Materials Literature
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Abstract In microcellular plastics, an unfoamed skin that is integral with the foamed core can be created by allowing the nucleating gas to diffuse from the surfaces of a gas saturated specimen prior to foaming. In this paper, a semi‐empirical model is proposed that predicts the skin thickness variation in microcellul…
The current understanding of radiation damage mechanisms in alumina produced by bombardment with energetic electrons, ions, or neutrons is reviewed with particular emphasis on the relative effects of displacement damage on the aluminum and oxygen sublattices. The displacement damage equations are presented and it is s…
Nanometer ‐ sized magnetic particles can be included into polypyrrole to produce composites by means of a novel method involving ferrofluids, in which a magnetic core such as γ‐Fe 2 O 3 is surrounded by an anionic complexing shell (see Figure). This organic coating, leading to the formation of a macroanion, allows the…
Abstract A simple means of modeling termination in free radical polymerizations of a large number of monomers over a wide variety of intermediate and high conversion conditions is presented. It is shown that monomers can be divided into two classes according to the qualitative variation of their termination rate coeff…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLamellar Thickening and the Equilibrium Melting Point of PolypropyleneKhaled Mezghani, R. Anderson Campbell, and Paul J. PhillipsCite this: Macromolecules 1994, 27, 4, 997–1002Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-Resolution Electron Energy-Loss Studies of Hydrocarbon Formation from Methane Decomposition on Ru(0001) and Ru(11.hivin.20) CatalystsMing Cheng Wu and D. Wayne GoodmanCite this: J. Am. Chem. Soc. 1994, 116, 4, 1364–1371Publication Date (Print):February 1, 1994Publicatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBond strengths of transition metal diatomics: Zr2, YCo, YNi, ZrCo, ZrNi, NbCo, and NbNiCaleb A. Arrington, Thorsten Blume, Michael D. Morse, Mats Doverstaal, and Ulf SassenbergCite this: J. Phys. Chem. 1994, 98, 5, 1398–1406Publication Date (Print):February 1, 1994Publicatio…
The thermal decomposition sequence of chrysotile samples from New Zealand and Canada has been found by 29 Si and 25 Mg MAS NMR to be more complex than previously indicated by X-ray diffraction and electron optical studies. The greater part of the mineral dehydroxylates, producing a Mg-rich X-ray amorphous phase contai…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Investigation and Energetics of Mullite Formation from Sol-Gel PrecursorsCorine Gerardin, S. Sundaresan, J. Benziger, and A. NavrotskyCite this: Chem. Mater. 1994, 6, 2, 160–170Publication Date (Print):February 1, 1994Publication History Published online1 May 2002…
Normal human dermis has been analyzed using stereological methods to estimate the quantitative modifications of collagen and elastic fibers in relation to age, sex, and body region. Forty-five skin biopsies from the trunk or the limbs of 26 males and 19 females of different age were fixed in glutaraldehyde and osmium…
Nematic liquid crystals confined to supramicrometer capillary tubes with homeotropic anchoring conditions are studied using optical polarizing microscopy. The resulting microscopy textures are sensitive to the molecular anchoring strength ${\mathit{W}}_{\mathrm{\ensuremath{\theta}}}$ and the saddle-splay surface elast…
Small diameter (< 6 mm) synthetic vascular grafts fail at a clinically unacceptable rate due in large part to their inherent thrombogenicity. The development of a new cellular lining on synthetic vascular grafts would most likely improve the patency rates observed for these grafts in small diameter positions. We have…
Lactobacillus plantarum is a lactic acid bacterium that converts pyruvate to L-(+)- and D-(-)-lactate with stereospecific enzymes designated L-(+)- and D-(-)-lactate dehydrogenase (LDH), respectively. A gene (designated ldhL) that encodes L-(+)-lactate dehydrogenase from L. plantarum DG301 was cloned by complementatio…
Abstract In situ measurement of the creep compliance of poly(methyl methacrylate) (PMMA) and poly(ethyl methacrylate) (PEMA), equilibrated with a pressurized CO 2 phase, is used to determine the glass transition temperature. Corrections due to dilation of the polymer by CO 2 as well as the buoyancy are assessed. Both…
The Pechini process was used to produce high‐purity, monocalcium aluminate (CaAl 2 O 4 ) powders at temperatures as low as 900°C. Absorption spectrometry and BET measurements revealed particles with sizes ranging from submicrometer to 100 μm, with specific surface areas as high as 10 m 2 /g. Auger electron spectrometr…
Synechococcus strain GL24 is a unicellular cyanobacterium that was isolated from Fayetteville Green Lake, New York, a meromictic lake which has high Ca and SO(4) concentrations. Epicellular mineralization of Synechococcus cells in the lake is the mechanism by which extensive calcitic bioherms (or microbial reefs) have…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of Nanocomposites of Polyethers and Molybdenum DisulfideJohn P. Lemmon and Michael M. LernerCite this: Chem. Mater. 1994, 6, 2, 207–210Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation and X-ray Crystal Structure of a New Octamolybdate: [(RhCp*)2(.mu.2-SCH3)3]4[Mo8O26].cntdot.2CH3CN (Cp* = .eta.5-C5Me5)Rimo Xi, Bateer Wang, Kiyoshi Isobe, Takanori Nishioka, Koshiro Toriumi, and Yoshiki OzawaCite this: Inorg. Chem. 1994, 33, 4, 833–836Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced Coagulation of Au NanocolloidsNaoki Satoh, Hiroyuki Hasegawa, Kaoru Tsujii, and Keisaku KimuraCite this: J. Phys. Chem. 1994, 98, 8, 2143–2147Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994…
Atomistic simulation methods are used to predict the preferred solution mechanisms and their associated energies. Both full‐ and partial‐charge models are discussed. It was found that defect clustering always results in a significant lowering of the solution energies but does not change the preferred solution reaction…