Materials Literature
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Abstract Mechanical and Morphological properties of polyamide‐6/ABS blend systems, compatibilized by styrene‐maleic anhydride (SMA) copolymer, have been studied. The strength, modulus, and impact properties improved upon the addition of SMA. Morphological studies, using small angle light scattering, polarizing microsc…
Copper films have been deposited by low pressure chemical vapor deposition from mixtures of the Cu+1 precursor copper hexafluoroacetylacetonate vinyltrimethylsilane and water vapor. The addition of water vapor at the optimum concentration more than doubles the deposition rate and substantially reduces the nucleation t…
Nanocrystalline BaTiO3 thin-layer capacitors were integrated onto silicon by sol-gel processing using alkoxide precursor solutions. 200-nm-thick layers were formed and found to be comprised of 25-nm grains in the cubic perovskite structure. Electrical measurements indicated a lack of polarization-reversal hysteresis c…
Abstract Thermooxidative degradation of thick‐walled rubber materials is dependent on oxygen diffusion. The oxidative degradation ceases due to a lower permeability of oxygen through the oxidized material formed at the rubber surface. This phenomenon indicates a paradoxical effect of antioxidant loading. Since antioxi…
Lead(II) oxalate dihydrate, PbC 2 O 4 .2H 2 O, has a polymeric structure. The channels formed by Pb 2+ and oxalate ions are elongated along [001]. Within the channels there are water molecules of two sorts: (a) water weakly coordinated to lead ions and (b) water of crystallization
Although Debye's relaxation model has been extensively used in analyzing experimental data of dielectric dispersion and absorption, the model has a fault to violate the sum rule for dielectric function. A simple and tractable modification to Debye's model is proposed which is free from the above-mentioned fault. The r…
Michael Rezsutek, Guy N. Cameron; Mormoops megalophylla, Mammalian Species, Issue 448, 15 November 1993, Pages 1–5, https://doi.org/10.2307/3504289
Quantitative low-energy electron-diffraction (LEED) IV spectra analyses of Ag, Li, and metastable clean (\ensuremath{\surd}3 \ifmmode\times\else\texttimes\fi{} \ensuremath{\surd}3 )R30 \ifmmode^\circ\else\textdegree\fi{} Si(111) reveal that striking similarities in the LEED spectra are due to common scattering blocks…
Reconstructed surfaces on Sb/GaAs(001) have been investigated in situ by reflection high-energy electron diffraction (RHEED) and core-level photoelectron spectroscopy by heating a sample prepared by depositing Sb on an As-terminated GaAs(001) surface at room temperature (RT). Before Sb desorption, the halo RHEED patte…
Melts of Ag, Cu, and four different Ag-Cu alloys, including the eutectic composition, with masses between 1 and 2.5 g were undercooled by the glass flux method, and the temperature of the specimen was measured with a pyrometer during cooling and recalescence. For each composition the maximum recalescence rate was dete…
The local structural order in chalcogenide network glasses is known to change markedly at two critical compositions, namely, the percolation and chemical thresholds. In the ${\mathrm{As}}_{\mathit{x}}$${\mathrm{Te}}_{100\mathrm{\ensuremath{-}}\mathit{x}}$ glassy system, both the thresholds coincide at the composition…
Detailed computer simulation results of several static and dynamical properties of water, obtained by using a realistic potential model proposed by Jorgensen et al., in the supercooled region, at densities well below the coexistence curve, are reported. We have analyzed the structural properties by evaluating the volu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical structure, optical resonance, and surface-enhanced Raman scattering of silver-island films on suspended polymer latex particlesPaula A. Schueler, Jeffrey T. Ives, Fern. DeLaCroix, William B. Lacy, Patricia A. Becker, Jianmin. Li, Karin D. Caldwell, Barney. Drake, an…
Experimental observation of the ground-state biexciton transition in ${\mathrm{CdS}}_{\mathit{x}}$${\mathrm{Se}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$ quantum dots in glass is presented in a three-beam experiment, involving a probe, a pump, and a saturating laser pulse. The observed quantum-dot biexciton ground state…
We have investigated the electronic structure of well-characterized samples of ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{FeO}}_{3}$ (x=0.0--0.4) by x-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy, bremsstrahlung isochromat (BI) spectroscopy…
Abstract Three series of polyether polyurethaneurea (PEUU) elastomers based on poly(tetramethylene glycol) (PTMG, MW = 1000 or 2000), 4,4′‐diphenylmethane diisocyanate (MDI), and three kinds of diamine chain extenders, i.e., 4,4′‐diaminodiphenylmethane (DAM), m ‐phenylenediamine (MPD), and p ‐phenylenediamine (PPD) we…
Thin film reactions of Cu/Al multilayer films were investigated by differential scanning calorimetry and transmission electron microscopy. Sequential intermetallic compound formation was found in the temperature range from 300 to 620 K. With excess copper present in the as-deposited trilayer and multilayer films, the…
The temperature dependence of the thermoelectric power was investigated for the emeraldine salt form of polyaniline protonated with camphor sulfonic acid (PANI-CSA) and for blends of PANI-CSA with poly(methyl methacrylate) (PANI-CSA/PMMA). The thermoelectric power (S) of PANI-CSA increases linearly in proportion to th…
Abstract The amount of research on lignocellulosic/thermoplastic composites has increased dramatically. Little attention, however, has been directed towards the subject of crystallinity at the interface (interphase). Optical microscopy and differential scanning calorimetry were used in this work to study crystallinity…
First-order Raman scattering of polycrystalline ${\mathrm{Ge}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Si}}_{\mathit{x}}$ alloys is studied from T=300--900 K. The Raman shifts of the three optical phonons are modeled by considering thermal expansion and coupling to two phonons. The shift of the Si-Si mode near…