Materials Literature
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Abstract A new approach to the interpretation of Mössbauer spectra of Fe 3+ -phyllosilicates having vacant trans-octahedra is based on (1) crystal structure simulation methods that allow for the size and the shape of a Fe 3+ -octahedron as a function of the nearest surrounding cations; and (2) calculations of electric…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of dynamic scattering from copolymer solutions using the random phase approximationM. Benmouna, H. Benoit, R. Borsali, and M. DuvalCite this: Macromolecules 1987, 20, 10, 2620–2624Publication Date (Print):October 1, 1987Publication History Published online1 May 2002Pu…
We present a combined experimental/theoretical study of the coverage and frequency dependence of surface (enhanced) resonance Raman scattering [S(E)RRS] of cobalt phthalocyanine (CoPc) on CaF2 roughened silver films. The experimental spectra indicate a rather strong coverage dependence at very low coverage for excitat…
We report the evolution of diffuse intensity during the low-temperature ageing of Al-Mn quasicrystals. This is taken as evidence of short-range order in the icosahedral phase prior to its decomposition. The implication of these diffuse intensities is discussed
We have obtained a complete set of 20 variants of the alpha subunit of tryptophan synthase of Escherichia coli at position 49 in order to extend our previous studies on the effects of single amino acid replacements at position 49 on structure and function. Thirteen mutant alpha subunits have been newly constructed by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPara-linked, aromatic, thermotropic polyesters with low mesophase temperaturesR. Sinta, R. A. Gaudiana, R. A. Minns, and H. G. RogersCite this: Macromolecules 1987, 20, 10, 2374–2382Publication Date (Print):October 1, 1987Publication History Published online1 May 2002Publish…
Starting powders containing 72 wt% Al 2 O 3 and 28 wt% SiO 2 , were prepared by sol‐gel methods classified as colloidal and polymeric. Compacts fired at 1700°C showed significant differences in microstructure. The specimens formed with the colloidal powder had mullite grains of prismatic shape and a liquid phase; with…
We report the results of elastic and quasielastic light scattering measurements on dilute aggregates of colloidal silica. The elastic scattering measurements indicate a fractal dimension of 2.05\ifmmode\pm\else\textpm\fi{}0.06, in agreement with previous results, but the quasielastic measurements demonstrate several n…
A computer program has been developed for the Rietveld analysis of time-of-flight neutron diffraction data taken on a high-resolution powder diffractometer, HRP, at the pulsed spallation neutron source, KENS. A new profile shape function is implemented which is optimized for a solid-methane moderator at 20 K. The prog…
Fatigue crack propagation under tension‐tension loading is observed in a transformation‐toughened partially stabilized zirconia (PSZ) ceramic containing 9 mol% MgO. Such subcritical crack growth behavior is demonstrated to be cyclically induced, based on a comparison with behavior under sustained loading (at the maxim…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect evidence for cocrystallization in binary mixtures of ferroelectric copolymersHajime Tanaka and Andrew J. LovingerCite this: Macromolecules 1987, 20, 10, 2638–2640Publication Date (Print):October 1, 1987Publication History Published online1 May 2002Published inissue 1…
Abstract A significant reduction on the time for thermal crystallization of Bisphenol‐A polycarbonate has been achieved by means of a previous crystallization step of the polymer in acetone, followed by a capillary extrusion processing at temperatures above its melting range (230–280°C). The crystallinity of PC was co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of multiplicity features for kinetic modeling: carbon monoxide oxidation on platinum/aluminaMichael P. Harold and Dan LussCite this: Ind. Eng. Chem. Res. 1987, 26, 10, 2099–2106Publication Date (Print):October 1, 1987Publication History Published online1 May 2002Publishe…
Abstract The problem of end effects influencing the ejection angles of fragments near the ends of cylindrical warheads is approached semi‐empirically. A correction term is added to the Taylor angle, based on the accepted concept that the reduced fragment velocities near the ends of a warhead are due to release waves i…
An attempt has been made to investigate the effects of aluminium, titanium, nitrogen, and boron on the hardenability of boron-bearing medium-carbon steels. It was found that not only titanium but also boron had the scavenging effect for dissolved nitrogen. A parameter designated as boron potential (Bp = xB−11/14(xN−14…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of poly[(acyloxy)aloxane] with carboxyl ligand and its utilization for the processing of alumina fiberYoshiharu Kimura, Shozo Sugaya, Toshiaki Ichimura, and Isoji TaniguchiCite this: Macromolecules 1987, 20, 10, 2329–2334Publication Date (Print):October 1, 1987Publ…
This review critically compiles all surface structures derived from low-energy electron diffraction (LEED) crystallography reported in the referred literature prior to January 1986. Over 250 investigations have been analyzed covering all types of surfaces including clean and adsorbate-covered metal, semiconductor and…
Abstract Using fluorescence spectroscopy and gel content measurement, the photolysis of simple polyurethanes based on methylene 4,4′‐diphenyldiisocyanate (MDI) is shown to depend on both the flexibility and crystallinity of the polymer. Polyurethane films based on MDI and 1,12‐dodecanediol (MDI‐12) can be either annea…
A study of the ground-state and thermodynamic properties of the Ising spin system was carried out including an external magnetic field where two exchange energies are arranged according to a Fibonacci sequence. For this model, the decimation renormalization transformation can be performed exactly as shown recently by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational spectroscopic study on the solid-state phase transition of poly(oxymethylene) single crystals from the orthorhombic to the trigonal phaseMasamichi Kobayashi, Hirofumi Morishita, Masaki Shimomura, and Masatoshi IguchiCite this: Macromolecules 1987, 20, 10, 2453–24…