Materials Literature
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Si3N4 matrix composites with dispersed SiC particles were prepared by hot-pressing compacts of powder mixtures of sub-micron size SiC and Si3N4 particles. SiC particles in nano-meter scale were dispersed uniformly inside Si3N4 grains. After adding SiC particles, the configuration of β-Si3N4 grains changed from equiaxe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective coloration of spiro pyridopyrans for guanosine derivativesMasahiko Inouye, Kwangshik Kim, and Teijiro KitaoCite this: J. Am. Chem. Soc. 1992, 114, 2, 778–780Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 Ja…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas transport properties of liquid crystalline poly(p-phenyleneterephthalamide)D. H. Weinkauf, H. D. Kim, and D. R. PaulCite this: Macromolecules 1992, 25, 2, 788–796Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 Jan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplication of the molecular simulation technique to characterize the structure and properties of an aromatic polysulfone system. 2. Mechanical and thermal propertiesCun Feng Fan and Shaw Ling HsuCite this: Macromolecules 1992, 25, 1, 266–270Publication Date (Print):January…
Surface modification of two Teflon polymers, PFA (tetrafluoroethylene and perfluoroalkoxyvinyl ether copolymer) and PTFE (polytetrafluoroethylene), induced by argon plasma treatment using a radio frequency generator and subsequent air exposure has been investigated by x-ray photoelectron spectroscopy (XPS) and electro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of squaraine dyes. 1. Excited singlet, triplet, and redox states of bis[4-(dimethylamino)phenyl]squaraine and bis[4-(dimethylamino)-2-hydroxyphenyl]squarainePrashant V. Kamat, Suresh Das, K. George Thomas, and Manapurathu V. GeorgeCite this: J. Phys. Chem. 199…
Foreword. Relaxation Processes. Relaxation processes in small particles (A. Aharoni). Theoretical point of view on relaxation in small particles (A.M. Afanas'ev). Relaxation rate of fine magnetic particles (L. Bessais et al.). Static and dynamic study of fine particles by neutron scattering (M. Hennion et al.) Prepara…
Abstract Lime mud in northern Belize lagoon is composed predominantly of silt-size cryptocrystalline grains and clay-size clumps, both of which consist of anhedral, equant crystals less than 0.5 mu m in size. This mud is 70-90% Mg-calcite containing 9-10 mole % MgCO 3 . Detailed petrographic, morphologic and mineralog…
The stereoselective synthesis of various 1,8-disubstituted derivatives of 1,4,8,11-tetraazacyclotetradecane (cyclam) has been achieved and copper and nickel complexes prepared. For the 1,8-dibutyl derivative, the square-planar nickel(II) complex exists as two diastereoisomers, as revealed by crystallographic analysis.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic analysis of ordering and phase-separation behavior of model polyurethanes in a restricted geometryCurtis W. Meuse, Xiaozhen Yang, Decai Yang, and Shaw L. HsuCite this: Macromolecules 1992, 25, 2, 925–932Publication Date (Print):January 1, 1992Publication Histor…
Two series of La1–xSrxNiO3–λ and La1–1.333xThxNiO3–λ catalysts have been prepared, and the relationships between the solid defect structure and catalytic activity for NH3 oxidation were measured. The results showed that in the range of x < 0.3, the samples possessed single perovskite-type structure, and as the content…
To understand how albumin on the surface inhibits surface-induced platelet activation, we adsorbed albumin on dimethyldichlorosilane-coated glass (DDS-glass) and modified the adsorbed albumin by three different methods. The adsorbed albumin was crosslinked with glutaraldehyde, dried and rehydrated, or digested with tr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnnealing of silicon clustersMartin F. Jarrold and Eric C. HoneaCite this: J. Am. Chem. Soc. 1992, 114, 2, 459–464Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10.1021/ja00028a01…
A method is described to graft conducting polyaniline onto glass fabric, glass wool and nylon cloth to impart flexibility and mechanical strength to the polyaniline, which is otherwise powdery and untracable. These flexible conductive surfaces can find application as antistatic shields.
The precipitation of copper(II) hydrous oxides and basic salts from solutions that became homogeneously alkaline by forced hydrolysis of urea has been studied as a function of solution composition, ageing time and temperature. The time required for the onset of precipitation increased with the initial copper(II) conce…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTPhotoinduced electron-transfer reactions of porphyrin heteroaggregates: energy gap dependence of an intradimer charge recombination processHiroshi Segawa, Chie Takehara, Kenichi Honda, Takeo Shimidzu, Tsuyoshi Asahi, and Noboru MatagaCite this: J. Phys. Chem. 1992, 96, 2, 503–50…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplication of the xenon-adsorption method for the study of metal cluster formation and growth on Y zeoliteRyong Ryoo, Sung June Cho, Chanho Pak, Jeong Guk Kim, Son Ki Ihm, and Jeong Yong LeeCite this: J. Am. Chem. Soc. 1992, 114, 1, 76–82Publication Date (Print):January 1,…
The composition, the structure, and some physical properties of boron–carbon–nitrogen solid solutions prepared by chemical vapor deposition (CVD) have been investigated. Both crystalline films and amorphous granular materials resulting respectively from heterogeneous and homogeneous nucleation were characterized by X‐…
A simple bend stress relaxation (BSR) test has been developed to measure the creep‐related deformation properties of ceramic fibers and whiskers. The test was applied to a variety of commercial and developmental Si‐based fibers to demonstrate test capabilities and to qualitatively evaluate the relative creep resistanc…
Electron localization and optical transmission in one-dimensional systems with two components distributed according to the Rudin-Shapiro sequence are investigated. The nature of the eigenstates in the diagonal tight-binding model is studied by making use of nonlinear recurrence relations satisfied by the associated tr…