Materials Literature
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Abstract The ignition–extinction behavior in the oxidation of methane, ethane, propane and isobutane, as well as of ethylene and propylene over a platinum‐foil catalyst was studied over the entire range of fuel/air ratios at atmospheric pressure. Ignition and extinction of the heterogeneous surface reaction, homogeneo…
Conventional ramp‐and‐hold sintering with a wide range of heating rates was conducted on submicrometer and nanocrystalline ZrO 2 –3 mol% Y 2 O 3 powder compacts. Although rapid heating rates have been reported to produce high density/fine grain size products for many submicrometer and smaller starting powders, the app…
Abstract The effect of acid type and concentration on the reaction rate and products of dissolution of hectorite in inorganic acids was investigated. The dissolution of hectorite in hydrochloric (HCl), nitric (HNO 3 ) and sulphuric (H 2 SO 4 ) acids was characterized using quantitative chemical analysis, infrared (IR)…
Abstract Copolyesters with different stoichiometric compositions, obtained from 1,4‐butanediol, adipic acid, and terephthalic acid by molten‐state polycondensation, are studied by means of high resolution 13 C NMR spectroscopy with respect to copolymer composition and block length distribution. The ratio of aliphatic…
[NH 2 (CH 3 ) 2 ] 3 Sb 2 Cl 9 (dimethylammonium nonachlorodiantimonate, DMACA) has, at 200 K, a monoclinic Pc space group, with a = 9.470 (3), b = 9.034 (3), c = 14.080 (4) Å, β = 95.81 (3)°, V = 1198.4 (4) Å 3 , Z = 2 [ R = 0.024, wR = 0.025 for 4613 independent reflections with F > 4 σ ( F )]. At 298 K DMACA has…
Titanium dioxide and zinc oxide films were fabricated by spin‐on and dip‐coating methods. Both types of films exhibited columnar grains when the single coating was thin, ∼10 nm. The columnar TiO 2 films were dense, as confirmed by their density values calculated from the refractive index and TEM results. The addition…
Poly(L-lactide) (PLLA) was molded into films and rods, and drawn in the longitudinal direction to endow them with piezoelectricity. The piezoelectric constants of PLLA films increased with the draw ratio and, after passing a maximum at a draw ratio around 5, decreased. PLLA samples with a draw ratio 5 underwent fibril…
This review describes the synthesis of 1,3- and 1,2-tetrachalcogenafulvalenes, the chemical transformation of substituents, reactions of the ring systems and the synthesis of polymers with 1,3-tetrathiafulvalene units in the backbone and in the side chain. For selected charge-transfer complexes of tetrachalcogenafulva…
Supercapacitors are now attracting much attention as battery‐complementary devices for applications requiring high operating power levels, such as in electric vehicle technology. Two types of supercapacitors with different modes of energy storage are currently under study: the double‐layer, and the redox. Electronical…
Sonoluminescence is explained in terms of quantum radiation by moving interfaces between media of different polarizability. In a stationary dielectric the zero-point fluctuations of the electromagnetic field excite virtual two-photon states, which become real under perturbation due to motion of the dielectric. The son…
protein superfamily of aminotransferases. specialized subdivisions of Family I within the Evolutionary recruitment of biochemically
Melting of NaCl and MgO has been simulated with a two-phase molecular dynamics method at constant pressure using newly developed interaction potentials. Equations of state for NaCl and MgO simulate ...
Relations between fracture toughness and fiber/matrix interphases were examined on various SiC/SiC composites made by chemical vapor infiltration (CVI) and reinforced with woven fiber bundles. Strong and weak fiber/matrix bondings were obtained using multilayered interphases consisting of various combinations of carbo…
Epoxy underfill is often required to enhance the reliability of flip-chip interconnects. This study evaluates the flow of typical epoxy underfill materials between parallel plates driven by capillary action. An exact model was developed to understand the functional relationship between flow distance, flow time, separa…
Rare earth oxide doped BaCeO 3 is known to exhibit high protonic conductivity in the temperature range 500 to 900°C and is a potential electrolyte for use in hydrogen sensing and fuel cell applications. Prior work, however, has shown that BaCeO 3 may be thermodynamically unstable at low temperatures. In the present wo…
The third-order nonlinear optical properties (second molecular hyperpolarizabilities, γ), of a series of organoboron compounds containing dimesitylboron moieties have been investigated by third harmonic generation (THG) measurements at 1.907 μm. Symmetric systems with B(mes)2 groups (mes=2,4,6–Me3C6H2) at both ends, e…
A synthetic porous three-dimensional structure that can mimic the architecture of actual tissues, provide sustained release of nutrients or growth factors, and serve as a template for cell seeding would be an ideal substrate for tissue engineering. Poly(l-lactic acid) (PLLA) foams were fabricated for this purpose, bas…
An electrophoretic deposition (EPD) method was applied for the preparation of yttria‐stabilized zirconia (YSZ) films for solid oxide fuel cell (SOFC) applications. Dense YSZ films with uniform thickness can be readily prepared with the EPD method by using acetylacetone or acetone as a solvent. The open‐circuit voltage…
For what is the first time, to our knowledge, we report on the extension of spectroscopic rotating-analyzer ellipsometry to generalized ellipsometry to define and to determine three essentially normalized elements of the optical Jones matrix J [ R. M. A. Azzam N. M. Bashara , J. Opt. Soc. Am.62, 1521 ( 1972)]. These e…
Sr‐ and Mg‐doped LaGaO 3 powders were prepared from a salt acetate solution. The stable solution was peptized by reacting ammonium hydroxide with the precursor solution. Thermal analysis (DTA/TGA) was used to characterize first the dehydration and then the thermal decomposition of the organic ligands of the dried gel.…