Materials Literature
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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…
Abstract Mesoporous polymer particles (MPPs) have been synthesized by using the spherical microparticles of siliceous mesocellular foam (MCF) as a hard template. The MPPs possessed a robust structure with ultralarge mesopores, and a clean and inert surface. The surface properties of the MPPs could be tailored for vari…
In the last few decades, the synthesis and catalytic application of nanoscaled particles prepared from Group 8-10 (formerly Group VIIIB) elements have been widely explored and have achieved promising results. The innovative use of these nanoparticle catalysts may provide new opportunities in the efficient combination…
Plasma-enhanced chemical vapor-deposited SiO2 and SiNx were used to passivate ZnO heterojunction light emitting diodes (LEDs). Postdielectric deposition annealing was critical in obtaining good LED electrical and optical characteristics. No diode characteristics or light emission was observed unless the structures wer…
We report the breakdown behavior of a patterned Ge2Sb2Te5 multiline structure during the voltage-driven electric stress biasing. Scanning Auger microscope analysis shows that the breakdown process accompanies with a phase separation of Ge2Sb2Te5 into an Sb, Te-rich phase and a Ge-rich phase. The phase separation is ex…
The loadability of a pulp refiner was studied using refiner data such as gap movement, total power, no-load power, and net refining power. Two different types of pulp and three different types of refiner filling were used in the study. The floc formation and floc size of each pulp was studied in a flow channel simulat…
A simple and unified model is developed to predict the effective phonon mean free path (MFP) of semiconductor nanostructures based on Casimir’s work [Physica (Amsterdam) 5, 495 (1938)]. The effective MFP of nanofilms is found to be larger than that of nanowires, where the Casimir limit for nanofilms equals twice its t…
Abstract The flame retardation of polypropylene (PP) composites containing melamine phosphate (MP) and pentaerythritol phosphate (PEPA) was characterized by limiting oxygen index (LOI) and UL 94. The morphology of the char obtained from the combustion of the composites was studied by scanning electron microscopy (SEM)…