Materials Literature
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Abstract Epoxidation of natural rubber with peroxyacids in homogeneous solution (CHCl 3 , benzene) and in latex occurs without main chain fission or isomerization of the cis configuration. There are two possible modes of addition of oxygen to the double bond, which gives rise to diastereoisomers in dyad structures, as…
The etch rate of Si with F atoms was measured by the use of F2 microwave plasma over a range of discharge pressures between 2.7×10−2 and 17 Pa. Fluorine atom concentration in the plasma was determined over the same pressure range by means of both gas-phase titration and actinometry using Ar gas. A Si surface etched at…
Abstract The reactive impurities H 2 O, CO, H 2 and CH 4 which are present in the primary coolant helium of high temperature gas‐cooled reactors can cause scale formation, internal oxidation and carburization or decarburization of the high temperature structural alloys. In Part I of this contribution a theoretical mod…
Abstract Samples of ring and open chain polystyrene in dilute perdeuterated toluene solution were measured by small angle neutron scattering up to a value of the scattering vector Q = 2 nm −1 . The molar masses 12000 ≤ M /(g/mol) ≤ 22000, the mean square radii of gyration 〈 R 2 〉 and the second virial coefficients A 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, x-ray crystal structure, and chemical and physical properties of the new linear-chain mixed-valence complex (.mu.-iodo)tetrakis(dithioacetato)dinickel, Ni2(CH3CS2)4I, and x-ray crystal structure of the precursor tetrakis(dithioacetato)dinickel(II), Ni2(CH3CS2)4Car…
Raman spectroscopy was used to characterize phase transformations and transition temperatures in partially stabilized zirconia containing ≤20 wt% Y 2 O 3 . The completeness of the martensitic transition and its thermal hysteresis was followed in samples with ≤4 wt% Y 2 O 3 . Between 5 and 12 wt% the spectra indicate a…
The hot corrosion of sintered α‐Sic by thin films of Na 2 SO 4 and Na 2 CO 3 was studied at 1000°C in controlled gas atmospheres. Under all conditions corrosion led to 10 to 20 times the amount of SiO 2 formed in pure oxidation after a 48‐h exposure. In addition, small amounts of sodium silicate formed. Melts of Na 2…
A Ginzburg-Landau model of short-range icosahedral order in bulk liquids, and of pentagonal order in two-dimensional fluids, is used to calculate density correlation functions in these systems. The theory predicts peaks in the structure factor, at positions determined by symmetries of ideal curved-space ``crystals.''…
During steady state directional solidification of an alloy there is uniform motion of the sample relative to its thermal environment, and the solid liquid interface propagates at constant velocity. In the case of a single phase solid and a planar solid-liquid interface, there exist simple analytical solutions for the…
The approach towards complete wetting is considered for adsorbed liquid layers and for gravity-thinned layers in binary mixtures. These layers are bounded by one or two fluid-fluid interfaces. The thermal fluctuations of those interfaces are studied in the framework of effective interfacial models. Their correlation f…
Tiny single PbS crystals of ∼25 Å diameter are synthesized and studied optically in low-temperature colloidal solutions. Electron microscopic examination shows a simple cubic rock salt structure with a lattice constant unchanged, within experimental error, from the bulk value. These crystallites lack the near infrared…
Article Differential geometry of crystal structure descriptions, relationships and phase transformation was published on August 1, 1985 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 170, issue 1-4).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTJahn-Teller effect of titanium(3+) in octahedral coordination: a spectroscopic study of hexachlorotitanate (TiCl63-) complexesR. Ameis, S. Kremer, and D. ReinenCite this: Inorg. Chem. 1985, 24, 18, 2751–2754Publication Date (Print):August 1, 1985Publication History Published…
Carlosturanite is a new rock-forming silicate occurring in a network of veins crosscutting the antigorite serpentinite of Sampeyre in the Monviso ophiolite, Italy. It is light-brown, asbestiform, and the [010] fibers are paralleled by fibrous diopside and chrysotile. The mineral is monoclinic Cm, with a = 36.70, b = 9…
Abstract A new mathematical model has been developed for the continuous esterification process of terephthalic acid (TPA) and ethlene glycol (EG) with consideration of oligomer characteristics. The liquid weight fraction in the reaction mixture, β, has been selected as a principal parameter in this model. The solubili…
Hydrogen permeation transients for low-carbon iron were measured at room temperature; pure nickel and 17Cr-12Ni austenitic stainless steel (SS) specimens were electrochemically charged with hydrogen. The results for unstrained specimens were compared with those obtained under conditions of continuous stretching. A sli…
Abstract Density and wide angle x‐ray scattering techniques were used to study the form II to form I phase transformation in polybutene‐1. The influence of deformation by cold rolling, orientation produced by melt processing (film blowing), and certain additives blended with the homopolymer on the phase transformation…
Summary Alkaline chemicals in enhanced recovery operations are used (1) as preflush agents, (2) with polymers and surfactants, and (3) as a principal recovery agent. In these chemical flooding techniques, the precipitation reactions of multivalent hardness ions with alkalis are of particular concern. These reactions m…
Abstract Simha's equation of state provides the relation between reduced pressure, temperature, and volume (P̃, T̃, and Ṽ, respectively) and the occupied site fraction, y = y (P̃, T̃). The latter theoretical parameter combines the P and T effects on the occupied and unoccupied (“free volume”) part of the model liquid.…
Liquid-crystal lens-cells shaped like a plano-convex Fresnel lens with homogeneous alignment are prepared. Their focal length can be varied from the value f e for an extraordinary ray to nearly f o for an ordinary ray by applying an electric field across the cell. The response and recovery times within several seconds…