Materials Literature
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α-Ti foil with a protective layer formed on one side was deflected as a result of corrosion in a methanol (CH3OH) solution containing 0.6 mol/L potassium chloride (KCl) because of tensile stresses generated at or near the metal passive film interface. Transmission electron microscopy (TEM) observations showed that the…
Mechanical parameters such as bending rigidity, thickness, compressibility, and coef ficient of friction are measured by a sensory method for a series of plain and rib weft knitted structures made from cashmere and polyester textured yarns. The values estimated by the sensory method are found to be in fairly good agre…
The mechanism of immersion plating of copper on porous silicon is studied. Copper metal is deposited on the surface of porous silicon at a rest potential in aqueous solution. It is shown that presence of chloride ions in copper sulfate solution inhibits the metal deposition, whereas the deposition is possible in cupro…
Microcellular ABS foams are a novel family of materials with the potential to significantly reduce material costs in a number of applications that currently use solid polymer. ABS foams were produced using carbon dioxide in a solid-state process. Solubility and diffusivity of CO 2 in ABS was measured, and the latter w…
Silk fine powder was prepared directly from silk fibers irradiated with an accelerated electron beam (EB). Irradiated silk fibers were well pulverized only by physical crushing using a ball mill without any chemical pretreatment. Silk fibroin fibers were irradiated at ambient temperature in the dose range of 250–1 000…
Abstract The mechanism for the photooxidation of NO over hydrogen plasma-treated TiO2 under visible light irradiation was studied by in situ Fourier transform infrared spectroscopy. It was found that the oxidation of NO over plasma-treated TiO2 under visible light proceeded consecutively as NO → NO2− → NO3−, where the…
ABSTRACT: The kinetics of chlorophyll degradation in pea puree were determined in a specially designed reactor with on‐line pH control capability. Without pH control, the pH of the pea puree decreased continuously with heating due to acid formation; the pH was maintained within ±0.1 of the desired value with on‐line p…
A new azobenzene-containing side-on LC polymer was synthesized. It shows a nematic phase. Its photochemical properties were characterized in solution and in thin film. The N-I phase transition can be induced upon irradiation in the π-π* absorption region of the polymer.
An overview is given on the reduction by X-rays, of Au, Hg, Bl, V, and W metal ions during the XPS analysis of various kinds of samples. The possibility of correlating the ability of the metal ions to undergo X-ray induced reduction with their electrochemical reduction potentials is also highlighted.
Abstract Various linear low‐density polyethylene (LLDPE; density ∼ (0.920 g/cm 3 )) resins that encompass those polymerized using Ziegler‐Natta, metallocene, and chromium oxide based catalysts were blown into film at similar process conditions, and the tensile properties of the resulting films were investigated in rel…
The thermodynamics of cation ordering in the ilmenite-hematite solid solution (FeTiO 3 )x(Fe 2 O 3 )1-x were re-examined in view of a recent in-situ neutron diffraction study of the R3̅ to R3̅ phase transition. A macroscopic thermodynamic model is developed, in which the excess enthalpy of ordering is described by a f…
Aliphatic [n]-polyurethanes were obtained by catalytic polycondensation of suitable α-hydroxy-ω-O-phenyl urethanes (III). 1H and 13C NMR analyses of the resulting [n]-polyurethanes (3 a–g) show a uniform microstructure consisting of urethane groups only, and with carbonate and urea groups being absent. The [n]-polyure…
Linear response density functional calculations of the structures, phonon spectra, and thermal expansion have been performed for the hexagonal silicate \ensuremath{\beta}-eucryptite $[\ensuremath{\beta}\ensuremath{-}{\mathrm{LiAlSiO}}_{4}]$ and related materials, extending and refining earlier work using direct diagon…
High-voltage on-site tests of extruded insulation cables are necessary to check the quality of the installation of the system. The test voltage should simulate the stress under service conditions, and generate the same failure mechanism. With respect to an optimum design of test systems, a frequency range of 20 to 300…
Silicon carbide with aluminum, boron, and carbon additions (ABC‐SiC) was hot‐pressed to full density. The samples were examined by transmission electron microscopy (TEM), with an emphasis on high‐resolution electron microscopy (HREM). Amorphous grain boundary interlayers, typically less than 2 nm wide, were formed bet…
Membranes made from 4 commercial poly(carbonate urethanes): Carbothane (CB), Chronoflex (CF), Corethane 80A (CT80), and Corethane 55D (CT55), and from 2 poly(ether urethanes): Tecoflex (TF) and Tecothane (TT) were prepared by solution casting and sterilized by either ethylene oxide (EO) or gamma radiation. Their bioco…
Nonrandom porous mullite ceramics with controlled pore geometry have been fabricated using a lost mold process, where the molds were fabricated using the fused deposition process from CAD data. The pore geometry of molds was varied to achieve different pore sizes and shapes. These porous ceramic structures were then t…
Ultrafine grained (∼1 µm) steels are currently the subject of a great deal of research worldwide. They offer the prospect of very high strength with very high toughness from standard steel compositions, and recently it has been shown that such fine grains can be obtained from the hot rolling mill rather than merely fr…
Rough silver surfaces enhance the Raman scattering of adsorbed molecules by many orders of magnitude. The size, shape, and surroundings of the metal particles greatly influence the resulting Raman intensities. With the controlled formation of well-separated silver islands, direct investigation of the local origin of t…
The high-$T$ ``orthorhombic-cubic'' Jahn-Teller (JT) transition of a polycrystalline sample of ${\mathrm{LaMnO}}_{3}$ is studied by Raman scattering. A ${\mathrm{CaMnO}}_{3}$ ceramic sample is used as a reference compound. Dramatic broadening of the ${\mathrm{LaMnO}}_{3}$ Raman modes are observed as T approaches the J…