Materials Literature
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Abstract A new thermal conduction model is proposed for a polymer system filled with a mixture of several types of particles. Predicted values by the new model are compared with experimental data. The model is derived by extending a model that was previously proposed for a two‐phase system. The following equation is d…
The conductivity of porous cermets at 1000°C was determined as a function of Ni content between 15 and 50 volume percent (v/o) of total solids for two different zirconia particle sizes (23 and 47 m 2 /g). Below Ni contents of 30 v/o, ionic conduction through the zirconia phase dominated. At 30 v/o Ni, a greater than t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn measuring the distribution of local free volume in glassy polymers by photochromic and fluorescence techniquesJohn G. Victor and John M. TorkelsonCite this: Macromolecules 1987, 20, 9, 2241–2250Publication Date (Print):September 1, 1987Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and physical properties of trinuclear oxo-centered manganese complexes of general formulation [Mn3O(O2CR)6L3]0,+ (R = methyl or phenyl; L = a neutral donor group) and the crystal structures of [Mn3O(O2CMe)6(pyr)3](pyr) and [Mn3O(O2CPh)6(pyr)2(H2O)].cntdot.0.5MeCN…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic analysis of phase separation behavior of model polyurethanesHan Sup Lee, Ying Kang Wang, and Shaw Ling HsuCite this: Macromolecules 1987, 20, 9, 2089–2095Publication Date (Print):September 1, 1987Publication History Published online1 May 2002Published inissue 1…
Abstract The application of corresponding state principles to describe the properties of polymers is implicit in many of the fundamental studies of polymeric behavior. The seminal works of Prigogine, Hildebrand, Eyring, Flory, Gibbs, and DiMarzio in which multidimensional lattice representations and refined statistica…
(NOTE: Each chapter concludes with Summary, References, and Problems.) Preface. 1. An Overview of Microelectronic Fabrication. A Historical Perspective. An Overview of Monolithic Fabrication Processes and Structures. Metal-Oxide-Semiconductor (MOS) Processes. Basic Bipolar Processing. Safety. 2. Lithography. The Photo…
Abstract To make sense of the marvelous electronic properties of the solid state, chemists must learn the language of solid‐state physics, of band structures. An attempt is made here to demystify that language, drawing explicit parallels to well‐known concepts in theoretical chemistry To the joint search of physicists…
A thermodynamically stable quasicrystalline single phase with an icosahedral structure was found to be formed at an atomic composition of Al 65 Cu 20 Fe 15 in a fully annealed state as well as in a conventionally solidified state. The stable quasicrystal consisted of large grains with an average size of 0.2 mm after a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of colloidal semiconductors. 20. Surface modification and stability of strong luminescing CdS particlesLubomir Spanhel, Markus Haase, Horst Weller, and Arnim HengleinCite this: J. Am. Chem. Soc. 1987, 109, 19, 5649–5655Publication Date (Print):September 1, 198…
A cohesive zone model, taking full account of finite geometry changes, is used to provide a unified framework for describing the process of void nucleation from initial debonding through complete decohesion. A boundary value problem simulating a periodic array of rigid spherical inclusions in an isotropically hardenin…
The basic ideas and a number of results of the theory of low-energy excitations and localized electronic states, which are responsible for the universal low-temperature anomalies in glasses and unusual electronic properties of nonmetallic glasses, primarily glassy semiconductors, are reviewed. The basic hypotheses and…
Isotropic Nd15(Fe1−xCox)77B8 ribbons are produced by conventional melt spinning. For moderate Co additions the coercivity HcI increases while the remanence Jr remains almost constant. Co contents above x=0.3 lead to decreasing HcI and Jr values. The beneficial effect of Co on coercivity is ascribed to the occurrence o…
A new liquid-crystal electro-optic modulating device similar to the surface-stabilized ferroelectric liquid-crystal device is described. It uses the same kind of ferroelectric chiral smectics and the same geometry as that device (thin sample in the ‘‘bookshelf ’’ layer arrangement) but instead of using a tilted smecti…
A 2D quasicrystal with an eightfold rotational axis has been found in rapidly solidified V-Ni-Si and Cr-Ni-Si alloys by means of transmission electron microscopy. The electron diffraction pattern taken along this axis shows no periodicity but a clear eightfold orientation symmetry. The corresponding high-resolution el…
The mechanisms controlling the growth rate of electrolyte crystals precipitating from aqueous solution may be classified in eight types.Most of these are associated with a specific kinetics -linear, parabolic or exponential, -and composites of these kinetics are also found.A linear kinetics is found when the crystal g…
An improved and efficient method has been developed for the purification of the tryptophan synthase alpha 2 beta 2 complex (EC 4.2.1.20) from Salmonella typhimurium containing a multicopy plasmid. Microcrystals prepared in 12% poly(ethylene glycol) 8000 containing 2.5 mM spermine are shown by scanning electron microsc…
Optical phonon spectra are investigated by infrared reflectivity measurements for La 1-x Sr x FeO 3 (x=0, 0.1, 0.25 and 0.4) and La 1-x Sr x CoO 3 (x=0, 0.02 and 0.1). Using the phonon parameters determined by Kramers-Kronig and oscillator analysis, the effective charges and the electron-phonon coupling constants are…
We have simulated the behaviour of a collection of particles interacting via the anisotropic Gay-Berne potential, using the molecular dynamics technique. The system is found to exhibit both an isotropic liquid and a nematic liquid crystal; the approximate temperature at which the transition between these phases occurs…
Abstract Blends of bisphenol‐A polycarbonate (PC) and polystyrene (PS) prepared by screw extrusion and solution casting have been investigated with weight fractions of PC in the blends varying from 0.95 to 0.05. From the measured glass transition temperatures ( T g ) and specific heat increments (Δ C p ) at the T g ,…