Materials Literature
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This paper describes the low temperature hydrothermal synthesis of y-Y2Si2O7 from a layered silicate (2 ∶ 1 clay), a precursor which acts as a structure-templating agent. Both the transformations undergone by the clay during the hydrothermal process and the new products formed at different reaction stages have been ch…
The synthesis and spectroscopic properties of some novel photochromic 3H-naphtho[2,1-b]pyrans are reported. Varying the size of an ortho-substituent on one of the geminal aryl rings allows the rate of fade of the photogenerated color to be controlled.
For the first time, in situ Raman and FTIR measurements have been carried out on a single bench-top instrument to characterize an alumina-supported palladium during the catalytic DeNOx reaction. While IR spectroscopy gives access to dedicated information on the NOx adsorbed species, Raman spectroscopy is highly sensit…
Polyurethanes are widely used as blood-contacting biomaterials due to their good biocompatibility and mechanical properties. Nevertheless, their blood compatibility is still not adequate for more demanding applications. Surface modification is an effective way to improve the hemocompatibility for biomaterials. The pur…
The chitosan-starch-sodium benzoate blend films were prepared by solution method, and then characterized by FT-IR, XRD, transmittancy, percent water absorption, measurement of mechanical properties and antimicrobial activity. The results suggested that there was some strong interaction and good compatibility in the bl…
It is well known that chromate conversion coatings (CCCs) exhibit a prompt loss in corrosion resistance when exposed to moderately elevated temperatures (60-100°C). They also suffer a gradual loss in corrosion resistance due to ambient temperature exposure. To better understand the origins of losses in corrosion resis…
Adherent polyaniline films on aluminum alloy 2024-T3 have been prepared by electrodeposition from aniline containing oxalic acid solution. The most appropriate method to prepare protective films was a successive galvanostatic deposition of 500 seconds. With this type of film, the open circuit potential of the coating…
Flash methods have become one of the most commonly used techniques for measuring the thermal diffusivity and thermal conductivity of various kinds of solids and liquids such as metals, carbon materials, ceramics, and polymers. Easy sample preparation, small sample dimensions, fast measurement times, and high accuracy…
Molybdenum doped vanadium pentoxide, (V1 − xMox)2O5, is considered to be a suitable model substance for the investigation of oxidation catalysts based on vanadium molydenum mixed oxides. Series of the doped oxide with 0 ≤ x ≤ 0.20 have been investigated by X-ray absorption spectroscopy and diffraction. The mean vanadi…
Hydrogen-charged miniaturized Charpy-type specimens were subjected to three-point bending tests to investigate an influence of phosphorus and boron on the hydrogen embrittlement (HE) susceptibility of high strength low alloy (HSLA) steels for bolts. The tests were carried out under wide variety of deformation rate to…
Determining how the vacancies in excess of equilibrium concentration are created and destroyed in solids is crucial for understanding many of their physical characteristics and processes. Grain boundaries are known to be sources and sinks for bulk vacancies, but the exchange that will occur between the grain boundary…
The use of fluoro substituents in liquid crystals has proved essential for the development of materials with optimised properties for advanced high technology devices. The small size and high polarity of a fluoro substituent can have some remarkable effects on the important physical properties of liquid crystals. Fluo…
The thermal conductivity and the temperature dependence of linear thermal expansion coefficient of Al4SiC4 sintered bodies were investigated from room temperature to 1200°C. Thermal conductivity decreased with the increase porosity. The thermal conductivity and linear expansion coefficient of highly densitied Al4SiC4…
Three high velocity joining methods are presented.They are projectile spot impact welding, electromagnetic crimping, and electromagnetic impact welding.Projectile spot impact welding utilizes high-speed bullet to impact metal sheets to a recessed die to achieve a solid state bonding.The bullet velocity ranges from 160…
Our exhaustive research on the preparation, characterization, materials properties and biodegradability of polylactide (PLA)/organically modified layered silicate (OMLS) nanocomposites has yielded results for PLA/montmorillonite (MMT) nanocomposites. Natural Na+-MMT modified with octadecylammonium cation, is used as a…
Four commercial non-ionic surfactant compounds, namely tween 80, 60, 40 and 20, were tested as inhibitors for corrosion of nickel in 1.0 M H 2 SO 4 solution. Weight loss measurements, potentiostatic polarization and cyclic voltammetry techniques were used in this study. It was found that all the four used compounds ac…
We have investigated atomic-scale effects of hydrogen atoms in α-Fe by means of ab-initio calculations and examined microscopic mechanism of hydrogen embrittlement in Fe-based materials. Our calculations indicate that accumulation of interstitial hydrogen in a tensile-stress-concentrated region ahead of a crack tip is…
Two signals have been observed in the ESR spectra of nanocrystalline MgO synthesized by an aerogel technique. These signals have been assigned to F+ centers in the nanocrystals and –O–˙CH2 radicals formed from residual methoxide groups present at the points of contact between the nanocrystals. The signal of F+ centers…
The etherification of glycerol with tert-butanol has been studied at the presence of catex Amberlyst 15 as catalyst. The maximum conversion of glycerol near 96% was reached at the temperature 90°C and at the molar ratio tert-butanol/glycerol = 4:1 after 180 min. Catalytic activity of Amberlyst 15 was compared with two…
A novel arylamine based hole transporting material (HTM) with tetraethylene glycol (TEG) side groups is reported. Lithium ions solubilised by the TEG groups are employed to modulate interfacial electron transfer reactions at a dye sensitised TiO2/HTM interface.