Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and decomposition of E- and Z-3,3,5-trisubstituted 1,2-dioxolanesMasaya Yoshida, Masahiro Miura, Masatomo Nojima, and Shigekazu KusabayashiCite this: J. Am. Chem. Soc. 1983, 105, 20, 6279–6285Publication Date (Print):September 1, 1983Publication History Published o…
Using SEM techniques, magnetic domains have been studied in amorphous ribbons of Co70.3Fe4.7Si15B10annealed to produce different values of transverse anisotropy constant Ku. The average domain width varied as Ku-1/6, in agreement with theoretical models incorporating the μ-effect. Domains were also studied in ribbons…
As part of the National Reduced Enrichment Research and Test Reactor Program, Argonne National Laboratory (ANL) is engaged in a fuel alloy development project. The reduction of the 235U enrichment from above 90% to below 20% for such fuels would lessen the risk of diversion of the fuel for nonpeaceful uses. Fuel alloy…
An extension of the McMillan (1975) and Nakanishi and Shiba (1977) models of charge-density-wave formation which fully reflects the space-group symmetry of the $1T\ensuremath{-}\mathrm{Ta}{\mathrm{S}}_{2}$ structure is presented. The model allows an incommensurate $c$-axis wave vector immediately below the normal to i…
From several polyvinyl alcohol (PVA)-utilizing mixed cultures, two component bacterial strains essential for PVA utilization were isolated, and their properties and roles in PVA utilization were studied. Each pair of essential component strains consisted of a type I strain, which produced a PVA-degrading enzyme and co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic ground state of iron(II) phthalocyanine as determined from accurate diffraction dataPhilip Coppens, Liang Li, and Nai Jui ZhuCite this: J. Am. Chem. Soc. 1983, 105, 19, 6173–6174Publication Date (Print):September 1, 1983Publication History Published online1 May 20…
The cholesteric pitch P of lyotropic mesophases of hydroxypropyl-cellulose are determined from optical measurements, i.e., angular dependence of the scattered light intensity and transmission spectra. The observed results are explained with help of Pincus’ theory for cholesteric liquid crystals. The variations of the…
Abstract High molecular weight polymers have become well established as packaging or container materials. Unlike metallic and ceramic barriers, however, polymer films are known for their semipermeable nature; that is, they permit small gaseous and vapor molecules to migrate through their atomic/molecular structures. S…
Abstract 1. A silane coupling agent (Si-69) reduces the viscosity and increases the scorch lime in silica- and clay-filled EPDM. The cure lime of silica-filled mixes remained unchanged and that of clay-filled mixes increased on addition of Si-69. 2. In the presence of Si-69, the silica-EPDM system exhibits higher poly…
In this lecture, the author reviews the history of thought on multiple bonds between metals and then gives detailed attention to some of the recent developments having to do specifically with multiple M-M bonds.
High‐purity lithium oxide was synthesized by thermal decomposition of the peroxide at temperatures up to 1070 K under dynamic vacuum. Analyses of typical preparations gave carbonate 0.01 to 0.02%, hydroxide 0.0 to 0.2%, sodium 0.002%, manganese 0.0004%, and lithium oxide 99.8 to 100.0%. The corrected melting point was…
The low-temperature heat capacity of antiferromagnetic ternary iron silicides ${M}_{2}{\mathrm{Fe}}_{3}{\mathrm{Si}}_{5}$ ($M=\mathrm{Sm}, \mathrm{Gd}\ensuremath{-}\mathrm{Yb}$) has been measured from 0.5 to 30 K. Antiferromagnetic ordering temperatures range from 1.06 to 10 K for these materials including multiple ma…
Superconducting ${T}_{c}$ can be increased by a low concentration, less than 1%, of irradiation-induced defects in the layered charge-density-wave (CDW) compounds $2H\ensuremath{-}\mathrm{Nb}{\mathrm{Se}}_{2}$, $2H\ensuremath{-}\mathrm{Ta}{\mathrm{S}}_{2}$, and $2H\ensuremath{-}\mathrm{Ta}{\mathrm{Se}}_{2}$. This is d…
qualitatively account for the role of these low-energy, doubly occupied MO's.Later on, we shall propose a quantitative approach of the spin polarization in coupled systems.We can already notice that, in this respect, the situation encountered with the end-on azido bridge is quite peculiar.The quasi- absence of overlap…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultiple-state emission and intramolecular electron-transfer quenching in rhenium(I) bipyridine based chromophore-quencher complexesT. David Westmoreland, Hubert Le Bozec, Royce W. Murray, and Thomas J. MeyerCite this: J. Am. Chem. Soc. 1983, 105, 18, 5952–5954Publication Da…
Formation of HD from D2 has been demonstrated with nitrogenase preparations from Azotobacter vinelandii, Clostridium pasteurianum, Klebsiella pneumoniae, and Azospirillum sp. We conclude that the formation of HD from D2 is a general property of nitrogenases. However, the nitrogenases differ in their Ki values for D2 (…
A comprehensive analysis of elastic light scattering in cholesteric liquid-crystal systems, based upon the Mueller matrix approach, is given. Emphasis is placed upon analyzing the polarization state of the scattered light for arbitrarily polarized incident radiation. The theory is applied to the ordered cholesteric bl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of molecular weight on polymer blend phase separation kineticsRichard Gelles and Curtis W. FrankCite this: Macromolecules 1983, 16, 9, 1448–1456Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published inissue 1 September 1983ht…
The relationship between eddy current losses and magnetization dynamics is investigated on general bases, starting directly from Maxwell equations. The intrinsically stochastic character of the magnetization process is conveniently dealt with by describing the magnetization rate İ(r,t) as a random sequence of element…
A program incorporating the previously described double dipole model of the macrocyclic ring current in the porphyrin and chlorin ring is presented which allows the geometry of the aggregated species in solution to be obtained from observed NMR aggregation shifts. The model is capable of handling dimeric or oligomeric…