Materials Literature
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(18)O isotope labelling studies of the CO oxidation-assisted epoxidation of propene, catalyzed by a mixture of Au/TiO(2) and TS-1, using a methanol-H(2)O solvent showed the O in the epoxide was exclusively from O(2) and not H(2)O or methanol.
This paper presents the main thermoluminescence (TL) dosimetric characteristics of commercial Turkish transparent window glass. The structure of the glow curves, including the number of peaks, was found to be dose-dependent. A low-temperature glow peak that at 160 °C shifts to higher temperatures was also observed wit…
Despite their misleading label, rare events in stochastic systemsare central to many applied phenomena. In this paper, we concentrateon one such situation - phase separation through homogeneous nucleationin binary alloys as described by the stochastic partial differentialequation model due to Cahn, Hilliard, and Cook.…
BaTiO3 thin film has been deposited on Si(100) substrate using sol-gel process and deposited by using spin – coating technique. The BaTiO3/Si(100) structures were studied by structural and electrical characteristics. The X-ray diffrac-tion of BaTiO3/Si(100) shows that the diffraction peaks become increasing sharp with…
A recently developed voltammetric technique using a strongly alkaline electrolyte ( 6 M KOH + 1 M LiOH ) was successfully applied to clarify a corrosion mechanism of copper under atmospheric conditions. In contrast to conventional potentiometric methods with neutral or weak alkaline electrolytes (e.g., 0.1 M KCl), the…
We develop a kinetic theory of the biaxial phases for the bent-core or V-shaped liquid crystal polymer solution (VLCPS). The Brownian motion of the biaxial molecules, biaxial molecular excluded interaction, and the rotary convection are modeled explicitly. Using the hydrodynamic theory, we study the flow-driven orient…
The thermal crystallization behavior of bulk Se90−xTe10Cdx (x=0, 3, 9, and 15 at%) glasses was studied by differential thermal analysis, (DTA), under non-isothermal conditions. The glass transition temperature, (Tg), the onset crystallization temperature, (Tc), and the peak temperature of crystallization, (Tp), were f…
We prepared two sets of model polyisoprene-poly(butylene oxide) (PI-b-PBO) and poly(ethylene-alt-propylene)-PBO (PEP-b-PBO) diblock copolymers (molecular weights: 20000 ∼ 60000 g/mol and polydispersity indices <1.1) through anionic polymerization and catalytic hydrogenation. The phase behavior was investigated by rheo…
Highly accurate prediction of material strength under a practical hydrogen environment and development of materials with minimal hydrogen effect are essential for safe use of hydrogen energy. Here, we estimated the relationship between grain boundary (GB) properties and GB cohesive energy under gaseous hydrogen enviro…
We report on the mechanism of porous silicon (PS) formation from two different fluorohydrogenate ionic liquids. At the first stage of the study, an unexpected formation of PS by the anodic polarization of n-Si in 1-ethyl-3-methylimidazolium occurred without illumination. X-ray photoelectron spectroscopy studies show t…
Temperature swing NOx adsorption–desorption cycles with gas mixtures consisting of 1000 ppm NOx, 5% O2, 3% H2O and N2 were carried out on heteropolyacid adsorbents in the temperature range 80–170 °C. Keggin type heteropolyacids having tungsten, molybdenum or their combination in octahedral coordination in combination…
The aim of this study was to fabricate deformable chitosan (CS) microspheres for arterial embolization. CS microspheres containing poly(ethylene glycol) (PEG) were prepared by ionotropic gelation; PEG was then removed from the CS microspheres to produce the highly porous structure to allow deformability. The porosity…
Novel hybrid materials are synthesized through the surface selective grafting of poly-L-lysine and thiols from SBA-15.
This review deals with the main physico-chemical and interfacial processes, related to adhesion, that occur during textile manufacturing from raw material to the different final end-products. As regards the possible interfaces (solid/gas, solid/liquid and solid/solid), a number of considerations should be borne in min…
A new design strategy for solid single-component organic ferroelectrics and pyroelectrics has been developed. The subject is based on five-ring bent-core compounds which have the chemical structure typical for banana-shaped liquid crystals, however, they do not form liquid crystalline phases. Starting from a parent co…
Through a facile low-temperature solution process, vertically n-type ZnO nanorod arrays were grown on a GaN film to form a n-ZnO nanorod/p-GaN film heterojunction. A study of the electroluminescence (EL) characteristics of the heterojunction in air and in air with 2000 ppm hydrogen revealed the sensitivity of such a d…
High-dispersion-treated carbon nanofibers (CNFs) were used to fabricate uniformly-dispersed CNFs-alumina composites with enhanced mechanical properties. The treatment was effective in obtaining dense and uniform composites. The composites containing 0.4–0.8 wt % CNFs were densified to a relative density of more than 9…
Hybrid solar cells employing conjugated polymers have revolutionized the photovoltaic industry by offering the prospect for large-scale energy conversion applications through cost-effective fabrication techniques. In this regard, we have demonstrated an experimental approach to fabricate polypyrrole/ZnCoO nanorod hybr…
Thermoelectric properties of combustion synthesized and spark plasma sintered rare-earth-doped (La, Sm, Gd, Dy and Y) SrTiO3 was investigated from room temperature to 870 K from viewpoint of energy and time saving without deterioration in thermoelectric properties. All single phases of rare-earth-doped SrTiO3 were suc…
Recently derived vibrational spectroscopic data from NO ligands in metal coordination or cluster compounds, corrected to 'neutral coligand' status, are used to help identify the structures of related surface species from NO chemisorbed on metal single-crystal surfaces at low coverage. The derived conclusions form the…