Materials Literature
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The optical absorption in doped direct gap semiconductors in which the conduction band may be considered as a degenerate Fermi system is studied near the Burstein edge. The problem is treated within a simple model by the methods of perturbation theory taking into account the final-state interaction between conduction…
Abstract Modification of the carboxyl groups in hen's egg white lysozyme by the carbodiimide-nucleophile procedure developed in this laboratory has shown that all of the carboxyl groups except glutamic 35 can be modified under normal assay conditions. The presence of the substrate protects the aspartic acid residue 52…
Mössbauer spectroscopic data for a range of substituted alkyl- and aryl-tin(IV) compounds are presented. In presumably isostructural series of these and other compounds, the quadrupole splitting increases in the orders: alkyl ∼ aryl ∼ CHCH2 < C6Cl5∼ C≡CPh < C6F5∼ CF3 < SSnR3 < OSnR3, I < Br < Cl < F, and C6H5 < CHCH2…
The temperature dependences of electrical resistivity and thermal expansion were measured for face-centered cubic Fe 65 (Ni 1- x Mn x ) 35 ternary alloys. The electrical resistivity of ferromagnetic alloys ( x <0.3) decreases with increasing magnetic ordering. In contrast to this, the resistivity of antiferromagnetic…
Abstract The morphology of solution cast films of butadiene and styrene block polymers in both stretched and unstretched state has been studied by electron microscopy, and has been related to the mechanical behavior of these materials. These micrographs confirm the indications from dynamic properties that this materia…
Abstract The effect of plastic deformation on the optical absorption, ESR, and thermoluminescent properties of MgO has been investigated. Plastic deformation produces an optical absorption band at about 217 nm whose intensity is proportional to the percent of deformation. No new ESR signals were detected in the deform…
Abstract Scanning electron microscopy is a method of microscopy that permits resolution better than that of the optical microscope (about 100 A) while examining one surface of a bulk specimen. The technique depends on electronic application to microscopy and has been developed over many years by electronic engineers r…
A model was proposed to analyze the dissolution phenomena involving simultaneous phase changes and its experimental demonstration was done with p-hydroxybenzoic acid and phenobarbital which change to the respective hydrates during dissolution. The mathematical expression for the dissolution according to this model was…
Le graphite exfolié par dissociation thermique de son composé d’insertion avec le chlorure ferrique possède une surface d’une homogénéité exceptionnelle.
There can be no question about the decrease in design efficiency because of the use of ideal mechanical properties listed in the handbooks plus nebulous factors of safety based solely on experience. This practice imposes special difficulties for the younger engineers. Would it not be better to use factual strengths ba…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical Structure and Crystal Size in Polymer Single CrystalsH. K. LivingstonCite this: Macromolecules 1969, 2, 1, 98–103Publication Date (Print):January 1, 1969Publication History Published online1 May 2002Published inissue 1 January 1969https://pubs.acs.org/doi/10.1021/ma…
M. Bonamico, G. Dessy and V. Fares, J. Chem. Soc. D, 1969, 697 DOI: 10.1039/C29690000697
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigand effects on the N-N bond in the nitrogen complexes of cobaltAkira Misono, Yasuzo Uchida, Taro Saito, Masanobu Hidai, and Michio ArakiCite this: Inorg. Chem. 1969, 8, 1, 168–169Publication Date (Print):January 1, 1969Publication History Published online1 May 2002Publish…
Turnbull's blue and Prussian blue are identical in all respects and consists of iron in the oxidation states of KFe(III)[Fe(II)(CN)6].
Abstract A simple model is presented for the virtual crosslink effect in triblocks of the type A–B–A, where A is a segment having a relatively high T g value and B is a segment having a relatively low T g value. It is assumed that phase relationships can be estimated by using thermodynamics of polymer mixtures, but ce…
Abstract not Available.
The saturation magnetization of a 31.4 at.% Ni–Fe alloy has been measured as a function of hydrostatic pressure between 0 and 26 kbar, and as a function of shock-wave compression between 2.5 and 112 kbar. From the hydrostatic pressure measurements, a zero-pressure value of the pressure derivative of the saturation mag…
The permeation of deuterium through thin Pyrex bulbs was measured with a mass spectrometer. The activation energies and absolute values at 200°C for permeation and diffusion were nearly the same as for deuterium in fused silica. The solubility of deuterium in Pyrex was independent of temperature, and about the same as…
Abstract Isothermal and nonisothermal spherulitic crystallization in even–odd and poly(ω‐aminocarboxylic acids) has been studied for a range of fusion conditions and solidification temperatures. The variety of spherulites so formed are classified mainly by optical microscopy. It is found that polyamides with similar t…
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