Materials Literature
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Abstract— For a variety of chemically defined, synthetic and natural porphyrins, the tendency for self aggregation, binding to serum albumin, distribution coefficient betweenoctanol–1 and water and uptake in V79 Chinese hamster cells have been determined. A strong correlation was found between cell uptake and distribu…
A wet‐chemical approach is applied to derive fine powders with compositions 11 mol% CeO 2 ‐ZrO 2 , 1 mol% YO 1.5 ‐10 mol% CeO 2 ‐ZrO 2 , 12 mol% CeO 2 ‐ZrO 2 , and 2 mol% YO 1.5 ‐10 mol% CeO 2 ‐ZrO 2 by the coprecipitation method. The characteristics of the as‐derived powders are evaluated through thermal analysis and…
Abstract Due to their unique polarity, pore-size distribution, and high surface areas, pillared and delaminated clays are potentially useful materials for the adsorption of environmental toxicants. To determine their properties for adsorption of chlorinated phenols, alumina-pillared montmorillonite (APM), chromia-pill…
NiOx films were made by dc magnetron sputtering of Ni in O2 at a rate of <0.15 nm s−1. The grain size was ∼10 nm and the crystal structure was cubic. Electrochemical hydration, and ensuing conversion to electrochromic NiOxHy, took place in KOH. Spectrophotometric measurements in the 0.35–2.5-μm range showed tha…
Abstract The structure parameter x (also known as the nonlinearity parameter), which in the KAHR model determines the relative contributions of temperature and structure to the retardation times of polymers in the glass transition region, is evaluated experimentally for a narrow molecular weight fraction of atactic po…
Application de simulations par ordinateur utilisant la technique de dynamique moleculaire a un verre de silice dans des domaines de temperature compris entre 300 et 9000 K et de pression compris entre 0 et 175 kbar
Incident-beam monochromators have been available commercially for many years, but the significant advantages of their use in conventional divergent-beam diffractometry are not widely appreciated. The improvement in the quality of diffraction data which results from the removal of the Kα2 component of Kα radiation at s…
Transcription of the Bombyx mori fibroin gene in a posterior silk gland extract can be separated into three functional steps on the basis of sensitivity to Sarkosyl: 1) formation of an initiation complex, which is blocked by 0.025% Sarkosyl; 2) conversion of the initiation complex to an elongation complex, a step sens…
The Bacillus subtilis hom gene, encoding homoserine dehydrogenase (L-homoserine:NADP+ oxidoreductase, EC 1.1.1.3) has been cloned and its nucleotide sequence determined. The B. subtilis enzyme expressed in Escherichia coli is sensitive by inhibition by threonine and allows complementation of a strain lacking homoserin…
The isotropic elastic moduli of four specimens of nitrogen‐stabilized cubic aluminum oxide (ALON) were measured using pulse superposition interferometry. Experiments were carried out as a function of both pressure (ambient to 1 GPa) and temperature (0° to 25°C) for specimens of 30.0 and 35.7 mol% AlN. The second‐order…
Abstract The monoclinic‐to‐orthorhombic phase transformation induced by heat‐treatment in polyethylene was studied by x‐ray and neutron diffraction. X‐ray diffraction patterns obtained with a position‐sensitive proportional counter system showed overlaps of the several reflections of orthorhombic and monoclinic forms.…
Abstract Methods for the computation of one‐ and two‐electron spin‐orbit integrals over Gaussian‐type basis functions are presented. We show that existing nuclear‐attraction and electron‐repulsion integral codes can be readily adapted for the efficient evaluation of spin‐orbit integrals; in particular, one can take ad…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of magnetic and structural properties in solids containing antiferromagnetically coupled metal centers using NMR methods. Magneto-structural correlations in anhydrous copper(II) n-butyrateGordon C. Campbell and James F. HawCite this: Inorg. Chem. 1988, 27, 21,…
Selected experimental results are presented from an extensive experimental investigation of dc prebreakdown and breakdown processes in vacuum along solid insulators made of a variety of alumina ceramics and polymers. The investigations included measurements of predischarge current, x-ray intensity, insulator surface c…
Strong diffuse scattering has been observed on electron diffraction photographs of β-cristobalite. This is observed to be in the form of diffuse planes normal to the six (110) directions. A simple Born–von Karman force model including nearest-neighbour Si–O, O–O and Si–Si interactions has been used to calculate lattic…
This paper discusses the main factors that play an important role in the formation and stabilization of emulsions containing finely divided solids. The influence of contact angle, particle size, particle interactions, and surfactants on emulsion behavior is discussed, and the state of the art in experimental technique…
A thermodynamic model of the ferroelectric SmC* phase, based on an extended Landau expansion of the free-energy density, is presented. We discuss how the signs of the parameters entering the model are depending on whether the pitch of the helix is right-handed or left-handed and whether the compound is of the (+) or (…
The Stoner model of ferromagnetism in metals is generalized to reproduce the results of spin-polarized total-energy band calculations with the fixed-spin-moment procedure. The Stoner parameter for the exchange field is made a function of both volume and magnetic moment and evaluated from the band calculations. A gener…
The deformation characteristics of Ti–6Al–4V have been established by torsion testing in the temperature range 800–1150°C. Constitutive equations are proposed for both the β-region and the α+β-region which, it is suggested, may have some practical applications. Extensive optical and electron microscopy have establishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of solid thianthrene cation radical tetrafluoroborateBogdan Boduszek and Henry J. ShineCite this: J. Org. Chem. 1988, 53, 21, 5142–5143Publication Date (Print):October 1, 1988Publication History Published online1 May 2002Published inissue 1 October 1988https://pu…