Materials Literature
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Mössbauer spectra at 4.2°K were taken with 197Au in several aurous and auric compounds. For each oxidation state a linear correlation was observed between the isomer shift (IS) and the quadrupole splitting (QS). Both the IS and QS varied over wide ranges in both auric and aurous compounds. Neither IS nor QS alone coul…
Abstract The intercalation of several highly polar organic compounds into kaolinite and the formation of interlamellar complexes has been examined by X-ray diffraction. Some compounds intercalate directly into kaolinite, while others can only be intercalated by the displacement of a previously intercalated compound. T…
Abstract When kaolinite undergoes percussive grinding, pronounced changes take place in its i.r. absorption spectrum even in the earliest stages of the grinding when the lattice is not yet destroyed. In this report, attention is directed to the change in the stretching bands of the hydroxyl ions. A remarkably rapid ef…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantum efficiencies of transition-metal complexes. I. d-d LuminescenceGlenn A. Crosby and James N. DemasCite this: J. Am. Chem. Soc. 1970, 92, 25, 7262–7270Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published inissue 1 December 19…
The thermal expansion behavior of the two duplex systems, lead-fused silica and aluminum-silicon, has been investigated experimentally above and below room temperature. The microstructure in the first case consisted of fused silica particles in a lead matrix, while silicon constituted the dispersed phase in the second…
Stress corrosion cracking in AISI 4340 steel was studied utilizing an Sb/Sb2O3 Ag/AgCl probe which simultaneously measures the crack tip electropotential and the electrolyte pH of the region. Additional confirmatory measurements were made with a glass electrode and Ag/AgCl reference electrode. Specimens heat treated t…
At rest between parallel plates, cholesteric liquid crystals commonly exhibit a characteristic twisted orientation pattern, the axis of twist being perpendicular to the plates. Also, this orientation pattern appears possible in nematic liquid crystals, since it is consistent with continuum theory(1) for both types of…
Liquid crystals are considered as gases of long barlike molecules. Variables describing the position and orientation of individual molecules are introduced. These are used to arrive at a microscopic definition of the order in liquid crystals in terms of a symmetric traceless tensor. The Frank and Leslie-Ericksen direc…
A fluid of hard rods is considered as a model for nematic liquid crystals. A direct application of the scaled particle approach results in an inconsistent thermodynamics. A simplified version which is consistent gives an integral equation for the orientational distribution which has the same form as that used by Onsag…
Molecular dynamics experiments made on a system of 864 particles interacting through a Lennard-Jones potential for various high-density states are used to study the self-correlation in classical fluids. The self-diffusion constant is computed and interpreted in terms of a hardsphere model. The memory-function formalis…
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The volume changes accompanying extension of peroxide vulcanizates of natural gum rubber were measured using a dilatometer technique. Measurements of the force-extension behavior and compressibilities were made on the same samples for the range of extension and volume change covered in the volume experiments. A consta…