders strongly depended on the reduction conditions and precursor s morphology . The electromagnetic properties were varied with different shapes and sizes of primary and secondary particles . It was found that the permeability is better for interconnected secondary particles with smaller primary particle size and the dielectric permittivity is much more variable than the magnetic permeability with different parameters mentioned above . | Various shapes and sizes of primary and secondary Fe particles were controlled by reduction and shape of Fe precursors. Formation of oxide phase e.g. Fe. on the surface of Fe particle degraded the electromagnetic properties. Electromagnetic properties varied with the shape of primary particle and the connectivity of the secondary particle. |
S1293255820301746 | In this manuscript we have explored the potential of Copper Zinc Tin Sulfide nano crystals for thermoelectric power generation application by the engineering of secondary phases . CZTS nano crystals were grown on various substrates multi crystalline silicon Soda Lime Glass and Indium Tin Oxide coated glass using sol gel solution technique . The grown samples were sulphurized in tube furnace at 500C for 20min under vacuum . It was observed that sample grown on mc Si has highest Seebeck coefficient of 667V | Growth of CZTS nano crystals by sol gel on different substrates. Seebeck coefficient and power factor measurements. CZTS mc Si has highest value of Seebeck coefficient and power factor. The enhancement in Seebeck coefficient is due to secondary phases in CZTS mc Si. The presence of secondary phases confirmed by XRD Raman spectroscopy SEM and UVVis. |
S1293255820301758 | In this study polyphosphazene microspheres was prepared by reaction under ultrasonic conditions using hexachlorocyclotriphosphazene and 4 4 dihydroxydiphenyl sulfone as raw materials . Phosphoric acid functionalized microporous carbon materials denoted as CS PO | The adsorbent of N P and S co doped carbon materials CS PO. was developed from the precursor. Maximum sorption capacity of the adsorbent is 964.55 mg g at pH 6.0 and 298 K. The adsorbent possesses a microporous structure with high porosity and fast adsorption rate. |
S1293255820301771 | We use Density Functional Theory within the Generalized Gradient Approximation and Perdew Burke Ernzerhof exchangecorrelation GGA PBE functional to predict the structure magnetic electronic mechanical and thermodynamic properties of | We predicted the Heusler compounds CoMnSb and FeMnSb to be ferromagnetic half metallic alloys while the Heusler like OsMnSb is found to be metallic. The present calculations show FeMnSb and OsMnSb are anisotropic while CoMnSb is isotropic in nature. The melting temperature of the compounds are predicted in the present calculations. |
S1293255820301849 | In recent years an immense interest has been focused on to develop high performance magnetic based nanocatalysts as they can be easily separated from the heterogeneous reaction mixture without filtration centrifugation process . Herein a novel magnetically recoverable and reusable MgFe | A novel magnetically recoverable MgFe. Ag. PO. composite has been fabricated via hydrothermal route. A well defined composite formed between MgFe. and Ag. PO. was confirmed by XRD FTIR and UVVisible spectroscopy. The composite demonstrated superior catalytic performance against the individual components of the composite. Strong electronic coupling between MgFe. and Ag. PO. is likely to be responsible for superior catalytic performance. |
S1293255820301874 | In the present study we report a systematic first principles study which investigates and tunes the percentage of spin polarization in few Co based full Heusler alloys Co | Co. CrX X Al Ga In compounds found stable mechanically and dynamically. Under Pressure Co. CrGa undergoes an Electronic Topological Transition ETT . This ETT drives the compound Co. CrGa from metallic to halfmetallic phase. The T. of all the compounds is found to increase under pressure. The Spin polarization of all the compounds is found to increase under pressure. |
S1293255820301941 | The Cd based solar cells possess rear contact problem in superstrate device architecture which may be eliminated by inserting a suitable buffer layer of zinc telluride films of appropriate thickness between CdTe absorber and Cu Au metal contacts . The present work meticulously reports the influence of annealing on the physicochemical properties of ZnTe thin films where ZnTe films were grown employing electron beam thermal evaporation technique and subsequently annealed for 1h in air ambient and vacuum in 100300C temperature range with an interval of 100C . Structural analysis reveals that as grown and air vacuum annealed ZnTe films have preferred reflection with zinc blende structure of cubic phase and grain size is boosted from 22 to 40nm with annealing . The direct optical energy band gap is estimated in range of 2.252.84eV and 2.652.87eV for air and vacuum annealing respectively . The contacts between the film surface and the TCO layer showed ohmic behavior as revealed by the IV characteristics . The EDS results confirmed ZnTe thin film deposition and FESEM micrographs of air annealed films demonstrated the grain growth . The AFM images of vacuum annealed films showed hill like topographies where hill density and RMS surface roughness reduced with annealing . The findings warrant that 100C air annealed ZnTe thin films could be employed as an efficient buffer layer and rear contact material to the Cd based solar cell devices . | Influence of annealing on physicochemical properties of ZnTe films is undertaken. Air and vacuum annealed ZnTe films showed crystallite size in 2240nm range. Ohmic contacts are observed between the film surface and the TCO layer. Direct optical energy band gap is found in range of 2.252.87eV with both annealing. 100C air annealed ZnTe films may be implicated as promising buffer layer in solar cells. |
S1293255820302119 | In the present study a novel hexagonal mesoporous silica functionalized by nitrilotriacetic acid anhydride and 3 aminopropyltrimethoxysilane was synthesized NH | NH. HMS NTAA adsorbent was synthesized for BSA adsorption. NH. HMS NTAA with NH. and OH groups showed high adsorption capacity via electrostatic and hydrogen binding interactions.. Maximum adsorption capacity was 1000mg g. Langmuir isotherm was the predominant model with mono layer adsorption. Adsorption was spontaneous exothermic physical and follows pseudo second order kinetic. |
S1293255820302181 | Nano crystalline powders of LuAG Eu with different grain sizes were prepared by Pechini and co precipitation methods . XRD and FTIR analyses were done . The XRD measurement confirmed the cubic structure of nano crystalline powders . The morphology and grain size of nano crystalline powders were confirmed by TEM analysis . The minimum and maximum of crystallite sizes were obtained 17 and 46nm by the Rietveld method . The results of UVVisible absorption analysis showed that the energy absorption value was increased for nano crystalline powder prepared at 900 1200C by Pichini and co precipitation methods . The emission excitation and quantum efficiency were investigated . The overall shape of emission and excitation spectra was not changed with increasing of nano crystalline powder size but the emission intensities were increased . Decay time was decreased with increasing the size of nano crystalline powders . The X ray luminescence results were examined at room temperature for different currents and a constant voltage . The luminescence intensity was increased linearly with increasing the X ray current . TL glow curves of nano crystalline powder exposed to X rays for 2 4 and 6min showed two main peaks around 400 and 600K . A glow curve deconvolution and origin software were used to calculate TL kinetic parameters . | LuAG Eu nanocrystalline powder were prepared by Pechini and co precipitation methods. Optical and luminescence properties of LuAG Eu nanocrystalline powder were studied. The nanocrystallite size was effective on QE and decay time. |
S1293255820302314 | We studied the effect of seed layer deposition time on the growth of ZnO nanorods by using potentiostatic electrolysis . Microstructural optical and photoelectrochemical responses of ZnO nanorods were determined from XRD FE SEM UVVis spectroscopy and MottSchottky measurements . Changes in seed layer time crystallinity diameter and density of ZnO nanorods were examined . The results show that the sample deposited with the seed layer time of 60s has a good crystallinity and preferred orientation along the plane and high nanorod density with smaller diameter size . The sample showed an enhanced photoelectrochemical response with low carrier density compared to other ZnO samples . The optical measurements showed high transmittance and direct band gap of around 3.24eV . The nanostructured ZnO deposited in this work is a promising candidate for photocatalytic and photovoltaic applications . | Well oriented ZnO nanorods were electrodeposited using two steps process. Density of ZnO Nanorods varies with ZnO seed layer deposition time. The films deposited with 60 s in time of nucleation shows a good physical properties. The nucleation step noticeably influences the Nanorods properties. |
S129325582030234X | PtCo alloy nanoparticles with different PtCo atomic ratios supported on a Ni bowl like pore arrays were controlled synthesized using a two step electro deposition strategy with the help of a monodispersed colloidal sphere template . Morphology characterization indicated that shaggy granular PtCo alloy was uniformly grown on the Ni ordered bowl like pore arrays . Electrochemical measurements in alkaline solution demonstrated that the PtCo Ni array with the atomic ratio of Pt Co 6 1 showed an optimal catalytic activity for methanol oxidation compared to the other PtCo Ni array the bowl like PtCo array and Pt Ni layered array . The present work provides new opportunities for the rational design of layered composite catalysts with enhanced catalytic performance for application in fuel cells . | PtCo Ni layered composite array was fabricated based on a sphere template and electrodeposition. The product was a layer of shaggy granular PtCo alloy uniformly grown on the Ni ordered bowl like pore arrays. PtCo Ni composite array exhibited high catalytic activity and stability toward the electrooxidation of methanol. |
S1293255820302673 | A Heterojunction of Au Coronene p Si Al was fabricated by thermal evaporation technique . The features of current voltage were examined under dark condition at several temperatures in 292373K range . Extensive analysis of IV curves in forward bias demonstrated that the mechanisms of thermionic emission and space charge limited currents represent the dominant mechanisms in the low and high range of used voltages respectively . The reverse IV curves were interpreted via Poole Frenkel and Schottky effects . Some specific parameters were estimated as diode ideality factor series resistance and shunt resistance . The photovoltaic manner of Coronene p Si heterojunction was shown under illumination . The cell parameters were evaluated from the analysis open circuit voltage short circuit current and fill factor . | The IV curves of Coronene p Si cell showed diode like behavior. The thermionic emission theory was dominant at low forward bias with of 0.26eV. At high forward bias a power dependence of voltage I V. was existed. The reverse bias current was interpreted in terms of the two different mechanisms. The open circuit voltage and short circuit current found as 0.3V 1.1710. mA. |
S1293255820302703 | Wurtzite form of ZnS has been prepared by heating zinc ethane thiol complex at a relatively low temperature of less than 300C . This low temperature synthesized high temperature form of ZnS is quite stable and does not undergo conversion to cubic form even at annealing temperatures as high as 900C . The | Zn SCH. CH. NMe. is a low temperature single source precursor for hexagonal ZnS. Strain in ZnS lattice decrease with increase in annealing temperatures. EPR studies confirmed Mn. incorporation at Zn. site in hexagonal ZnS lattice. Average crystallite size does not change beyond an annealing temperature of 700C. |
S1293255820302867 | In the current article it is described the preparation of a natural polymeric material formed by chitosan and a complex for application as voltammetric sensor for isoniazid using a carbon paste electrode . The material was characterized by scanning electron microscopy infrared spectroscopy X Ray diffraction and Energy Dispersion Spectroscopy . The CuFeCHT voltammetric behavior was achieved using a GPE which showed two redox couples with formal potential E | Chitosan was used as a material support for copper hexacyanoferrate II particles. A simple and easy route of synthesis was performed without further modifications on chitosan structure. The formed material as an electrochemical sensor for isoniazid drug determination. Low limit detection was achieved using cyclic voltammetry and square wave techniques. This method was applied for isoniazid detection in synthetic urine samples. |
S1293255820303150 | Copper oxide is an exciting semiconducting material with interesting structural and optical properties . Transition metal doped CuO nanostructures have great potential to use in memory device applications . In the present work we describe in detail the synthesis of pure CuO cobalt and manganese doped CuO via low temperature co precipitation method . Various techniques like X ray diffraction Field Emission Scanning Electron Microscopy Raman spectroscopy X ray photoelectron spectroscopy and Superconducting Quantum Interference Device magnetometer have been utilized to characterize the synthesized nanoparticles . XRD data exhibits a pure monoclinic phase of CuO for all synthesized samples . Surface morphology obtained from FE SEM clearly shows the presence of cluster like structure of grains . The magnetic investigations suggest that pure CuO nanoparticles exhibit the superparamagnetic state which further transforms to antiferromagnetic state with Co doping . However a peak of sharp intensity at T T | Effect of transition metals Co Mn doping on the structural optical and magnetic properties of CuO nanostructures have been studied. CuO nanostructures prepared by co precipitation method are found to have monoclinic structure with C2 c space group. The nanoflakes shape of pure CuO is found to be changed to nanoparticles for 0.2wt Co doped CuO and nanoflowers for 0.2wt Mn doped CuO respectively. XPS spectra of undoped CuO Co doped CuO and Mn doped CuO samples confirm the doping of Co and Mn in CuO nanostructures. The superparamagnetic state is found in pure CuO nanostructure while a transformation from superparamagnetic state to antiferromagnetic and spin glass state have been achieved for Co doped CuO and Mn doped CuO nanostructure respectively. |
S1293255820303460 | 1 dimensional GaN nanowires and nanorods grown using catalyst assisted Chemical Vapour Deposition are investigated for their structural and optical properties and their electronic band structure . X ray Diffraction studies reveal that biaxial strain increases with aspect ratio which is corroborated by Raman studies wherein phonon related confinement effects are observed for NR due to the crystal strain . Photoluminescence studies show 3 and 6 times enhancement in the intensity of band edge emission of NW and NR respectively signifying the presence of a large number of band tail states . A small red shift in NW and large red shift in NR is reported which are attributed to the change in the band gap and band structure of these morphologies . Valence band studies by X ray Photoelectron Spectroscopy reveal the presence of band tail states for NR and surface bond contraction for NW . The effect of crystal strain on the electronic band structure on optical properties of 1 D GaN nanostructures with different aspect ratios is elucidated . | One dimensional GaN nanostructures with high and low aspect ratio have been grown using Chemical Vapour Deposition by VLS mechanism. Photoluminescence studies reveal enhanced band edge emission BEE due to large density of band tail states. The effect of crystal strain on the electronic band structure on optical properties of 1 D GaN nanostructures with different aspect ratios is elucidated. |
S1293255820303654 | Mesoporous solid bases catalysts were prepared by impregnation of a certain amount of alkaline earthmetals species on the synthesized MCF support and used in the methanolysis of PC . Compared with the synthesized SBA 15 solid base catalysts CaO MCF catalysts with larger pore size pore volume and higher active species dispersion exhibited higher catalytic activity . The influences of supported catalyst physicochemical properties and methanolysis conditions were also investigated . The results indicated that methanolysis rate of PC was closed to 100 and yield of BPA was over 95 under the proper reaction conditions with the excellent performance of 12 CaO MCF catalyst . The catalyst stability study showed that 12 CaO MCF had good catalytic activity after five circles . At the same time the possible methanolysis mechanism of PC was proposed . | The CaO MCF catalysts having a large and open pore structure are favorable for the methanolysis of PC under milder conditions. Well dispersion of CaO crystallite on MCF could enhance catalytic performance. The catalyst is easily recycled and exhibits good chemical and structural stability. An environmentally friendly strategy was provided for methanolysis of PC waste. |
S129325582030371X | Zeolite beta with high crystallinity has been successfully synthesized by using kenyaite conversion method with seed crystals under hydrothermal treatment at 125C for 36h . The OSDA free synthesis of zeolite beta could be obtained from the mixture composition of 0.96 NaOH SiO | High crystalline and pure zeolite beta could be obtained through the conversion of kenyaite by a seed directed OSDA free rount in 36h. Changes of medium range structure during the crystallization were investigated. The various parameters as reaction temperature time the quantity of beta seeds and gel composition all have very important influence on zeolite beta synthesis. The synthesized zeolite beta with relatively high thermal stability exhibits certain catalytic performance in the cyclohexanol dehydration reaction system. |
S1293255820303769 | Studies of the dielectric behavior of chalcogenide glasses are very important for a better understanding of the transport mechanisms . The characterization of different electric properties of the ChGs in thin film form is an essential demand of the scientific and industrial research fields . This paper reports the dielectric behavior of amorphous thin films of Ge containing SeTeSn alloy . Our analysis shows that sufficient dielectric dispersion is present in amorphous thin films of each sample . Relatively few works have been done in the direction of comparing the results of dielectric constant and loss in bulk glassy samples and amorphous thin film samples of some glassy alloys of SeTeSnGe system to decide the optimized condition for technological applications and industrial production . We have also made an attempt to compare and discuss the behavior of the compositional dependence of dielectric constant and loss of thin film samples with the results of other Ge containing glassy systems reported in published works that might shed light for using these glasses in several interesting applications . | Synthesis of novel third generation glasses of SeTeSnGe system. Comparaison of dielectric data of amorphous thin films and bulk cylindrical pellets. Comparaison of results with literature for optimization of dielectric properties. Results might shed light for using these glasses in several interesting applications. |
S1293255820303915 | SiC is a two dimensional semiconductor with a direct band gap . Many authors studied its electric and magnetic properties in sheet and ribbon shapes . The previous papers have shown that SiC sheet and full saturated armchair ribbons are non magnetic semiconductor while zigzag ribbons are ferromagnetic semiconductor . In this paper we saturate only C and Si atoms of armchair ribbon by hydrogen and study its electric and magnetic properties by density functional theory . Our results show that CH saturated carbon atoms in armchair ribbon can show both FM and antiferromagnetic semiconductor states while SiH saturated silicon atoms in armchair ribbon can show both FM half metal and AFM metallic states . We found that the total magnetic moment of the unit cell is about 2B . Our results confirm that armchair ribbons can show many different magnetic states only by hydrogen saturation . | SiC sheet and full saturated armchair ribbons are non magnetic semiconductor materials. Saturated only C CH can show both ferromagnetic FM and antiferromagnetic AFM semiconductor states. Saturated only Si SiH can show both FM half metal and AFM metallic states. In FM states the total magnetic moment of unit cell is about 2B. |
S1293255820304015 | The untreated effluents from our textile industries are directly discharged into water streams thus causing a serious health hazard to aquatic as well as human life . Presently direct dye Indisole blue an azo dye has been degraded by novel hydrothermally fabricated LaCeZr | LaCeZr. SnSe composite was synthesized by facile and economic hydrothermal method. The composite showed excellent photocatalytic efficiency of 97 under visible light. The higher activity was due to reduction in e. h. recombination rate. The material also showed excellent stability as well as reusability. |
S1293255820304775 | The paper presents the results of a study of the effect of the applied potentials difference on the properties of thin films based on CoCdSe . It is shown that the use of the galvanic deposition method allows not only controlling the thickness of the synthesized films by changing the applied potentials difference but also changing the stoichiometric and phase composition of thin films . It was found that an increase in the applied potentials difference leads to the domination of the CoSe phase in the structure of thin films leading to structural ordering and a decrease in the dislocation density of defects and an increase in the density of thin films . It was found that the formation of the CoSe phase in the structure of thin films and its subsequent increase leads to a shift in the band gap from 3.5eV to 3.8eV . The change in the band gap is caused by a change in the phase composition as well as stoichiometry of thin films with a predominance of cadmium in the structure . The prospects of using thin films based on CoCdSe as the basis for photocatalytic reactions are shown . | Study of the effect of the applied potentials difference on the properties of thin films based on CoCdSe. The dynamics of the roughness and waviness of the synthesized films. The dynamics of the phase composition of the synthesized thin films. |
S1293255820304842 | Providing a good contact between electroactive materials and their substrates is an important factor for developing supercapacitors . In our work a Graphene cuprous oxide Cu | Binder free Graphene Cu. O nanocomposite is fabricated by electrodeposition. The nanocomposite acts as both anti corrosion and boosted electroactive material. Its specific capacitance is 161.31F gr at 10mVs. in 6M KOH. The synergistic cooperation is responsible for its enhanced capacitive performance. |
S1293255820304994 | In this study a facile and efficient approach to increase the magnetic property of metal organic framework 5 has been investigated . The basis of this approach is the encapsulation of cluster oxygen composition during the synthesis process of MOF 5 to form | A facile and efficient approach to increase the magnetic property of MOF 5. contain 15.23wt ZnO species more than that of MOF 5. Evaluation of the impact of additional ZnO species on the magnetic property of MOF 5. A ferromagnetic like character was observed for. nanocrystals. |
S1293255820305628 | Well organized hollow hierarchical hydroxyapatite microspheres were prepared hydrothermally via a template free process . Citrate was used as chelating or morphology regulating agent in this study . In the presence of regulating agent two dimensional monetite phase evolved into three dimensional hollow hydroxyapatite microspheres with an average diameter of 4m . Scanning electron microscopy and transmission electron microscopy studies revealed the importance of Citrate Calcium ratio in regulating the particle morphology . The results indicate that the surface morphology of microspheres can be engineered from nanosheets to nanorods by regulating agent concentration . X ray diffraction and Fourier transform infrared spectroscopy confirmed crystallinity and purity in the synthesized powders . Brunauer Emmett Teller indicated an increase in the specific surface area with the change from hydroxyapatite microspheres with nanosheets to hydroxyapatite microspheres with nanorods on the surface . Thermodynamic and kinetic theories are proposed to account for the observed changes in the surface morphology and crystal growth . | Synthesis of hollow hierarchical hydroxyapatite microspheres hydrothermally. Investigation of surface morphology change as a function of Citrate Calcium ratio. The study of the crystal growth mechanisms of hydroxyapatite and the thermodynamic evolution of surface morphology. |
S1293255820305859 | The main goal of this work is to study the effect of irradiation with protons with an energy of 0.51.5MeVat a fluence of 110 | Dynamics of changes in the degree of disorder of the crystal lattice. Studies of the mechanical and strength properties. Changes in the degree of destruction of ceramics before and after tests. The dependences of the degree of radiation damage occurring upon irradiation with protons. |
S1293255820307512 | In this paper we present the synchrotron and laboratory X ray powder diffraction experiments made at normal conditions and also at different pressures . Then crystal structure and equation of state have been determined . These results are discussed together with experimental phase diagram . The binary phases of the SnTi Ti | An ordered ternary phase was identified and studied under mechanical pressure by investigating the phase equilibrium along the section Ti. Sn Ni. |
S1293255820307792 | The semi organic non linear optical crystals of bis thiourea cadmium iodide were grown from slow evaporation of their aqueous solutions . The grown crystals were confirmed with XRD FTIR and DSC analysis . The as grown crystal faces reveal growth striations . The structural perfection was assessed by the wet chemical etching method acetic acid and formic acid are the best etchants to reveal dislocations . The strength and deformation characteristics of the crystals were assessed through laser damage tolerance Vickers and Knoop hardness measurements . The change in hardness is approximately 26 for every 4045 shift in the orientation of the crystal indicating anisotropy in hardness . The work hardening index calculated from Meyer s plot helps in distinguishing the indentation size effect . The yield strength and Young s modulus calculated using the standard relations indicate that the crystal is suitable for desired applications . | Two prospective etchants to reveal dislocations were proposed. Laser induced damage is of thermal origin with a threshold value of 0.249Gw cm. The reverse ISE is explained based on the generation and movement of dislocations. The two segment Meyer s plot can distinguish normal reverse and load independent regions. Knoop hardness changes approximately by 26 for every 4045 shift. |
S1293255820309857 | The spinel bimetal oxides with high specific surface area are favorable to promote the energy storage performance of Li ion batteries . A facile and fast colloidal solution combustion strategy is explored to the batch scale synthesis of porous zinc manganese oxide ZnMn | Porous ZnMn. with high SSA was prepared by colloidal solution combustion strategy. The colloidal silica solution has a great influence on the SSA. The ZnMn. 300 electrode shows superior Li storage performance. |
S129325582030995X | Carbon black ZnO nanocomposites have been successfully synthesized via a simple aqueous chemical growth method . The preparation of the carbon black ZnO nanocomposites by adding an appropriate weight of carbon black to the ZnO growth process can be favorable to improve photocatalytic degradation of methyl blue under irradiation of ultraviolet light . Compare with commercial TiO | CB ZnO nanocomposites can synthesize by a facile aqueous chemical growth method. CB ZnO nanocomposites exhibit high photocatalytic efficiency and reusability. CB ZnO nanocomposites exhibit higher photodegradation than ZnO and TiO. nanopowders. Carbon black CB play a critical role to enhance the photocatalytic efficiency. |
S1293255820312553 | Remediation of the dye contaminated water has received a broad interest due to the health problems and defects in the ecological system originating from the presence of such toxic materials in water . Herein | Heat treatment of manganese malonate at 350 C under Ar and H. atmospheres results in formation of. nanocomposites. The nanocomposites possess both microporous and mesoporous pores. The largest surface area was adopted by the nanocomposite obtained under H. The nanocomposite obtained under H. showed the highest removal efficiency for MB via adsorption process. Also it showed efficient photocatalytic performance for the removal of eosin Y while exposing to sunlight. |
S1293255820312589 | In the present work we study the stark shift of binding energy for a Hydrogenic donor impurity confined within a circular quantum ring composed from three different semiconducting heterostructures Al | Stark shift of donor impurity binding energy of c Al. Ga. N GaN In. Ga. N GaN Ga. Al. As GaAs quantum rings. Effect of position dependent electric field by using a charged rod of radius a and charge density. Describing the redshift and blueshift of the donor impurity binding energy by changing different parameters. Larger values of the shark shift by coinciding the positions of the impurity and the charged rod. Probability density localization and distribution by using the applied electric field and material type. |
S1293255820312607 | The present research aimed to investigate tin selenide nanoparticles films and study effects of indium dopant on their physical properties . The X ray diffraction pattern results confirmed the formation of polycrystalline nature of orthorhombic SnSe . Also addition of In dopant reduced the size of crystallite and increased the amount of strain in the crystalline lattice . Field emission scanning electron microscopy images showed nanostructures in the form of spherical shapes in nano dimensions on surface of film . Optical studies also indicated the band gap energy in an appropriate range for absorbing sunlight rays . The electrical characteristics indicated an improvement in the electrical conductivity of doped samples compared to the un doped sample so that the solar cell efficiency was obtained at 0.36 for the sample with the highest dopant concentrations . The role of In ions was investigated on the photovoltaic properties of samples by examining physical properties . | In SnSe nanoparticles deposited using electrodeposition method. The effect of In concentrations were investigated on the physical properties of SnSe nanostructures. In ions increased carrier concentrations and efficiency of SnSe solar cells. A correlation between physical properties and photovoltaic behavior was observed. |
S1293255820312632 | The reactivity and electronic sensitivity of pristine B doped graphyne and Si doped graphyne sheet toward the methanol gas adsorption were explored by calculation of density functional theory . It was discovered that the pristine graphyne unstably adsorbs the methanol gas with a 6.28kcalmol | The effect of doping on the sensitivity of graphyne to CH. OH gas is studied. The sensitivity is significantly improved by doping. B and Si doped graphyne can be used as nanosensor to detect CH. OH gas. |
S129325582031267X | The preparation of an atomically thin sheet of graphene h BN hybrid with lack of defects is almost unachievable as in three dimensional crystals . Here we first discussed the stability and electronic properties of GBN hybrid nanosheet which is formed by implanting a diamond shaped graphene island into the hexagonal boron nitride layout . We further investigated the effects of mono vacancy on the electronic and magnetic properties of defective GBN nanosheet . The band gap of pristine hybrid decreases with growing G island as expected and the island induces flat energy bands near the Fermi energy of the h BN nanosheet . We searched for the energetics of 7 distinct C B and N mono vacancies created at various places such as h BN region G region and interface of the optimized pristine hybrid . The G BN interface is found as the energetically most favourable place for vacancy formation . Depending on the size of the graphene island the C vacancy is the most favourable defect type in our DFT calculations . The N vacancy is energetically preferred over the B vacancy due to its lower formation energy with the exception of biggest G island . Although pristine hybrids are non magnetic semiconductors the GBN hybrid can become magnetic with a reasonable amount of magnetic moment depending on the type of vacancy and vacancy site . The vacancy defected hybrids also show the properties of semiconductor except for the hybrid involving the smallest size island with the B vacancy in the h BN layout VB | Nano patterning based on regular shaped graphene islands embedded at h BN. All proposed hybrids are thermodynamically feasible to synthesize. Possible to engineer the band gap of these hybrids by varying the domain sizes. Interface is energetically the most favourable place for the vacancy creation. Defects introduce flat states near E. leading to integer valued magnetic moment. |
S129325582031270X | In this paper we studied the mechanochemical reactions between a series of metal carbonates and metal hydrides in the absence of a catalyst and found that the alkaline earth metal carbonate hydride systems show better methanation performances because these systems possess favorable thermodynamic properties . Among them the CaCO | The mechanical reactions of metal carbonates with metal hydrides was investigated. The alkaline metal carbonate can be effectively reduced to methane by the alkaline metal hydride. The CaCO. MgH. system shows the best methanation performances. The CH. yield and content of the CaCO. MgH. system can reach 89 and 90 . The work provides a simple and efficient method for synthesizing H. CH. fuel mixtures. |
S1293255820312723 | Aluminum substituted magnesium ferrite MgAlxFe2 xO4 are prepared by two commonly used methods Sol gel and Solid phase reaction . Structural studies are carried out using X ray and neutron diffraction and FTIR techniques and heat generation ability in the AC magnetic field is explored by the specially designed device . Diffraction patterns revealed the formation of single cubic spinel MgAl | MgAl. Fe. ferrites. 0.0 0.2 0.3 0.7 2.0 were synthesized via sol gel SG and solid phase reaction SR methods. Diffraction patterns revealed the formation of single cubic spinel ferrites for SG and additional MgAl. phases at higher concentration of aluminium. 0.3 in SR samples. Chemical synthesis method and Al substitution contents significantly affected heat generation abilities. A lower crystallite size lower lattice volume and stronger bond strength were adopted for MgAl. Fe. SR ferrite. Compared to MgAl. Fe. SR lower heat generation performances appeared in MgAl. Fe. SG samples. |
S1293255820312735 | Structural chemical and thermodynamic behaviours of metallic nanostructures surrounded by a variety of ceramic refractory materials play a crucial role in their high temperature applications . In this work we report the effect of high temperature annealing on a system of | Study involves the effect of high temperature treatment of Au SiO. core shell nanoparticles dispersed on Si. support film. Thermal degradation of Au SiO. Si. system has been explained using minute compositional changes at different interfaces. High Angle Annular Dark Field Imaging combined with STEM EDX elemental mapping has been used for this purpose. Substantial thinning of the substrate material was observed around agglomerated gold nanoparticles |
S1293255820312747 | The shape and intrinsic pore structure of pristine and partially reduced graphene oxide aerogels hydrogels was imaged using three complementary techniques Magnetic Resonance Imaging Computer Tomography and Electron Paramagnetic Resonance Imaging . Each method is sensitive to different features of the sample CT images are contrasted with mass density changes across sample MRI with hydrogen density nuclear relaxation times diffusion and finally EPRI with radical density . The complementarity of the techniques is presented on exemplary chosen prGO aerogels which are currently researched for variety of applications such as biomaterials in tissue engineering . All techniques have their strengths and weaknesses which are thoroughly pointed out and discussed . EPRI technique which has been perfected only during last years is used here for the first time to image carbon based foams . Finally scanning electron microscopy equipped with energy dispersive X ray spectroscopy is used to characterize surface and elemental content of fabricated prGO aerogels hydrogels . | First time application of electron paramagnetic resonance imaging for volume measurements of graphene aerogels. Complementary imaging of graphene aerogels with CT MRI EPRI. Estimation of bulk volume and density of graphene aerogels with CT MRI EPRI. |
S1293255820312759 | With the increasing demand for preparing energy storage devices composites containing metal oxides have been widely developed and used as supercapacitors . However the electrochemical performances of such materials are unable to be satisfied owing to the inherent poor conductivity . Herein we employ in situ pyrolysis approach to fabricate composite electrode materials without binding agents which are obtained by the direct calcination of the mixture MnO | An efficient binder free electrode has been prepared simply through in situ pyrolysis approach. The electrodes prepared by different methods result in different performances. The performance of binder free electrodes are better than those of electrodes prepared by conventional electrodes. A flexible symmetric supercapacitor device exhibits an areal capacitance of 100.5mFcm |
S1293255820312760 | In this paper we report synthesis of ZnS and Mn doped ZnS nanosized particles by a simple and effective chemical method and their structural morphological and photophysical properties . XRD and TEM analysis confirmed the formation of nanosized ZnS and Mn doped ZnS particles . The ZnS nanoparticles were found to be of spherical shape with size 5nm which further decreases with increasing Mn doping concentration . FESEM and AFM analysis were carried out to get an insight of the morphology of the as prepared nanoparticles in thin film form . As revealed by FESEM the thin films were found to show uniform morphology along with formation of clusters due to agglomeration of the nanosized particles . AFM analysis suggests that the surface roughness of the films reduces with increasing Mn doping percentage in ZnS . UV Vis and PL analysis were carried out to study the photophysical properties of the ZnS and Mn doped ZnS nanostructures.The UVVis spectra show the presence of blue shift in the absorption peak along with an increase in band gap attributable to the quantum confinement effect . This blue shift increases as the Mn doping percentage in ZnS increases . The PL spectroscopy confirms the presence of yellow red peak arising from the doping of Mn in ZnS nanoparticles . | Low Temperature Simple Chemical Method to Synthesize ZnS ZnS Mn Nanoparticle. Uniform Particle Size of ZnS ZnS Mn Nanoparticles in 5 nm Range. Good Adhesion with Substrate and Easy Preparation of Thin Films. Less Agglomeration between the Nanoparticles resulting in Uniform Morphology. |
S1293255820312772 | A zirconium oxide powder was successfully synthesized from the detonation of an explosive emulsion previously mixed with zirconium sulfate tetrahydrate salt Zr SO | Zirconium IV oxide particles were elaborated via an explosion process. ZrO. powder was made of ultrafine spherical and crystallized particles. Explosion process is an efficient method for producing nanomaterials. |
S129325582031298X | The fuel to oxidizers ratio determines the effectiveness of combustion reaction and the amount of heat evolution . Hence optimization of F O ratio is important for the formation of phase pure ceramic powders by the solution combustion synthesis method . The present work demonstrates the effect of F O ratio on the synthesis of phase pure MgO ZnO CaO ceramic powders by SCS method and also the effect of fuels for ZnO synthesis . To understand the mechanism of the combustion reaction at different F O ratios we calculated the theoretical flame temperatures by using the thermodynamic concept and analyzed . Using this information in association with the phase content of the synthesized samples we described the role of fuel to oxidizer ratio in synthesizing ceramic materials by SCS method . We found that F O strongly controls the structural nature and characteristics of the synthesized ceramic powder products . Furthermore comparing the nature of combustion products for divalent and trivalent cation based ceramics we conclude that solution combustion synthesis favors the synthesis of trivalent cation based oxides over purely divalent cation based oxides . Our work provides the insights into the understanding and the importance of using proper fuel to oxidizer ratio in synthesizing phase pure ceramic powder by SCS method . | Fuel to oxidizer F O ratio in solution combustion synthesis SCS of CaO MgO and ZnO determines the phase purity. For F O away from 1.0 the powder properties are controlled through incomplete combustion. Heat of combustion decides the phase purity and crystallinity of ceramics depending on F O ratio. F O ratio controls the particle size and the defects in ceramic materials. SCS method suits best for ceramics containing trivalent 3 cations than divalent 2 cations. |
S1293255820312991 | A novel and efficient protocol for tandem oxidative amidation of alcohols to amides with copper modified well ordered mesoporous graphitic carbon nitride Cu g C | Cu g C. was synthesized through facile in situ immobilization of Cu II on the porous g C. from low cost cyanamide. Cu g C. was applied as an efficient heterogeneous catalyst for one pot tandem oxidative amidation reaction. Cu g C. showed impressive catalytic activity for the synthesis of various amide derivatives. The Cu g C. was recycled several times without copper leaching and loss in its activity. |
S1293255820313017 | Efficient methods for the synthesis of carbon nanostructures with high specific surface area and controlled morphologies are crucial for their use in various applications . Here we report a low temperature precursor method for the synthesis of nanostructured carbon materials and show how the aggregate morphology and the specific surface area of isolated carbon materials depend on the composition synthesis conditions and chemical nature of the precursor . Complex zinc compounds capable of a pseudomorphic transformation into composites of the general composition ZnO nC during heating in an inert gaseous medium were used as precursors . The ZnO nanoparticles were washed from the composites by diluted formic acid . The obtained carbon materials exhibit different morphologies and specific surface areas up to 1706m | Carbon nanostructures with controlled morphologies were prepared by the precursor method. The sample obtained from zinc glycerolate has the highest specific surface area. Materials can be used to remove nickel ions from contaminated aqueous solutions. |
S1293255820313029 | High energy density and low cost anode materials are essential for lithium ion batteries . Herein we proposed a strategy that combined electrospinning technique with water bath method to prepare a free standing nanorod structured | composite was prepared by electrospinning technique. 3D vertical ZnO nanorod promotes fast redox reaction kinetics. Carbon fiber constructs a transportation and diffusion path for electron and Li. The. film exhibits good cycling and rate capability for the Li ion batteries. |
S1293255820313042 | Photodegradation has been taken as a promising technology in solving global environmental pollution . In this paper the flower like hierarchical architecture of BiOI ZnO | Flower like hierarchical architectures of BiOI ZnO were synthesized. p n junction between p type BiOI and n type ZnO was constructed. The formation of p n junction fascinated the separation of photogenerated carriers. BiOI ZnO composites showed remarkable visible light photodegrading activities. |
S1293255820313066 | Physicochemical properties of copper aluminum and cadmium oxides determine their application in different ways . Electrochemical metal oxidation using alternating current influences the band gap of prepared copper containing oxide materials and result in a blue shift . The use of alternating current provides sufficient conditions responsible for nanosized materials formation . In the present work XRD and DSC DTG SEM analyses were used to characterize the electrolysis products . A decrease of the thermal transformation temperature Cu | Nano sized particles are formed by non equilibrium electrochemical metal oxidation. AC electrolysis decreased the temperature at which phase transformation of the products occur. Layered double hydroxides are formed by carbonization of Cu and Al electrolysis products. |
S1293255820313091 | In this research study we investigate the structural electronic and optical properties of the Cr doped rocksalt CdS using a full potential linearized augmented plane wave method within the density functional theory . The calculations are made within the GGA and GGA U approaches employed in the Wien2K code . Adding the Hubbard term gives better description of the system with strong correlation of | Electronic structure optical properties of CdS Cr system have been studied using Wien2K code employing GGA GGA U. Lattice parameters bulk modulus minimum stable energy cohesive energies are found. Dominating role of Cr atoms found in tuning electronic optical properties. Optical spectra suggest CdS Cr may potentially be used in developing UV optoelectronic sensors devices. UV technology may be economically commercialized using CdS Cr. |
S1293255820313108 | In the present work the influence of pH on the microstructure and magnetic properties of pure and doped ZnO nanoparticles with Fe is reported . Specifically we synthesize nanoparticles using the sol gel method with pH 3 6 and 9 . For pure ZnO it is verified that the lattice constants crystallite size lattice strain dislocation density | Pure and Fe doped ZnO nanoparticles were synthesized by the sol gel method. The structural and magnetic properties are dependent of the pH value. ZnO samples show paramagnetism in combination with typical diamagnetism |
S129325582031311X | Fine grained boron carbide and metal boride composites are known for their superhardness which is used in many industrial technologies . The introduction of binder components in free metallic state and or additional ceramic components can further improve the material mechanical properties by making it more dispersive . A new chemical method is proposed for the synthesis of the fine grained powder complex composites boron carbidetitanium diboridetungsten boridecobalt B | A novel chemical route of synthesizing complex compositions boron carbidetitanium diboridecobalttungsten carbide B. CTiB. CoWC in fine dispersive powdered form is developed. Metallic cobalt added in ceramic composite boron carbidetitanium diboride reduces particles size and changes their morphology powder becomes almost mono dispersive. Adding of composite component cobalttungsten carbide into hard ceramic composite boron carbidetitanium diboride has to lead to palpable improvement in mechanical properties of compacted material. |
S1293255820313248 | This article carries the findings of the effect of shock waves on glycine phosphite powder samples which have been investigated under pre and post shock loaded conditions with the shock pulses of 50 and 100at the Mach number of 2.2 . Molecular structural stability and crystal structural stabilities have been established by Fourier transform infrared spectroscopy and powder X ray diffractometry . From XRD studies it has been observed that there is change in crystalline peak intensity peak distortion and formation of new peaks in shock wave loaded samples whereas no alteration in the original crystal system . There is no change observed in FTIR profiles at shock loaded conditions . The obtained crystallographic studies prove with substantial evidence that the crystal has molecular stability and stable crystallographic structure against the impact of applied shock waves . On the other hand many of the crystalline planes have disappeared and re appeared with respect to number of shock waves but maintaining the same crystallographic phase . From the shock wave impact study the authors suggest that GPI crystal particularly orientation is suitable for devices used in harsh environment and high power laser application due to the relative stability of the crystalline properties . | Molecular and crystallographic phase stabilities on GPI powder samples at shocked conditions are reported. FTIR results reveal that GPI sample has spectacular molecular stability at shocked conditions. XRD results show that stable crystal structure stability at shocked conditions. Particularly 21 1 orientation is highly suitable for device applications due to high shock resistance. |
S1293255820313273 | Indoor plant growth can protect crops from damage caused by climate variations in outdoor lighting systems . For indoor plant cultivation artificial light sources are needed to enhance the plant growth . Regarding this problem a series of SrZr | Dy doped SrZr. PO. nanophosphors were prepared using the sol gel method. Rietveld refinement of XRD was carried out. Surface states of the phosphors were studied by XPS. The phosphor has shown CIE values 0.30 0.29 and CRI 77. |
S129325582031339X | PdxAuy loaded reduced graphene oxide on nickel foam were synthesized in a simple and green way of spontaneous reduction . Different characterization methods including XRD Raman spectra SEM TEM and XPS were used to investigated the chemical composition morphology and structure of the composites . The catalytic activity of the prepared electrodes were estimated by means of cyclic voltammetry chronoamperometry and electrochemical impedance spectroscopy . Graphene oxide was firstly reduced by Ni foam directly and then noble metal ions were reduced by reduced graphene oxide supported on the surface of Ni substrate . By varying the palladium gold mole ratios into 4 1 5 1 and 6 1 the optimized P | The PAGN composites were prepared via a facile method of spontaneous reduction. The composites properties changed with the atomic ratio of Pd and Au increasing. The PAGN electrode showed excellent activity as the atomic ratio of Pd and Au is 5 1. The P. GN electrode exhibited exceptional stability for methanol ethanol oxidation. |
S1293255820313418 | Plate like hureaulite is successfully synthesized via a simple precipitation technique and its vibrational and thermal behaviors are investigated . Its composition stabilizes at up to 165C and decomposes to Mn | Simple synthetic route for hureaulite Mn. PO. PO. OH. H. O. mineral. Confirmation the LiMnPO. formation by using synthetic hureaulite as a new precursor. Report on the relationship between thermal and vibrational behaviors. Report on the factor group splitting analysis theoretical vibrational bands . Applying the deconvolution function for the complex thermal decomposition. |
S1293255820313510 | Ce carbonaceous matrices based composites with potential application in electrochemical processes were successfully produced . Ce based MOF 76 Metal Organic Framework 76 family formed by lanthanide ions coordinated to 1 3 5 benzenetricarboxylic acid ligand H | Ce BTC and Ce BTC GO. were synthesized then calcined to CeO. and CeO. rGO. Differences in shape size and surface area are observed for all compounds. Properties of Ce. Ce. redox pair are observed for all Ce based compounds. GO and rGO both improve the electrochemical behavior of the composites. Composites show low resistance to electron transfer and capacitive properties. |
S1293255820313601 | We propose a reaction scheme to selectively separate lithium ions from an aqueous urea solution by formation of lithium aluminum layered double hydroxide on aluminum metal foils . The repeated cycles of adsorption and desorption of lithium ions are possible using the topotactic reaction of lithium salts with Al | Lithium immobilization on Al metal was performed in aqueous solution in the form of LiAl. LDH. Growth of LiAl. LDH strongly depends on lithium as well as urea concentrations. Lithium recovery capability was 8g cm |
S1293255820313613 | It is reported that two compounds containing several rare earth elements simultaneously was obtained recently . It is proposed to call them polyelement solid solutions . Single crystals of RE hexaborides and RE digallides PSS were obtained some of their characteristics and features are given . These PSS were obtained by mass crystallization from melts solutions in Al and Ga . PSS hexaborides exhibit a densification of their crystal structure when RE atoms are introduced into the base LaB6 crystal lattice . The incorporation is facilitated by the presence of a homogeneity region in RE hexaborides and RE digallides . The stepwise chemical analysis of the recently obtained 6 element PSS of lanthanum hexaborides and digallides shows a high uniformity of the RE distribution along the sample . The complex process of the formation of PSS of hexaborides RE and digallides of RE is analyzed and the possibility of obtaining different groups of PSS is discussed . | Polyelement solid solutions of RE hexaborides and RE dihallides have been obtained and investigated. An excellent homogeneity of RE distribution in 6 element hexaboride LnB. was determined. The compaction of the crystal structure of polyelement LnB. solid solutions was established. The microhardness of polyelement LnB. solid solutions was increased markedly. |
S1359836818332487 | Herein nanozeolite carbon nanotube composites with the covalently immobilized enzyme as novel bionanocomposites were synthesized and used for pollutant bio degradation . Different amounts of carbon nanotube were used to synthesize carbon nanotube zeolite nanocomposites . The synthesized nanomaterials were silanized and cross linked by glutaraldehyde . Finally the enzyme was immobilized on them to prepare Laccase immobilized nanomaterials . The biocatalysts were characterized using Scanning electron microscopy X ray diffraction pattern Fourier transform infrared Brunauer Emmett Teller and Transmission Electron Microscopy . The effect of operational parameters on bio degradation was investigated and optimized . The synthesized biocatalyst nanocomposite retained more than 95 of its initial activity over the first 5 cycles and its efficiency is still intact . After 10 cycles relative activity decreased gradually to 69 . Results revealed much higher stability for Laccase after the immobilization and 84 of the maximum activity of nanocomposite was preserved at 80C . The activity of free Laccase lost over 60 of its activity after 8 days of incubation while the nanocomposite retained about 80 of its maximal activity . They had high storage stability over 8 incubation days and good performance at thermal stability experiments . | The novel bionanocomposites with covalently immobilized enzyme were synthesized. Organic biodegradation by biocatalyst followed the Michaelis Menten model. Biocatalyst retained more than 95 of its initial activity over the first 5 cycles. The nanocomposite retained about 80 of its maximal activity. |
S1359836818333134 | A Ni Co metal organic frameworks and its reduced graphene oxide composite has been fabricated through a room temperature route using simple 3D linker as trimesic acid . The crystalline nature morphology functional groups and thermal stability of the prepared materials are characterized via XRD SEM Raman and TGA studies . The synthesized Ni Co MOF rGO reveals spherical particles decorated rod like morphology with a length of 310m . The incorporation of rGO into the Ni Co MOF enhances conductivity and electrochemical performance . The electrochemical properties of Ni Co MOF and its rGO composite are evaluated in 1M KOH . The produced Ni Co MOF rGO composite 1162Fg | Ni Co MOF and its rGO composite was prepared at room temperature. Ni Co MOF rGO composite shows spherical particles decorated micro rods like morphology. A higher specific capacitance value of 978 and 1162Fg. was achieved for Ni Co MOF and Ni Co MOF rGO composite materials respectively. |
S1359836819309771 | The aim of this paper is to evaluate the influence of sustainable surface treatments performed on flax nonwoven fabrics as textile reinforcement on the durability of calcium aluminate cement based composites . Two treatments are considered an alkaline treatment and a treatment with soybean oil . The cement hydration was studied by analysis of back scattered scanning electron microscopy images which revealed variations nearby the fibers owing their capacity for water absorption and presence of oil on the surface . A retarding effect on cement hydration was observed on the composites prepared with the oil treated fabrics . The composites containing the alkali treated fabrics had better mechanical properties and also the highest durability . For these composites it was found an optimized fiber matrix adhesion and penetrability of the cement to the fabric . | CAC based SHCC durable composites with natural nonwoven fiber reinforcement were successfully developed. Treatments applied to the fibers helped to improve the durability of the composite s flexural behavior. Soybean oil treatment led to a better material s performance after the accelerated aging. Composites presented an average maximum bending strength of 15MPa and 20mm deflection. |
S135983681931220X | Aim of the present paper is to evaluate how the bearing behavior of pinned flax composites can be influenced by their exposition to critical environment such as marine one . To this scope flax fibers epoxy pinned laminate was exposed up to 60 days to salt fog environment according to ASTM B 117 standard . | Bearing behavior of pin loaded flax laminates was investigated in severe environmental conditions. Bearing stress evolution and failure mechanisms were evaluated at varying pin diameter and hole to sample edge distance. Salt fog aging induced modification on the mechanical performances of the pinned composite joint. Failure map was developed showing a progressive modification of damage mechanisms transitions at increasing aging time. Threshold values of E D and W D at varying salt fog exposition time were defined. |
S1359836819317548 | The present work presents results from an analysis of the mode I and II interfacial fracture behavior of a new adhesive joint between thin titanium and CFRP adherents that is destined for application in the future aircraft s leading edge . The joint is stiffened with two aluminum beams to prevent large deformations during testing . An engineering approach for the design of fracture toughness tests for the present joint is followed . The vacuum assisted resin transfer molding technique is employed for the manufacturing of specimens subsequently tested using the double cantilever beam and the end notched flexure configurations . Towards the fracture toughness determination from the experimental data a new analytical model that considers the bending extension coupling induced by the presence of the aluminum beams and the manufacturing induced residual thermal stresses is applied . The analytical fracture toughness predictions are validated by two dimensional finite element analyses . Crack propagation analyses based on the virtual crack closure technique and the cohesive zone modeling are performed to capture the experimental behavior and extract useful fracture toughness properties of the joint . A comparison of various literature s data reduction schemes reveals the level of error if factors such as the bending extension coupling and or the residual thermal stresses are ignored . | Interfacial fracture tests design for a new dissimilar adhesive joint between thin adherents. Residual thermal stresses effect on the fracture toughness of a new titanium CFRP joint. Numerical and experimental study of the fracture behavior of the new joint. Experimental data reduction using various analytical models of the literature. |
S1359836819320797 | The alkoxysilane isocyanate terminated polyurethane was prepared as bio adhesive . For this purpose a bio polyol was synthesized and modified by epoxidized soybean oil and tetra ethyl ortho silicate respectively . In the following this modified bio polyol was reacted with polymeric 4 4 diphenylmethane diisocyanate to form the bio adhesive . The performance of the bio adhesive was improved by using zinc oxide nanoparticles ZnO NP | Preparation of polyol based on renewable source. Modification of polyol molecular structure using TEOS TEG and ZnO NPS and DBTDL catalyst. Preparation of bio based silane modified polyurethane adhesive with high adhesion strength. Application of the Taguchi method for optimization of the required modifier values. Investigation of thermal stability of silane modified polyurethane. |
S1359836819321262 | Carbon nanostructures has recently used in the energy storage devices broadly and in the Li ion battery instruments as well . In the present work the effect of AlV | Strategic design of AlV. spheres by PEG assisted hydrothermal method to form of flower shaped structures. Preparation of AlV. Graphene MWCNTs and GQDs as two to zero dimensional carbon nanostructures. Investigation of effect of dimension of carbon nanostructures on capacity and cycle ability of LIBs. Study the effect of weight percent of carbon nanostructures as an important factor to reach optimum. |
S1359836819322978 | Sheet based 3D periodic cellular structures attract great attentions due to their lightweight and excellent mechanical properties . Unlike other traditional honeycombs and lattice structures sheet based cellular structures consist of triply periodic minimal surface cores which are continuous through space with a porous cavity surrounded by continuous surfaces . In this study the crashworthiness of four types of TPMS sheet structures under axial loading was investigated . According to the results obtained by the nonlinear finite element analysis the level constant in the implicit form of TPMS and the shell thickness of TPMS sheet structures were found to affect the crashworthiness significantly . To achieve an optimal design a metamodel based multi objective optimization method was developed to optimize the four types of TPMS sheet structures . Three different metamodels i.e . Kriging polynomial response surface and radial basis function were compared to identify the most accurate model which was then utilized for the optimization . Followed by the multiobjective optimization four Pareto fronts of these TPMS sheet structures were plotted and compared of which the FRD sheet structure was found to have the best energy absorption capacity . Moreover the crashworthiness of the TPMS sheet structures was compared with that of the other materials or structures in nature and engineering and an Ashby plot was given . Overall TPMS sheet structures possess excellent specific energy absorption and specific strength and show great potential for engineering applications . | The crashworthiness of four sheet based 3D periodic cellular structures consist of TPMS was investigated and compared. The rule of the deformation modes of four sheet based 3D periodic cellular structures under crushing load was given. The optimal designs of the four sheet based 3D periodic cellular structures were obtained using the MOO method. The optimal sheet based 3D periodic cellular structure was found to have extremely excellent crashworthiness. |
S1359836819325442 | Wrapping the structures with composites and adopting multi cell sections are two typical methods to improve the crashworthiness of thin walled beams . However the effects of combining these two methods on crashworthiness are not clear . This paper aims to investigate the bending collapse and crashworthiness of the multi cell aluminum carbon fiber reinforced plastic hybrid tubes under quasi static and dynamic loading . Three point bending tests are firstly conducted for the CFRP Al and Al CFRP square tubes with single or multi cell sections . The deformation characteristics and crushing force responses of the tubes are analyzed and the energy absorption performances are evaluated . The bending resistance of the Al tubes is increased by up to 41 attributed to the CFRP enhancement . The non linear finite element software ABAQUS Explicit is then employed to simulate the tests and help analyze the deformation mechanisms . Parametric studies are performed to investigate the influence of the Al wall thickness the number of CFRP plies loading velocity partial wrapping and sectional shape on the crashworthiness of Al CFRP tubes . Results show that the Al wall thickness partial wrapping and sectional shape have a significant influence on the deformation pattern and force response of Al CFRP tubes while the number of CFRP plies and the loading velocity have a relatively small influence . The specific energy absorption of Al CFRP tubes can be increased by 11 by introducing partial CFRP wrapping and in all cases the multi cell Al CFRP tubes outperform the single cell counterparts in crashworthiness performances . | Quasi static and dynamic three point bending tests are conducted for Al CFRP tubes. Numerical analyses are performed to simulate the tests and analyze the mechanisms. The bending responses and energy absorption performances of tubes are analyzed. The influences of various factors on the bending responses of tubes are investigated. The multi cell Al CFRP tubes outperform the single cell counterparts in crashworthiness. |
S1359836819326733 | The study is focused on multifunctional performance of carbon nanotubes and Graphene nanoplatelets reinforced PEEK composites enabled via fused filament fabrication additive manufacturing utilizing in house nanoengineered filaments . Thermo physical mechanical and wear characteristics of electro conductive PEEK nanocomposites are reported . The coefficient of thermal expansion is found to decrease by 26 and 18 with the incorporation of 5wt GNP and 3wt CNT into PEEK polymer respectively . The decrease in CTE provides better dimensional stability to resulting nanocomposite structures . Due to uniform dispersion of CNT and GNP in the PEEK matrix the crystallization temperature and degree of crystallinity are both increased . The 3D printed PEEK nanocomposites reveal interfacial voids between the beads and intra bead pores and thus exhibit lower density compared to that of the 3D printed neat PEEK . Young s and storage moduli are found to increase by 20 and 66 for 3wt CNT loading and by 23 and 72 for 5wt GNP loading respectively . However the PEEK nanocomposites exhibit similar tensile strength to that of neat PEEK . The coefficient of friction obtained from fretting wear tests is found to decrease by 67 and 56 for 1wt CNT and 3wt GNP loaded PEEK nanocomposites respectively and the decrease is attributed to reduced hardness and increased porosity . Multifunctional performance of carbon nanostructures reinforced AM enabled PEEK composites demonstrated here makes them suitable for a range of applications such as orthopedics oil and gas automotive electronics and space . | The crystallization temperature and degree of crystallinity of AM PEEK increase with the addition of carbon nanostructures. The CTE of PEEK nanocomposites decreases by 26 and 18 with the addition of 5wt. GNP and 3wt. CNT respectively. Youngs modulus of PEEK increases by 20 and 23 by the addition of 3wt. CNT and 5wt. GNP respectively. The PEEK GNP exhibits ductile fracture with concomitant increase in strain at break and toughness relative to neat PEEK. The coefficient of friction decreases by 67 for 1wt CNT and 56 for 3wt GNP due to reduced hardness increased porosity. |
S1359836819327581 | In this study we demonstrate enhanced mechanical properties of three dimensional graphene hydroxyapatite nanocomposites by employing the Taguchi method . The hydrothermal process time the total pressure the hydrothermal temperature and the weight percent of graphene to the hydroxyapatite were considered as control parameters . The results showed that all parameters were effective in controlling the process . According to the findings the hydrothermal temperature had the greatest effect on the results . The predicted strength fracture toughness was 2.080.03 MPa.m | Hydrogen gas has led to reduction of graphene oxide. The presence of graphene sheets improved mechanical properties of hydroxyapatite. The results showed that all parameters are considered as an effective parameter in the process. According to the findings the hydrothermal temperature had the greatest effect on the results. The predicted fracture toughness was 2.080.03 MPa.m |
S135983681932921X | The strength ductility trade off dilemma has inhibited the applications of many structural materials TiAl alloys in particular . Here we report a new insight into the potential for increasing the ductility of Ti | Ti. AlN 10. 3 TiAl 111 incoherent interface plays a dual role during the compression. This incoherent interface has a hierarchical atomic structure. This incoherent interface bonding characteristics are multiple and inhomogeneous. The weakest interface region can act as the nucleation site for primary dislocation. The local disordered interface region can act as the sink for secondary dislocation. |
S1359836819329695 | Cytosine pyrophosphate was prepared by using pyrophosphoric acid and cytosine . The structure morphology and thermal stability of PPA C were analyzed by using Fourier transform infrared spectroscopy scanning electron microscopy and thermogravimetric analysis . The PPA C was used as acid and gas source and pentaerythritol as charring agent to form an intumescent flame retardant system which was applied to improve the flame retardancy of polypropylene . The flame retardancy and thermal degradation behaviors of PP IFR composites were investigated by vertical combustion limiting oxygen index and cone calorimeter TGA etc . The PPA C and PER have good synergistic effects on improving the flame retardancy of PP which is better than that of commercial ammonium polyphosphate and PER system . The PP IFR composites with 18wt PPA C PER achieves the UL 94 V 0 rating and a LOI value of 28.8vol . The PPA C reacts with PER to form P O C and P C during combustion which helps the formation of intumescent char layer . In addition the IFR makes PP degrade in advance and form more char residues at high temperature . Proper ratio and amount of PPA C PER promotes the formation of intumescent char layer without defects during combustion reduces the heat release rate and delays the thermal degradation of PP composites thus improves the flame retardancy of PP . | A bio based flame retardant PPA C was prepared by using pyrophosphatic acid PPA and cytosine C . UL 94 V0 rating is achieved for PP composites with 13.5wt PPA C and 4.5wt PER. PPA C PER promotes the formation of intumescent char layer without defects. |
S1359836819329786 | Thermo mechanical properties of amine functionalized graphene oxides filled polyurethane nanocomposites have been investigated in this work . Graphene oxide was functionalized with | Influence of amine functionalized GO in the properties of polyurethane. Exceptional improvement in mechanical properties at ultra low loading 0.1wt . Hydrophobic nature of amine functionalized GO filled polyurethane nanocomposites. Amine functionalization has significant influence in enhancing the properties of polyurethane nanocomposites. |
S1359836819329853 | Advances in bio based composite materials offer potential opportunities for economic revalorization of agroindustrial residues such as starchy tubers peels and bagasse . In this work cassava and ahipa peels and bagasse are studied as potential fillers of thermoplastic corn starch films . It was assessed the effect of studied organic fillers on thermal stability as well as optical water vapor barrier and mechanical properties of TPS . In all cases type and content of the filler had a great impact on the biocomposites properties . Results demonstrated that these fillers modify TPS properties and gives utility to these residues with low economic cost . | Cassava and ahipa starch extraction by products were used as biomaterials fillers. . Thermomechanical properties were significantly affected by residue type. Mechanical behavior of thermoplastic corn starch was improved by filler addition. Filler type and content had a great impact on composites color and optical barrier. |
S1359836819329968 | Graphene oxide modified cementitious materials have the potential to be increasingly applied in a range of important areas due to the enhanced microstructure mechanical properties and durability . This work presents a thermodynamic focused analysis of tricalcium silicate Fe FC | GO can increase the Si concentration while reducing the Ca concentration during the first 2h of hydration. GO can improve the undersaturation of C. S and supersaturation of portlandite while reducing the supersaturation of CSH. GO can facilitate both dissolution rate of C. S and precipitation rate of CSH. GO can promote the overall hydration degree and hydration rate of C. S. |
S1359836819330112 | Much attention has been given to flexible electronic devices in recent years . Conductive polymer composites have been utilized to fabricate strain sensors owing to their lightweight and high flexibility . It is a great challenge to develop flexible and wearable strain sensors with light weight good skin affinity and gas permeability high sensitivity and excellent corrosion resistance . In this work electrospun thermoplastic polyurethane nanofibers were first decorated by graphene through ultra sonication followed by polydopamine modification and then hydrophobic treatment with 1 | A flexible and conductive polymer nanofiber composite CPNC is prepared. The CPNC possesses a polymer core graphene shell structure. The CPNC possesses excellent superhydrophobicity and corrosion resistance. The CPNC strain sensor shows high stretchability sensitivity and good durability. The CPNC strain sensor can be used for full range detection of human body motions. |
S1359836819330161 | There have been major efforts to make polyacrylonitrile flame retardant using halogens heavy metals transition metals and phosphorus organic compounds . These retardants may reduce the risk of fire but they also involve high cost toxicity and related ecological issues . In an effort to mitigate some of these negative factors we herein report the development of a green flame retardant PAN based on bio inspired dopamine methacrylamide co monomer . This polymer was synthesized through free radical polymerization of AN and acetonide protected dopamine methacrylamide followed by deprotection of ADMA . Systematic investigation of the structural evolution of P AN | The bio inspired DMA co monomer and polymers P AN. DMA were newly synthesized. Catechol unit of P AN. DMA provides a kinetic advantage for TOS process and high flame retarding properties. P AN. DMA showed ultra low heat release capacity 58 Jg. and high limiting oxygen index 37 . |
S1359836819331452 | As the soul of cement based materials hydration is a complex process involving many chemical reactions which is one of the intrinsic driving forces for the evolution of the microstructure and macroscopic properties of cementitious composites . The predominant lines of previous researches on cement hydration models are dominated by spherical particles . However the actual shape of cement grains is non spherical . Herein a continuous based hydration model of non spherical cement particles is developed in which the hydration kinetics strongly depend on the morphological features of cement grains . Subsequently the proposed HYD NSP model is validated by experimental results . By applying the HYD NSP model we further investigate the evolution of microstructures of cement paste including icosahedron shaped cement grains over time . Results reveal that the influence of the shape of cement particles on the degree of hydration and the porosity of cement paste is mainly reflected by their specific surface area . | A continuous based hydration model of non spherical cement particles is developed. Hydration kinetics strongly depend on the morphological features of cement grains. The proposed theoretical model is validated by experimental results. The evolution of microstructures of cement paste is investigated by this model. |
S1359836819332731 | In this study the feasibility of a novel tactile display based on the magnetorheological elastomers was studied . To this end initially a survey on various requirements of tactile displays for surgical applications was performed . The survey showed that MREs would make a good fit for tactile displays . To further study the MREs the samples were characterized perpendicular to the magnetic field similar to the actual use cases . Also to compensate for the loss of MR effect due to the non parallel application of compression and magnetic field MREs were composited in bi layer configuration with a non MRE elastomer . The results of mechanical characterization showed that bi layer composition increased the MR effect in MREs by 42 . This study showed that further enhancement of MR effect in MREs is possible through bi layer composition with a non MRE elastomer . Also it was shown that the development of an MRE based tactile display is feasible using the proposed enhanced MRE composites . | MREs are the most compliant modality for tactile displays in minimally invasive and robotic surgery applications. MR effect of various MREs were enhanced through bi layer composition with a non MRE without changing iron particle content. The enhancement of MR effect through bi layer composition was comparable to the effect of increasing iron particle content . |
S1359836819332755 | Environmental concerns over chemicals used for protecting wood and wood products from biological degradation have prompted the development of natural wood preservatives with lower health risks and prolonged efficacy . In this study an effective and environmentally friendly method is demonstrated to substantially improve the durability of a strand based wood composite product by incorporating a natural wood preservative system . Specifically allyl isothiocyanate a mustard oil based natural biocide was encapsulated into the cavity of cyclodextrin and the as prepared CD AITC complex was applied in the strand based composite manufacturing process to produce a natural preservative treated engineered wood panel . The formation of the CD AITC complex was qualitatively confirmed by attenuated total reflection Fourier transform infrared spectroscopy and the inclusion yield of AITC was estimated to be 71 by thermogravimetric analysis . The preservative complex was blended with southern pine strands at 0 5 and 10 prior to the application of polymeric methylene diphenyl diisocyanate resin and hot pressing . The application of the preservative system significantly improved decay resistance against brown rot fungi | Volatile natural biocide allyl isothiocyanate was encapsulated in cyclodextrins. Feasibility of cyclodextrins as carriers for volatile compounds was confirmed. Natural preservative complexes were added to strand based wood composites. The preservative treated composites exhibited improved decay fungi resistance. The treated composites internal bond strengths met the European standard level. |
S1359836819333384 | In recent years lithium ion batteries have become the battery technology of choice for portable devices electric vehicles and grid storage due to their superior electrochemical performance and portability . Despite the successful commercialization of lithium ion batteries in portable electronic devices intensive research on high energy density anode materials for lithium ion batteries is still ongoing to meet the ever increasing high energy demand for upcoming advanced self powering smart portable electronics and large scale applications ranging from electric vehicles to power grids . In this regard Surfactant assisted cobalt metal organic framework is synthesized through a solvo thermal method and after Sn deposition uses as an anode in lithium ion batteries . Using PEG400 resulted in a MOF with different trigonal lattice while a monoclinic structure is obtained when no surfactant is used . The presence of PEG400 polymeric surfactant with its role of orientation leads to the creation of special structural order and creates an array of structural units with a trigonal network which is completely different from the composition creates in the same synthesis conditions with monoclinic structure . Different electrochemical behavior toward lithium insertion extraction is attributed to different atomic packing factor . The trigonal structure synthesized at the presence of PEG400 shows better electrochemical performance compared to MOF1 at the absence of surfactant . Discharging capacity of the trigonal structure in the first cycle is about 615mAh.gr | We designed and synthesized a Sn based reduced on Co MOFs anode. All physical and electrochemical parameters were extracted and analyzed for lithium ion battery application. The cyclability is much improved in comparison with the tin cobalt system and represents a growth of approximately 72 207 versus 120 cycles . |
S1359836819333724 | Compared with normal concrete ultra high performance concrete is of increasing interest for bridge engineering because of its superior tensile strength compressive strength and significantly enhanced durability . The creep and shrinkage effect have a significant influence on the long term behavior of UHPC . However the existing research on the time dependent behavior of UHPC is still limited . In this research based on numerical integration method the ABAQUS user subroutine for simulating creep and shrinkage of both normal concrete and UHPC were developed by the recursive algorithm of adjacent stress increment in the time history . The accuracy of developed user subroutine was validated by creep and shrinkage test of reinforced NC beams . Subsequently the long term creep and shrinkage test of UHPC specimens was conducted with stress to strength ratio of 20 30 and 40 respectively . Based on the test results and the CEB FIP Model code 1990 the simplified design formulas for predicting creep and shrinkage of UHPC were proposed respectively based on the developed UHPC material . In the proposed design formulas the final shrinkage strain was 145 and the final creep coefficient was 0.46 for the developed UHPC specimens based on the test environment condition . The comparison between the test result and proposed formulas indicated good applicability and accuracy of the proposed formulas . Based on the developed ABAQUS user subroutine and the proposed design formula for creep and shrinkage the finite element models of RC beam and UHPC beam were developed . The influence of creep and shrinkage on the long term mechanical behavior of simply supported prestressed beams were investigated . | The ABAQUS user subroutine for creep and shrinkage simulation was developed without recording stress history. The experimental study of the shrinkage and creep behavior of UHPC specimens was reported in detail. The simplified design methods for creep and shrinkage of UHPC was proposed with adequate accuracy. The FE model of the UHPC beam and RC beam were developed to simulate a prototype railway bridg. |
S1359836819334651 | The complementary hybridization of nanomaterials enables to realize newly synergistic properties which is a central concept in next generation widespread applications . In particular it is well established that the hybridization of ZnO nanostructure with zeolitic imidazolate framework 8 allows the improvement of gas selectivity owing to molecular sieving capability caused by inherently size defined porous structures of the ZIF 8 . Here we focused on a different viewpoint related with the preconcentration effect of ZIF 8 hybridized with ZnO nanowires array on NO | The hybridization of ZnO with zeolitic imidazolate framework 8 ZIF 8 was implemented. Morphological features of the ZIF 8 encapsulated in the ZnO NWs were optimized. The preconcentration and molecular sieving effects of ZIF 8 with ZnO NWs were explored. |
S1359836819335930 | New biodegradable trays based on cassava starch blended with sugarcane bagasse as the main component and cornhusk malt bagasse or orange bagasse have been investigated . Gelatinized cassava starch solution was used as binder . The resulting trays displayed thickness between 3.5050.18 and 3.9640.52mm and density between 0.1990.01 and 0.2130.02g cm | Trays containing sugarcane and malt or orange bagasse or cornhusk were prepared. All the biodegradable trays were more rigid than traditional EPS trays. Addition of 20 and 30 MB or OB produced less mechanically resistant trays. Trays stored under medium and high relative humidity had high water sorption. After analysis for 60 days trays with 20 or 30 OB were completely degraded. |
S1359836819336960 | Fibre reinforced composites have been increasingly used in the prefabricated building industry owing to its high strength to weight ratio ease of application and flexibility in manufacturing . FRCs can be used in PBs for both structural and non structural applications . The major hindrance for composite elements in PB is their fire performance . Depending on applications there will be different requirements for FRCs on the fire resistance and vertical flame spread . There is limited information available to structural and faade engineers designers on fire safety of FRCs especially for PBs . Therefore this paper provides the overview on the fire performance FRCs in PBs with a special focus on fibre reinforced polymer and textile reinforced concrete . | Fire performance of fibre reinforced composites FRCs. Structural and non structural application of FRCs in prefabricated building PB. Basis fire design requirements for PB. Potential research studies needed for fire safety of PB with FRCs elements |
S1359836819337084 | Metalorganic frameworks have come up as potential advance materials for energy applications owing to high surface area and tuneable porosity . The poor electrical conductivity and stability of MOFs restrict their vital use in supercapacitor applications . Herein a smart approach was employed to synthesize NiOx nanoparticles decorated with nitrogenous porous carbon | Recycling of waste PET plastic bottles to value added. composite. Very high specific surface area of 1523m. achieved for the first time. Excellent specific capacitance of 581.30F g at a scan rate of 5mV s. Excellent CV cyclic stability was obtained after a 5000 segments run. |
S1359836819338107 | A fire assessment model has been developed to provide a better understanding of the flame propagation toxic gases and smoke generations of polymer composites . In this study the effectiveness of the Chitosan Graphene Oxide layer by layer fire retardant coating on flexible polyurethane foam was investigated experimentally and numerically via Cone Calorimetry . To generate quality pyrolysis kinetics to enhance the accuracy of the model a systematic framework to extract TGA data is proposed involving the KissingerAkahiraSunose method followed by Genetic Algorithm with less than 5 of RMS error against experimental data . The proposed fire model is capable of predicting and visualising fire development and emitting gas volatiles . | Porous media surface regression pyrolysis model incorporating detailed chemistry. Advanced numerical genetic searching algorithm for pyrolysis kinetics extraction. Layer by layer assembly approach for fabrication of FPU GO CHT composites. Visualisation and prediction of flammability toxicity and smoke reductions. |
S1359836819338132 | Combating heavy metal pollution and energy crisis together while maintaining the green chemistry standard is a great challenge . Among heavy metals the toxicity of hexavalent chromium compounds is well known one which can be adsorbed from water and can be used as an electrode for energy storage . In this work a nanocomposite of exhausted activated carbon and polyaniline was used as an adsorbent for toxic Cr adsorption from mine water and a high performance asymmetric energy storage device was developed from it . Firstly the adsorbent was explored for the proficient removal of toxic Cr from water . The adsorption data was found to be well fitted with the Langmuir isotherm and the pseudo second order kinetics suggested the monolayer chemisorbed nature . In the next step the adsorbed material was investigated as the cathode material for supercapacitors . The nanocomposite based on Cr adsorbed material exhibited a high specific capacitance of 219.6F g at 1 A g current density and moderate cycling stability of 77 after 5000 charges discharge cycles . An asymmetric device developed using this hybrid material achieved an elevated energy density of 60.8Wh kg in organic electrolyte . The device was used to light up a strip of 43 red LEDs connected in parallel . | Cr VI removal from mine water by modified activated carbon based nanocomposite. Fabrication of asymmetric supercapacitor device by Waste to Wealth approach. Waste management and Development of Efficient Energy storage devices. |
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