Synthetic amphiphile vesicles
A. M. Carmona-Ribeiro, Chem. Soc. Rev., 1992, 21, 209 DOI: 10.1039/CS9922100209
Materials Literature
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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…
Enzymatic degradation of microbial poly(3‐hydroxybutyrate) films
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…
Synthesis and characterization of a series of monodisperse, 1,3,5-phenylene-based hydrocarbon dendrimers including C276H186 and their fluorinated analogs
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…
Relaxation and thermodynamics in polymers : Glass transition
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…
Electrical characteristics of ferroelectric PZT thin films for DRAM applications
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…
Stereocontrolled synthesis of disaccharides via the temporary silicon connection
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…
The Physics of non-crystalline solids
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.
Thermal decomposition of hydrotalcites. An infrared and nuclear magnetic resonance spectroscopic study
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…
Special Issue-New Evolution of the Powder Diffraction Method. The Rietveld Method.
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…