Materials Literature
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X-ray absorption measurements of solid and liquid AgBr in the $T=30--927K$ range of temperature have been performed using synchrotron radiation. Accurate short-range structural parameters are determined using simultaneous Ag and Br K-edge EXAFS refinement in the framework of the GNXAS method for data analysis. Results…
The salient features of the current burst model for the Si–electrolyte interface is presented in a short overview. In the current burst model, charge transfer at the Si–electrolyte interface is localized in space and time and intrinsically stochastic; all phenomena encountered in Si electrochemistry then are manifesta…
Nanostructured carbon/silica hybrid materials and poly(furfuryl alcohol)/silica xerogel are prepared and characterized here. In the key synthetic step, cation-induced polycondensation of furfuryl alcohol occurs simultaneously with a sol–gel process involving tetraethoxysilane and water to yield the xerogel, which is s…
ABSTRACT Batch extraction of zein from dry‐milled whole corn with ethanol was optimum with 70% ethanol in water, an extraction time of 30–40 min, and temperature of 50°C. High yields (60% of the zein in corn) and high zein contents in the extracted solids (50%) were obtained at a solvent‐to‐solids ratio of 8 mL of 70%…
ADVERTISEMENT RETURN TO ISSUECommunicationNEXTAqueous Preparation of Highly Dispersed Molybdenum SulfideI. Bezverkhy, P. Afanasiev, and M. LacroixView Author Information Institut de Recherches sur la Catalyse, 2, Avenue Albert Einstein, 69626 Villeurbanne Cedex, France Cite this: Inorg. Chem. 2000, 39, 24, 5416–5417Pu…
The edema factor exotoxin produced by Bacillus anthracis is an adenylyl cyclase that is activated by calmodulin (CaM) at resting state calcium concentrations in infected cells. A C-terminal 60-kDa fragment corresponding to the catalytic domain of edema factor (EF3) was cloned, overexpressed in Escherichia coli, and pu…
The formation of coils is common in nature when achiral symmetry breaking occurs. Here we describe spectacular examples of single, double and triple coils observed in smectic liquid crystal phases of achiral banana-shaped molecules. Such molecules form chiral smectic phases due to two symmetry-breaking instabilities:…
Raman scattering from individual single-wall carbon nanotube (SWNT) bundles was measured using confocal optical microscopy with 632 nm laser excitation. The Raman scattering from metallic SWNTs was found to depend sensitively on adsorbed oxidizing molecules. Tangential mode Raman lines of HNO 3 -treated SWNTs exhibite…
A new efficient laboratory method of preparation of chlorodimethylsilane (Cl(CH 3 ) 2 SiH) has been elaborated, which is a modification of the Eaborn et al. method (34) and is based on a transsilylation reaction of substituted (amino)dimethylhydrosilanes, R 2 NSiMe 2 H (R 2 = Me 2 , Et 2 , (CH 2 ) n , etc.) with dimet…
Three composites that were 96% alumina were mixed and uniaxially dry‐pressed into bars and pellets; all had monoclinic SrAl 2 Si 2 O 8 as an intergranular phase. The diffraction patterns, microstructure, density, dielectric properties, strength, and toughness were measured. The first composition, which contained cryst…
A series of copolyimides were prepared from two alicyclic dianhydrides having the common molecular formula C10H8O6, rel-[1S,5R,6R]-3-oxabicyclo[3.2.1]octane-2,4-dione-6-spiro-3′-(tetrahydrofuran-2′,5′-dione) (DAn) and c-3-carboxymethyl-r-1,c-2,c-4-cyclopentanetricarboxylic acid 1,4:2,3-dianhydride (TCAAH), with p-phen…
The introduction of a ceramic gas turbine component in commercial power generation service will require significant effort. A careful assessment of the power plant performance benefit achievable from the use of ceramic components is necessary to rationalize the priority of this development compared to other alternativ…
Polyurethane flexible foam materials have a wide range of industrial applications. These applications include flexible foams for packaging, polyurethane-based foam materials for seat cushions in buses, railways, the airline industry, prisons, and domestic bedding. There is a substantial need for the development of fle…
Copper oxide supported on MgO was prepared by the wet impregnation method using basic magnesium carbonate and copper nitrate. Thus, a known weight of basic magnesium carbonate was treated with a known amount of copper nitrate dissolved in the least amount of distilled water necessary to make a paste. The paste was dri…
A high-concentration ozone generator operating at atmospheric pressure was developed to produce ozone for use in fabrication of ultrathin silicon oxide films. A technique for adsorption onto silica gel, in which ozone has adsorption priority over oxygen, was adopted to obtain concentrated ozone. An ozone–oxygen mixtur…
The influence of quasihydrostatic pressure on the electrical transport in epitaxial La0.7Ca0.3MnO3/MgO(100) thin films prepared by pulsed laser deposition (PLD) and metalorganic aerosol deposition (MAD) was studied for temperatures T=4.2–300 K and magnetic fields B=0–12 T. Usual or “intrinsic” pressure effect, charact…
Low density, high modulus, and potentially improved wear resistance are the major benefits of a ferrous composite material. A BS S.156 (4%NiCrMo)gear steel reinforced with 15 vol.-% titanium diboride particles has been demonstrated for possible high performance structural applications. This composite has been produced…
Susceptibility to intergranular attack (IGA) and intergranular stress corrosion cracking (IGSCC) of Alloy 690 (UNS N06690) was investigated using chemical etching, double-loop electrochemical potentiokinetic reactivation (DL-EPR), and slow strain rate tests. Alloy 690 was solution-annealed at 1,100°C for 30 min, water…
Microwave losses due to conductivity and magnetic permeability are investigated in ${\mathrm{La}}_{0.9}{\mathrm{Ca}}_{0.1}{\mathrm{MnO}}_{3}$ films illuminated with photons in the energy range of $E=0.5--2\mathrm{eV}.$ Growth of photoinduced ferromagnetic hysteresis is observed when the magnetic field is swept between…
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