Materials Literature
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The use of selected organosilicon compounds for the preparation of silicon based ceramic materials is discussed in terms of processing microstructure-property relationships. The mechanisms operative in the formation of gel derived silicate glasses and glass ceramics are reasonably well understood, but this is not true…
Mössbauer spectra of a polycrystalline form of oxidized chloro-5,10,15,20-tetra(mesityl)porphyrin- atoiron(III) [Fe(TMP)Cl], compound A, were recorded over a range of temperatures (4.2–195 K) and magnetic fields (0–6 T). These spectra of compound A exhibit magnetic features which are markedly different from those of t…
The first study of the atomic structure of Si chalcogenide glasses is reported. The Raman spectra are remarkably simple and can be understood in terms of the vibrations of a bitetrahedral ${\mathrm{Si}}_{2}{({X}_{\frac{1}{2}})}_{8}$ ($X=\mathrm{S},\mathrm{S}\mathrm{e}$) unit. The present results represent the most com…
The nucleotide sequence of a 1,163-base-pair fragment that encodes the entire thyA gene of Escherichia coli K-12 was determined. The strategy involved sequence determination of both DNA strands by using overlapping deletions that had been generated in vitro from the two ends of the fragment with BAL-31 nuclease. The a…
The thermodynamics of a system of identical electrically charged spheres in colloidal suspension in a polar fluid (typically, H2O), are calculated within a model of point particles interacting via a screened Coulomb (Yukawa) potential of suitably renormalized strength. The particles are taken to be sufficiently massiv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMesophase formation and chain rigidity in cellulose and derivatives. 1. (Hydroxypropyl)cellulose in dimethylacetamideG. Conio, E. Bianchi, A. Ciferri, A. Tealdi, and M. A. AdenCite this: Macromolecules 1983, 16, 8, 1264–1270Publication Date (Print):August 1, 1983Publication…
Octalithium zirconate was prepared by heating a pelletized stoichiometric mixture of fused lithium oxide and zirconium dioxide under a dynamic vacuum to 863 K for 40 h. The melting point was determined to be 1568 ∼5 K. Chemical inertness and high lithium atom density, 5.93 ∼10 22 atoms /cm 3 , make octalithium zircona…
A detailed reproducible procedure has been developed for the replication of human skin for scanning electron-microscopic evaluation. Utilizing a test surface, a number of negative and positive materials were evaluated for consistence and clarity of replication. Optimal replication parameters were determined and the me…
Abstract The reinforcement mechanism of polyester tire cord was studied by Fourier‐transform infrared spectroscopy using various model compounds. Three model compounds representing the main chain of polyester and the terminal groups, namely carboxylic acid and hydroxyl groups, were used. Chemical reactions between the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray diffraction and thermal analysis of molybdenum(VI) oxide hemihydrate: monoclinic MoO3.1/2H2OR. L. Fellows, M. H. Lloyd, J. F. Knight, and H. L. YakelCite this: Inorg. Chem. 1983, 22, 17, 2468–2470Publication Date (Print):August 1, 1983Publication History Published onli…
The phonon spectral function for charge density wave (CDW) systems in the superconducting (SC) phase is calculated for finite wave vectors (q). An exact expression for the q dependent phonon self-energy is obtained. The analysis is carried out with a small q limit. The spectral function shows a two peak structure for…
Abstract The initiation and build‐up to detonation of Composition B covered by steel barrier plates and impacted by a shaped‐charge jet has been studied. Two different barrier thicknesses were used representing strong and weak shock initiating systems. The results showed that, in both cases, a shock (designated the pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical passivation of carrier recombination at acid interfaces and grain boundaries of p-indium phosphideAdam Heller, Harry J. Leamy, Barry Miller, and W. Dexter Johnston Jr.Cite this: J. Phys. Chem. 1983, 87, 17, 3239–3244Publication Date (Print):August 1, 1983Publication…
Abstract The miscibility of poly(vinyl chloride) (PVC) with various ethylene copolymers and terpolymers were investigated using FT‐IR spectroscopy. All blends reported were 50/50 by weight. In blends of PVC with ethylene/dimethyl acrylamide copolymer (E/DMA), frequency shifts were observed in the amide carbonyl (proto…
Results of studies are presented examining the effect of rotor speed, rotor diameter and tandem carding on properties of open-end (OE) yams. Most of the yam properties excepting strength show a significant deterioration with increase of rotor speed, in case of strength, no consistent trend was observed. Yarn elongatio…
The reversed-flow techniquc, uscd previously to measure gas diffusion cocfficicnts. hctcrogcncous catalysis of simple first-order reactions, and othcr processes, is now cxtcndcd to thc study of the kinetics of a morc conlplicatcd rcaction, nan~cly, the oxidation of carbon monoxide over solid catalysts containing Co304…
This report is concerned with the spinodal decomposition and magnetic properties of Fe–21∼30 Cr–12Co ternary alloys (by weight) as studied by transmission electron microscopy and magnetic measurements. Wavelength growth of the isothermally aged spinodal structure is found to be proportional to time1/3 for the later st…
In order to study the gelling mechanism of gelatin, the phase diagram for a diluted gelatin solution was investigated. Phase boundary curves were obtained by measuring the fluorescent depolarization, optical rotation, reduced viscosity, and light scattering of the gelatin solution. The phase diagram obtained exhibited…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectra of matrix-isolated metal complexes of octaethylporphineJames R. Kincaid, Marek W. Urban, Takeshi Watanabe, and Kazuo NakamotoCite this: J. Phys. Chem. 1983, 87, 16, 3096–3101Publication Date (Print):August 1, 1983Publication History Published online1 May 200…
Abstract not Available.