Materials Literature
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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…
Abstract Nanocomposites of polyethylene (HDPE) and poly(ethylene‐ co ‐1‐octene) thermoplastic elastomers, both containing boehmites with variable sizes, shapes, and aspect ratios (1–20), were prepared by means of in situ olefin polymerization and melt compounding. The in situ olefin polymerization in the presence of b…
Composites of alumina (Al2O3) ceramic and single-wall carbon nanotubes (SWNTs) have been tested in uniaxial compression at 1300 and 1350°C (Ar atmosphere), and they have been found to be about two orders of magnitude more creep-resistant compared to a pure alumina of about the same grain size (0.5μm). This is attribut…
Animal, mineral, and/or vegetable: Ordered porous carbon fibers with hierarchical morphology (see electron microscopy images) have been prepared from collagen fiber, an abundant biomass, by treatment with metal ions and vegetable tannin or glutaraldehyde. The pore size of the carbon fibers thus obtained can be control…
As the magnetization rotates in the (001) plane of epitaxial (Ga,Mn)As films, we observe both two- and fourfold oscillations of comparable magnitude in the longitudinal resistivity. This behavior is different from the usual anisotropic magnetoresistance effect in polycrystalline films. The fourfold or cubic symmetry v…
A two-dimensional electromagnetic cloak recipe having a uniform thickness is presented for cloaked regions of elliptic cylindrical shape. The cloak material parameters are obtained from the spatial transformation approach. The effectiveness of the cloak design is verified by full-wave simulations of plane wave scatter…
Epitaxial n-ZnO∕MgO∕TiN∕n+-Si heterostructured light-emitting diodes have been fabricated. The epitaxial growth of MgO∕TiN on Si(111) was established by pulsed laser deposition, which was further employed as a buffer layer for epitaxial growth of ZnO layer by metal-organic chemical-vapor deposition. Good epitaxial qua…
High-quality biaxial single crystals of chalcone derivatives were grown by solution growth technique. Their molecular structures were designed to possess large second-order nonlinearities by choosing proper donor/acceptor groups while retaining a high transparency in the visible and infrared spectral regions. The seco…