Materials Literature
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After a description of the preparation of polymer-metal oxide hybrid materials via the sol-gel method, recent results on the preparation of new polyimide-silica hybrid materials are reviewed. Tetraethoxysilane (TEOS) can be hydrolysed and polycondensed to form a three-dimensional silica-gel network in a solution of po…
The Preisach model (PM) has received considerable attention over many years, because it encompasses the basic features of hysteresis phenomena in a conceptually simple and mathematically elegant way, and it is well suited to numerical implementations of eddy current calculations in soft materials and modeling of magne…
Abstract The intrinsic brittle‐ductile (craze‐yield) behavior of polymers and blends are controlled by two chain parameters: entanglement density v e and characteristic ratio C x . These chain parameters can be predicted from chemical structure. Therefore, the intrinsic brittle‐ductile behavior of polymers and blends…
Gas‐pressure sintering of α‐Si 3 N 4 was carried out at 1850 ° to 2000°C in 980‐kPa N 2 . The diameters and aspect ratios of hexagonal grains in the sintered materials were measured on polished and etched surfaces. The materials have a bimodal distribution of grain diameters. The average aspect ratio in the materials…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(L-lactic acid)/Pluronic blends: characterization of phase separation behavior, degradation, and morphology and use as protein-releasing matrixesTae Gwan Park, Smadar Cohen, and Robert LangerCite this: Macromolecules 1992, 25, 1, 116–122Publication Date (Print):January 1…
A wide variety of silane dendrimers with up to 972 end groups has been synthesised in excellent yields using repetitive alkenylation–hydrosilylation cycles.
The three-dimensional crystal structure of the NAD(+)-linked glutamate dehydrogenase from Clostridium symbiosum has been solved to 1.96 A resolution by a combination of isomorphous replacement and molecular averaging and refined to a conventional crystallographic R factor of 0.227. Each subunit in this multimeric enzy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of the effect of electron correlation on charge density distributionsKenneth B. Wiberg, Christopher M. Hadad, Teresa J. LePage, Curt M. Breneman, and Michael J. FrischCite this: J. Phys. Chem. 1992, 96, 2, 671–679Publication Date (Print):January 1, 1992Publication H…
Abstract The effects of crystallinity and spherulite size on the enzymatic degradation of microbial poly(3‐hydroxybutyrate) (PHB) films have been studied at 37°C and pH 7,4 in aqueous solutions of an extracellular PHB depolymerase from Alcaligenes faecalis T1. The rate of enzymatic degradation of PHB films decreases w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of a series of monodisperse, 1,3,5-phenylene-based hydrocarbon dendrimers including C276H186 and their fluorinated analogsTimothy M. Miller, Thomas X. Neenan, Roberto Zayas, and Harvey E. BairCite this: J. Am. Chem. Soc. 1992, 114, 3, 1018–1025…
Part 1 Fundamentals: the 10 nm scale - structure elements of 2...20nm size linear response thermodynamics theoretical physics code. Part 2 Relaxation: three simple models glass transition - multiplicity in amorphous polymers thermal glass transition examples. Part 3 Thermodynamics: thermodynamics of mixtures compatabi…
Ferroelectric lead zirconate titanate (PZT) films with as much as 2.5 times the storage capacity of the best reported silicon oxide/nitride/oxide (ONO) stacked dielectrics have been fabricated. A 2000-AA film with an effective SiO/sub 2/ thickness of 10 AA is demonstrated. Because of the extremely high dielectric cons…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereocontrolled synthesis of disaccharides via the temporary silicon connectionGilbert Stork and Guncheol KimCite this: J. Am. Chem. Soc. 1992, 114, 3, 1087–1088Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January…
Plenary lecture the structure of glass novel glasses and processes relaxation phenomena high temperature studies and crystallization ionic-transport high silica glasses/sol-gel synthesis optical and electrical phenomena mechanical properties chemical interactions resonance phenomena.
Calcined hydrotalcites have been used extensively as catalysts for base-catalysed reactions. The calcination procedure in critical in determining the behaviour of the final material. The characteristics of the hydrotalcite, following the different stages of calcination, have been studied by means of thermogravimetric…
The outline of the Rietveld method is described where structure and lattice parameters are directly refined from powder diffraction data. Several functions such as extinction correction, preferred-orientation function, and profile-shape function, which are contained in the model function, have been improved to give ph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduced molybdenum phosphates: octahedral-tetrahedral framework solids with tunnels, cages, and microporesRobert C. Haushalter and Linda A. MundiCite this: Chem. Mater. 1992, 4, 1, 31–48Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Pub…
Description Materials information is a commercial resource comparable with the finance, plant and the workforce, and it needs management to be used efficiently. The nomenclature and data required to characterize materials and their properties are complex, which makes the need for standards for the exchange and use of…
Abstract The colors and color patterns of soils are widely used to infer other soil properties. It is desirable to understand, at least semiquantitatively, the effect various pigments have on soil color. The purpose of this study was to determine how hematite and goethite pigments influence soil color. We prepared sim…
We study the effects of hydrodynamic interactions on the diffusion of hard spheres in concentrated suspensions. Using a multiple-light-scattering technique, we measure [H(q)], a weighted average of H(q), a function that characterizes the hydrodynamic interaction. By changing the size of the spheres we probe the partic…