Materials Literature
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The optical and structural properties of porous Si films produced by electrochemical and chemical dissolution of Si have been studied by a variety of techniques. Raman scattering and transmission electron microscopy have shown the samples to contain crystalline Si wires and (or) spherites 3–8 nm in diameter and (or) a…
The influence of strain rate and yarn number on tensile test results is investigated using a model to describe the tensile curve. A good correlation is obtained with the experimental stress-strain curves. The influence of the yarn number on the tensile modulus and the tensile curve is not quite the same for ring and r…
Gadolinium (4s)-4-(4-ethoxybenzyl-3,6,9-tris(carboxylato-methyl)-3,6,9- triazaudecandioic acid (EOB) diethylenetriaminepentaacetic acid (DTPA), a hepatocellular-directed magnetic resonance (MR) contrast agent, and coated superparamagnetic iron oxide particles (SPIO), a Kupffer cell-directed contrast agent, were compar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer spectroscopy and magnetization studies of .alpha.- and .beta.-ruthenium trichlorideY. Kobayashi, T. Okada, K. Asai, M. Katada, H. Sano, and F. AmbeCite this: Inorg. Chem. 1992, 31, 22, 4570–4574Publication Date (Print):October 1, 1992Publication History Published…
Because of their preferred orientation, the addition of boron nitride dispersions to hot‐pressed boron carbide was found to result in a considerable degree of anisotropy in thermal conductivity of the resulting composite, indicated by an increase in the thermal conductivity perpendicular to the hot‐pressing direction…
An experimental investigation of the packing of some ternary mixtures of nonspherical particles has been conducted. The double extrapolation method is used to determine the packing density of a particle mixture in infinite space. The application of experimental design to particulate mixture problems is demonstrated. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilane alcoholysis by a nickel(II) complex in a N, O, S ligand environmentDaniel E. Barber, Zheng Lu, Thomas Richardson, and Robert H. CrabtreeCite this: Inorg. Chem. 1992, 31, 22, 4709–4711Publication Date (Print):October 1, 1992Publication History Published online1 May 200…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduced nitrogen hydride complexes of a cofacial metallodiporphyrin and their oxidative interconversion. An analysis of ammonia oxidation and prospects for a dinitrogen electroreduction catalyst based on cofacial metallodiporphyrinsJames P. Collman, James E. Hutchison, Matth…
Abstract Intercalation of naphthalene and anthracene into alkyltrimethylammonium (C n H 2n+1 (CH 3 ) 3 N + ; n = 8, 12, 14, 16, and 18)-montmorillonites was carried out by novel solid-solid reactions at room temperature. Octyltrimethylammonium(C8)-montmorillonite did not form an intercalation compound with either naph…
The development of heat affected zone microstructures in super duplex stainless steels (nominal composition Fe–25·0Cr–3·5Mo–7·5Ni–O·5Cu–0·25N–0·5W wt-%) has been examined on multipass welds, bead-on-plate welds, and simulated weld samples. Three-dimensional heat flow equations, for different plate thicknesses, have be…
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Magnesium sulfate's attack on cement‐based materials results in massive deposition of gypsum and brucite accompanied by decalcification of calcium silicate hydrate (CSH) (the binding material of the cement). Magnesium silicate hydrate (MSH) appears as a late‐stage product, mainly on deteriorated surfaces, and replaces…
Abstract An efficient method is reported for the preparation of metallophthalocyanines (MtPcs) with D2h symmetry (di-substituted type). A ZnPc with D2h symmetry thus obtained has been characterized by NMR, absorption, fluorescence emission and excitation and magnetic circular dichroism (MCD) spectroscopy, together wit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLamellar mesogels and mesophases: a self-consistent-field theoryE. B. Zhulina and A. HalperinCite this: Macromolecules 1992, 25, 21, 5730–5741Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Published inissue 1 October 1992https://doi.org…
The Commission on Powder Diffraction of the International Union of Crystallography has undertaken an intercomparison of Rietveld refinements performed with two `standard' PbSO 4 powder diffraction patterns: a conventional (two-wavelength) X-ray pattern collected on a Bragg–Brentano diffractometer with Cu Kα radiation…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and chemical properties of ptilomycalin AIkuko Ohtani, Takenori Kusumi, Hiroshi Kakisawa, Yoel Kashman, and Shulamit HirshCite this: J. Am. Chem. Soc. 1992, 114, 22, 8472–8479Publication Date (Print):October 1, 1992Publication History Published online1 May 2002Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(β-hydroxybutyrate) stereoisomers: a model study of the effects of stereochemical and morphological variables on polymer biological degradabilityJohn E. Kemnitzer, Stephen P. McCarthy, and Richard A. GrossCite this: Macromolecules 1992, 25, 22, 5927–5934Publication Date…
Abstract The thermal degradation of polymethacrylic acid was found to have two separate decomposition regions. The first decomposition region, due to anhydride formation primarily, was caused by the conversion of polymethacrylic acid to polymethacrylic anhydride. This reaction followed first‐order kinetics and had an…
Abstract Sorption and diffusion of water vapor are investigated gravimetrically for polyimide films. The activity dependence of the solubility and diffusion coefficients, S and D , respectively, is classified under four types: (1) constant S and D type, (2) dual‐mode sorption and transport type, (3) dual‐mode type fol…