Materials Literature
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Abstract The impact fracture mechanisms of polypropylene (PP), containing 9.2 vol % of calcium carbonate (CaCO 3 ) nanoparticles, were investigated using optical microscopy and transmission electron microscopy. The incorporation of CaCO 3 nanoparticles reduces the size of spherulites and induces the formation of β‐pha…
We study the structure of very thin liquid crystal films frustrated by antagonistic anchorings in the smectic phase. In a cylindrical geometry, the structure is dominated by the defects for film thicknesses smaller than 150 nm and the detailed topology of the defects' cores can be revealed by x-ray diffraction. They a…
A new mesoporous sphere-like SBA-15 silica was synthesized and evaluated in terms of its suitability as stationary phases for CEC. The unique and attractive properties of the silica particle are its submicrometer particle size of 400 nm and highly ordered cylindrical mesopores with uniform pore size of 12 nm running a…
Abstract Polypyrrole samples that have been prepared in a conducting state by a chemical method using two different oxidizing agents, ferric chloride and potassium persulphate, in different concentrations have been transformed to a dielectric state by heating at 333 K for 7 days and then at 353 K for 4 days more. Then…
Abstract Rubber‐toughened polypropylene (PP)/org‐Montmorillonite (org‐MMT) nanocomposite with polyethylene octene (POE) copolymer were compounded in a twin‐screw extruder at 230°C and injection‐molded. The POE used had 25 wt % 1‐octene content and the weight fraction of POE in the blend was varied in the range of 0–20…
We calculate Curie temperatures and study the stability of ferromagnetism in diluted magnetic materials, taking as a model for the exchange between magnetic impurities a damped Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction and a short-range term representing the effects of superexchange. To properly include effects…
We report on the theoretical investigations into the recently discovered colossal entropy change in MnAs under magnetic-field change in an isothermal process. The phenomenological model takes into account the exchange-Zeeman interactions, magnetoelastic interactions, the external pressure effect, and the magnetic-fiel…
Abstract In this article, maleated–grafted ethylene‐ co ‐vinyl acetate (EVA‐ g ‐MA) was used as the interfacial modifier for polypropylene/polyamide‐6 (PP/PA6) blends, and effects of its concentration on the mechanical properties and the morphology of blends were investigated. It was found that the addition of EVA‐ g…
Abstract The presence of Mg 2+ ions was found to be a major cause of destabilization of natural rubber (NR) latex. On the other hand, the addition of excess PO ions to remove Mg 2+ ions could adversely affect the physical properties of dipped products made of NR latex. A series of concentrated latex samples were treat…
Abstract Rubber toughening of polyamide 6 (PA6)/layered‐silicate nanocomposites was investigated. Different systems were prepared via melt blending according to different formulations. Wide‐angle X‐ray diffraction and transmission electron microscopy analyses showed that the nanocomposites had an appreciable degree of…
Abstract Numerical simulations of time-dependent energy transport in semiconductor thin films are performed using the lattice Boltzmann method applied to phonon transport. The discrete lattice Boltzmann method is derived from the continuous Boltzmann transport equation assuming first gray dispersion and then nonlinear…
Abstract The crystallization of submicrometer PA6 droplets dispersed in an ethylene‐1‐octene copolymer matrix, using PE‐ g ‐MA as a compatibilizer agent, is investigated. This system shows a nonconventional mechanical behavior at high temperatures. Up to ∼100 °C above the final melting temperature of the ethylene‐1‐oc…
Abstract Poly vinyl alcohol (PVA) incorporated with different weight percent of Silver nanoparticles (Ag NPs) were prepared. The enhancement factors for each band in the Raman spectra were calculated and the degree of enhancement were found to be increased as the percent of Ag NPs increases up to 0.3%, and thereafter…
SiO 2 nanotubes could be synthesized by hydrolysis of tetraethyl orthosilicate (TEOS) on the surface of carbon nanofibers (CNF), followed by removal of CNF. In the synthesis of SiO 2 nanotubes, CNF acted as templates. The wall thickness and the internal diameter of SiO 2 nanotubes were changed by hydrolysis time of TE…
The depletion of the world's petroleum reserves and the increased environmental impact of conventional combustion-engine-powered automobiles are leading to renewed interest in hydrogen storage materials. In the mid 1990s, Ti/Zr/Hf-based quasicrystals were demonstrated to store more hydrogen than competing crystal inte…
We present an experimental and theoretical study of the shape of fragments generated by explosive and impact loading of closed shells. Based on high speed imaging, we have determined the fragmentation mechanism of shells. Experiments have shown that the fragments vary from completely isotropic to highly anisotropic el…
A theoretical study of [001] ``double-exchange'' superlattices is presented. The superlattice is defined in terms of an $AB{\mathrm{O}}_{3}$ perovskite crystal. Itinerant electrons hop among the $B$ sites according to a nearest-neighbor tight binding model and are coupled to classical ``core spins.'' The $A$ sites con…
We have performed first-principle calculations of the electronic structure and exchange couplings for the nanotube compound ${\mathrm{Na}}_{2}{\mathrm{V}}_{3}{\mathrm{O}}_{7}$ using the local-density approximation Hubbard parameter $U$ approach. Our results show that while the intraring exchange interactions are mainl…
BACKGROUND: Magnetite cationic liposomes (MCLs) can be used to induce hyperthermia because they generate heat in an alternating magnetic field (AMF). This study aimed at developing more practical method for MCL hyperthermia examining the effect of MCL-induced hyperthermia on human prostate cancer in vivo. MATERIALS AN…
We present calculations of the density distributions and contact angles of liquid droplets on roughened solid surfaces for a lattice gas model solved in a mean-field approximation. For the case of a smooth surface, this approach yields contact angles that are well described by Young's equation. We consider rough surfa…