Materials Literature
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The incoherent scattering law for neutron quasi-elastic scattering in liquid crystals is calculated using a classical formalism including (anisotropic) self-diffusion, rotational motion along the long molecular axis and short time vibrational behaviour. Explicit expressions are given for oriented as well as for unorie…
An extracellular coat from glycerol-induced myxospores of Myxococcus xanthus has been isolated and characterized. Coats were examined chemically and by using both transmission and scanning electron microscopy. On a dry weight basis, approximately 75% of the coat is polysaccharide composed entirely of galactosamine and…
A large deformed grain of plagioclase (Anno) contains numerous deformation (kink) bands and fewer broader kink-like zones that may have involved fracturing. The plagioclase has been recrystallized along narrow zones of relatively high strain. The orientations of the new grains are close to that ofthe original grain, i…
The threshold displacement energy E d, has been determined by high-voltage electron microscopy for copper and vanadium as a function of orientation with the following results: for copper, E d⟨100⟩=27 eV, E d⟨110⟩=18 eV, E d⟨111⟩=29 eV and for vanadium, E d⟨100⟩=30eV, E d⟨110⟩=39eV, E d⟨111⟩=34eV. The minimum threshold…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopic study of cobalt(II) Schiff base complexes and their oxygenation productsJ. H. Burness, J. G. Dillard, and L. T. TaylorCite this: J. Am. Chem. Soc. 1975, 97, 21, 6080–6088Publication Date (Print):October 1, 1975Publication History Published o…
Abstract This review of the literature shows that there have been many attempts to modify or revise the original definition of halloysites as distinguished from kaolinites, which was based on the greater water content of the halloysites. In general, these various attempts have arrived at definitions of halloysites as…
Interferometric measurements of the linear thermal expansion coefficients αc and αa in the c and a axial directions of well-orientated hexagonal pyrolytic boron nitride are reported for temperatures between approximately 80 and 780 K. The primary data for the direction parallel to the c-crystallographic axis yield smo…
Abstract The long straight-line oligomer complexes (1) and (2), composed of metal atoms of the platinum group and conjugated poly-yne systems, and the shorter chain members of the series, (3)∼(6), were prepared and their UV spectra were studied.
Abstract This paper describes a method to obtain contact angle by observing the shape of a liquid drop attached to a monofilament. The relations between contact angle and the dimensions of drops are theoretically obtained. Thus, it is possible to calculate the contact angle if drop shape is measured. Through use of th…
The present study establishes hyperfine field systematics at the non-magnetic sites in Heusler alloys and emphasizes the effect of local screening on the hyperfine field value. A range of Heusler alloy hosts were doped with 1 at.% of the isotope 119Sn for examination using the Mossbauer effect. The results reported in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel rhodium(I)-porphyrin complexes and organorhodium(III)-porphyrin complexes. IVHisanobu Ogoshi, Junichiro Setsune, Takashi Omura, and Zenichi YoshidaCite this: J. Am. Chem. Soc. 1975, 97, 22, 6461–6466Publication Date (Print):October 1, 1975Publication History Published…
The kinetics of passivity breakdown and nucleation of pitting of preanodized aluminum by chloride ions has been investigated using aluminum supporting oxide films of reasonably well‐known thickness and structure. The kinetics of passivity breakdown at the steady‐state, critical pitting potential is influenced by chlor…
Abstract A thorough examination of some cationic copolymerization systems by a new method has shown that many published r values have to be corrected significantly and that some are erroneous and meaningless, because for these systems the conventional copolymer compositions equation does not hold. Available informatio…
Heme A, isolated from bovine heart muscle by procedures which include extractions into pyridine/chloroform and two-phase, liquid-liquid chromatography on Celite, has been converted to several derivatives. Examination of the proton nuclear magnetic resonance (PMR) spectra and other properties of these derivatives revea…
Preparation, properties, and applications of porous silicon film were investigated. Silicon single crystal is converted into porous silicon film by anodization in concentrated hydrofluoric acid at currents below the critical current density. When an n‐type silicon was anodized, the silicon surface was illuminated to g…
M\"ossbauer and other studies establish that in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Co}{\mathrm{O}}_{3}$ ($x>0.125$), ferromagnetic ${\mathrm{Sr}}^{2+}$ -rich clusters coexist with paramagnetic ${\mathrm{La}}^{3+}$ -rich regions in the same crystallographic phase, with the ferromagnetic compon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of new tetraphenylporphyrin molecules containing heteroatoms other than nitrogen. I. Tetraphenyl-21,23-dithiaporphyrinA. Ulman and J. ManassenCite this: J. Am. Chem. Soc. 1975, 97, 22, 6540–6544Publication Date (Print):October 1, 1975Publication History Published o…
Surface crystallization of a Au+-ion-implanted lithia-alumina-silica glass has been realized. Annealing of a glass sample implanted with 285-keV Au+ ions at 550 °C results in the growth of colloidal Au particles of 18–35-Å radius. The Au particles constitute sites for the precipitation of lithium metasilicate crystals…
Abstract Optical brighteners are used in detergents, textiles, paper, plastics, and paints. Most optical brighteners contain heterocycles such as coumarins, 2‐pyrazolines, naphthalimides, pyrazoles, triazoles, oxadiazoles, and triazines. In this article the syntheses, properties, and applications of new optical bright…
Abstract The light emission of ZnO under high one‐ and two‐quantumexcitation is investigated in the temperature region from 4 to 300 K. Emission bands are observed which can be attributed to the interactions of free excitons with phonons, free excitons and free electrons, and of bound excitons with phonons and free an…