Materials Literature
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Abstract Binary polyamide 66 nanocomposites containing 2 wt % organoclay, polyamide 66 blend containing 5 wt % impact modifier, and ternary polyamide 66 nanocomposites containing 2 wt % organoclay and 5 wt % impact modifier were prepared by melt compounding method. The effects of E‐GMA and the types of the organoclays…
Abstract In the present study, the effect of gamma and electron beam (EB) irradiation on the thermal and mechanical properties of high crystalline polypropylene (HPP) was studied. To study the structural modifications of HPP polymer which could occur following these treatments at different doses (20, 40, 60, 80, 100,…
The structures of eight related known intermetallic structure types are the impetus to this paper: Li21Si5, Mg44Rh7, Zn13(Fe,Ni)2, Mg6Pd, Na6Tl, Zn91Ir11, Li13Na29Ba19, and Al69Ta39. All belong to the F43m space group, have roughly 400 atoms in their cubic unit cells, are built up at least partially from the gamma-bra…
The effects of polygermanium interlayer, acting mainly as heating and thermal-resisting one, on performance of phase change memory are studied. Thermal simulation shows that the maximum temperature in Ge2Sb2Te5 layer is remarkably promoted when Ge2Sb2Te5 is capped between polygermanium layers. The maximum temperature…
Abstract The mineral wheatleyite has been synthesised and characterised by Raman spectroscopy complimented with infrared spectroscopy. Two Raman bands at 1434 and 1470 cm −1 are assigned to the ν (CO) stretching mode and implies two independent oxalate anions. Two intense Raman bands observed at 904 and 860 cm −1 are…
Abstract ZrO 2 ‐Al 2 O 3 Bragg reflectors for future application in ZnO based resonators grown by pulsed laser deposition on c‐plane sapphire and silicon substrates show a reflectivity up to 99.8% with a layer pair number of 12.5. Layer thicknesses obtained from standard ellipsometry agree very well with thicknesses o…
Abstract In‐situ spectroscopic ellipsometry was used to evaluate the temperature behaviour of chitin and chitosan thin films. For both biopolymers it was found that film thickness decreases with temperature. Two different linear rates were clearly identified by a characteristic temperature T c , of 51 and 59 °C for ch…
Abstract A diamine containing a pendant phenoxy group, 1‐phenoxy‐2,4‐diaminobenzene, was synthesized and condensed with different aromatic dianhydrides [4,4′‐oxydiphthalic dianhydride, 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride, 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride, 3,3′,4,4′‐biphenyltetracorbox…
Keggin-type heteropolyacids have been used as catalyst for high-yielding oxidation reactions in multiphase conditions. This simple and efficient procedure promoted the conversion of anilines to the corresponding nitroso and nitro derivatives. In comparison with homogeneous system the oxidation from anilines to nitroso…
Abstract The effect of silica reinforcement was studied for natural rubber (NR) and butadiene rubber (BR) vulcanizates by a sol–gel reaction with tetraethoxysilane at different temperatures. The formation of silica in the rubber vulcanizates was investigated analytically with Fourier transform infrared spectroscopy an…
We report microphotoluminescence measurements on individually suspended ZnO nanowires attached to nanometer-sized metal tips. This procedure avoids the possible influence of the substrate and enables comprehensive optical, electrical, chemical, and morphological characterizations to be carried on the same individual n…
The best level of ordering and straightening of carbon nanotube arrays is often achieved when they are grown in a dielectric matrix, so such structures present the most suitable candidates for future channeling experiments with carbon nanotubes. Consequently, we investigate here how the dynamic polarization of carbon…
Abstract All of the composites were prepared using Brabender internal mixer (50 rpm, 190°C) and molded using compression mold (190°C) to form test samples. The results showed that the tendency of kaolin particles to agglomerate was too strong, resulting in low strength and rigidity but fairly good toughness. To overco…
Abstract The prism minimum deviation technique has been used to measure the fluid dependence of refractive indices. Fluids with varying ion concentration (0 to 1.0 M) and varying protein concentration (0.01‐10 mg/ml) have been examined and the measurements show that these parameters influence the refractive index valu…
Abstract Styrene and 4‐vinylbenzocyclobutene (vinyl‐BCB) random copolymers were prepared by free radical polymerization and studied for suitability as a dielectric material for microelectronic applications. The percentage of vinyl‐BCB in the copolymer was varied from 0 to 26 mol % to optimize the physical and mechanic…
Abstract A polymer nanocomposite was produced by acrylonitrile‐butadiene‐styrene (ABS) and α‐alumina was prepared through sol‐gel process using aluminum nitrate and citric acid. The particle size was analyzed by X‐ray diffraction and scanning electron microscopy (SEM) studies. The nanocomposites were characterized thr…
Abstract A new controllable approach to synthesize hyperbranched poly(siloxysilanes) via hydrosilylation of A 2 ‐ and B′B x ‐type monomers was developed in this work. A 2 monomers (dimethylbis(dimethylsiloxy)siloxane and tetramethyldisiloxane), B′B x monomers (methylvinyldiallylsilane and vinyltriallylsilane), and the…
In this work the sol-gel process was used to prepare Ce-doped yttrium aluminium garnet (Y 3 A l 5 O 12, YAG) samples. The synthesis products were characterized by infrared spectroscopy (IR), X-ray powder diffraction analysis (XRD), and transmission electron microscopy (TEM). The particle size and luminescence properti…
The ferroelectric domain ground state of PbTiO3 thin films on Nb:SrTiO3 substrates has been studied as a function of film thickness. High resolution linear Qx x-ray diffraction profiles were recorded in order to probe the presence of stripe domains, which were invariably observed for as-grown samples. After photochemi…
The effect of repeated conditioning procedures (25 runs), consisting of soiling (milk and meat products) and cleaning steps, on the hygienic status, physico-chemical properties and surface chemical composition of stainless steel (SS) surfaces, was investigated. Five SSs differing in grade and finish were used. Both so…