Materials Literature
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Abstract Poorly crystalline inorganic materials were removed from soil clays of different origin and mineral composition by successive treatments with sodium dithionite, 2 % Na 2 CO 3 and 0·5 N NaOH. Techniques are described whereby difference spectra representing the infrared absorption of the materials removed by th…
1. Mass spectra of the trimethylsilyl derivative and the methyl ester of the N-trifluoroacetyl derivative of bacilysin indicated that the antibiotic had a molecular weight of 270. Several peaks in the spectrum of the methyl ester were consistent with the presence of an N-terminal alanine residue in the molecule. 2. Th…
A theory of cubic-to-tetragonal transformations occurring in spinels containing octahedrally coordinated ($B$ site) ${d}^{9}$ and ${d}^{4}$ transition-metal ions in high concentration is developed. The problem is treated in the spirit of the molecular field approximation. For each Jahn-Teller (JT) susceptible ion in t…
We have found that the lifetime of aluminum films subjected to high current densities at elevated temperatures can be increased by the addition of copper. Previous studies have indicated that the failure mechanism is a combination of electromigration-induced phenomena, including nucleation and growth of voids, which a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin label studies of oriented smectic liquid crystals (a model system for bilayer membranes)Joachim SeeligCite this: J. Am. Chem. Soc. 1970, 92, 13, 3881–3887Publication Date (Print):July 1, 1970Publication History Published online1 May 2002Published inissue 1 July 1970http…
Abstract Two octyl-ammonium vermiculite complexes with different 001 periodicities have been studied by i.r. spectroscopy. In each case i.r. spectroscopy affords information on the orientation of the — NH 3 + groups and the strength of the hydrogen bond between these groups and the silicate oxygen surfaces. Also a per…
An exciton is a quantum of electronic excitation energy travelling in the periodic structure of a crystal; it is electrically neutral and hence its movement through the crystal gives rise to the transportation of energy but not charge. This is a concise description of the ideal exciton. The authors give a more physica…
Abstract The ability of selected phosphorus‐containing compounds and nitrogen‐containing compounds to act as flame retardants for cotton cellulose was investigated using flame tests, thermal gravimetric analysis (TGA), and differential thermal analysis (DTA). The effectiveness of the organophosphorus compounds was fou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleRuthenium complex having both linear and bent nitrosyl groupsCortlandt G. Pierpont, Donald G. Van Derveer, William Durland, and Richard EisenbergCite this: J. Am. Chem. Soc. 1970, 92, 15, 4760–4762Publication Date (Print):July 1, 1970Publication History Published online1 May 200…
Abstract The weathering of biotite in a sedentary soil profile developed on biotitehornblende- rock near Rehiran, Inverness-shire has been investigated by optical, X-ray, chemical, infrared and differential thermal methods. In the C horizon a direct transformation to hydrobiotite was observed. This involves oxidation…
Measurements of the solubility of calf-skin tropocollagen in neutral phosphate buffers in the temperature range 20-37 degrees C show that native collagen fibril formation is an endothermic process made thermodynamically favourable by a large positive entropy of precipitation associated with structural changes in the s…
Measurements have been made of magnetization curves obtained by applying stresses to various polycrystalline magnetic materials in the presence of a small, constant, magnetic field. The materials examined were nickel, mild steel, and both isotropic and cube textured silicon iron. Residual stray fields were carefully c…
Abstract Recently developed techniques permit the estimation of the surface free energy of polymers and the separation of this free energy into dispersion and hydrogen‐bonding components. These techniques have been used to calculate the thermodynamic reversible work of adhesion of a vinylidene chloride copolymer coati…
In x-ray photoe lectro n spectrosco py (XPS), a sample is exposed to low energy x rays (a pp rox im ately keY), and th e res ultant photoelectrons a re analyzed with hi gh precis ion for kin eti c energy. Aft er co rrection for in e las ti c scatt erin g, th e measured ph otoe lectron spectrum s hould refl ect th e va…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTANNUAL REVIEW Solids MixingL. T. Fan, S. J. Chen, and C. A. WatsonCite this: Ind. Eng. Chem. 1970, 62, 7, 53–69Publication Date (Print):July 1, 1970Publication History Published online1 May 2002Published inissue 1 July 1970https://pubs.acs.org/doi/10.1021/ie50727a009https://…
Compression-annealed pyrolytic graphite and single-crystal graphite specimens were irradiated with neutrons for total exposures of 3 to 71×1017 neutrons/cm2 (nvt) at 50°C, 3 to 8×1019 nvt at 650°C and 1.2×1020 nvt at 1000°C. The elastic constants of the materials were determined before and after irradiation by ultraso…
Abstract Poly(ethylene glycols) of molecular weights 200 to 20000 were strongly adsorbed on montmorillonite from aqueous solution. Free energies of adsorption calculated from the adsorption isotherms became more negative with increase in molecular weight and the entropy change became increasingly positive, probably du…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcid-base equilibriums, kinetics of copper ion incorporation, and acid-catalyzed zinc ion displacement from the water-soluble porphyrin .alpha.,.beta.,.gamma.,.delta.-tetrakis(1-methyl-4-pyridinio)porphine tetraiodidePeter Hambright and Everly B. FleisherCite this: Inorg. Ch…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance study of coordination to the fifth and sixth positions of .alpha.,.beta.,.gamma.,.delta.-tetra(p-methoxyphenyl)porphinatocobalt(II)Frances Ann WalkerCite this: J. Am. Chem. Soc. 1970, 92, 14, 4235–4244Publication Date (Print):July 1, 1970Publication H…
From a study of silane coupling agents in reinforced plastics, a general mechanism of adhesion to hydrophilic mineral surfaces has been devised. According to this theory, adhesion of polymers to dissimilar surfaces is described as a dynamic equilibrium of making and breaking of adhesion bonds between polymer segments…