Ferromagnetically coupled gadolinium(III)copper(II) molecular material
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Micellization of polystyrene-poly(ethylene oxide) block copolymers in water. 5. A test of the star and mean-field models
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicellization of polystyrene-poly(ethylene oxide) block copolymers in water. 5. A test of the star and mean-field modelsRenliang Xu, Mitchell A. Winnik, Gerard Riess, Benjamin Chu, and Melvin D. CroucherCite this: Macromolecules 1992, 25, 2, 644–652Publication Date (Print):J…
Production of Fine, High‐Purity Beta Silicon Carbide Powders
Submicrometer SiC ( β ‐form) powders were synthesized by reacting silica and carbon black at temperatures between 1450° and 1800°C. Simultaneous application of vacuum and mixing provides the condition for full conversion of silica to SiC. It was shown that two different reaction mechanisms are possible, depending on t…
A polyoxometalate incorporating an organoimido ligand: preparation and structure of [Mo5O18(MoNC6H4CH3)]2-
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA polyoxometalate incorporating an organoimido ligand: preparation and structure of [Mo5O18(MoNC6H4CH3)]2-Yuhua Du, Arnold L. Rheingold, and Eric A. MaattaCite this: J. Am. Chem. Soc. 1992, 114, 1, 345–346Publication Date (Print):January 1, 1992Publication History Published…
New Directions in Polyvanadate Chemistry: From Cages and Clusters to Baskets, Belts, Bowls, and Barrels
As fragments of the V2O5 layer structure (shown right; spheres for bridging O atoms are large and shaded, for terminal O atoms large and open, and for V atoms small and open) the recently prepared, novel polyvanadate structures mentioned in the title are reported and systematized. In contrast to the classical polyoxoa…
Preparation of colloidal gold by photoreduction of tetracyanoaurate(1-)-cationic surfactant complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of colloidal gold by photoreduction of tetracyanoaurate(1-)-cationic surfactant complexesKanjiro Torigoe and Kunio EsumiCite this: Langmuir 1992, 8, 1, 59–63Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1…
Temperature-dependent relaxation of the crystal-amorphous interphase in poly(ether ether ketone)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature-dependent relaxation of the crystal-amorphous interphase in poly(ether ether ketone)Pengtao Huo and Peggy CebeCite this: Macromolecules 1992, 25, 2, 902–909Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 J…
Rh–CeO 2 interaction induced by high-temperature reduction. Characterization and catalytic behaviour in transient and continuous conditions
The effects of the high-temperature reduction of Rh/CeO2 catalyst on the hydrogenation of CO, CO2, acetone and ethene, and on the hydrogenolysis of ethane, in transient and continuous conditions, have been investigated. The high-temperature reduction (HTR) at 773 K induced a transient Rh–CeO2 interaction in the cataly…
Synthetic amphiphile vesicles
A. M. Carmona-Ribeiro, Chem. Soc. Rev., 1992, 21, 209 DOI: 10.1039/CS9922100209
The importance of statistical characteristics of partial discharge data
A digital partial discharge (PD) measuring concept which is designed to acquire not only conventional PD charge magnitudes but also statistical characteristics of PD signals which contain most significant information on insulation defects is described. The latter fact is explained by a physical discharge model for dis…
Plasma polymerization processes
1. Introduction. Historical background. Plasma polymerization and related processes of polymer film formation. 2. Fundamentals of Plasma Physics. Electrical breakdown in a gas and the d.c. glow discharge. Characterization of low temperature plasma generated by a glow discharge. Radio frequency and microwave discharges…
Genetically directed syntheses of new polymeric materials. Expression of artificial genes encoding proteins with repeating -(AlaGly)3ProGluGly- elements
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGenetically directed syntheses of new polymeric materials. Expression of artificial genes encoding proteins with repeating -(AlaGly)3ProGluGly- elementsKevin P. McGrath, Maurille J. Fournier, Thomas L. Mason, and David A. TirrellCite this: J. Am. Chem. Soc. 1992, 114, 2, 727…
Feature article. Preparation of new polyimide–silica hybrid materials via the sol–gel process
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…
Dynamic generalization of the scalar Preisach model of hysteresis
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…
Control of intrinsic brittleness and toughness of polymers and blends by chemical structure: A review
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…
Microstructural Development During Gas‐Pressure Sintering of α‐Silicon Nitride
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…
Poly(L-lactic acid)/Pluronic blends: characterization of phase separation behavior, degradation, and morphology and use as protein-releasing matrixes
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…
Silane dendrimers
A wide variety of silane dendrimers with up to 972 end groups has been synthesised in excellent yields using repetitive alkenylation–hydrosilylation cycles.
Subunit assembly and active site location in the structure of glutamate dehydrogenase
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…
Analysis of the effect of electron correlation on charge density distributions
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…