Materials Literature
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Abstract A second‐order transition of cellulose triacetate at approximately 30°C was studied by polarized infrared spectroscopy. The temperature dependences of infrared dichroismus were examined for the 900cm −1 (C 1 H bending vibration) and 600 cm −1 (acetyl group frequency) bands. The former changed at about 30°C,…
Article Measurement of Carbon Levels in Structurally Transformed SAE 52100 Ball Bearing Steel by Microprobe Analysis / Die Messung des Kohlenstoffgehaltes in einem umgewandelten Kugellagerstahl SAE 52100 mittels Mikrosondenanalyse was published on April 1, 1975 in the journal Practical Metallography (volume 12, issue…
William R. Cobb, Fine Structural Features of Destruction of Calcareous Substrata by the Burrowing Sponge Cliona celata, Transactions of the American Microscopical Society, Vol. 94, No. 2 (Apr., 1975), pp. 197-202
There is a growing interest in fundamental studies of surfaces, stimulated in part by the advent of new experimental techniques capable of characterizing the surface of a microscopic level, and in part by the relevance of research on surfaces to some very practical problems facing our technological society. These prob…
X-ray powder diffraction data have been developed or refined for the identification of drugs, excipients, and adulterants found in illicit preparations.
MnIn 2 Te 4 was prepared by direct synthesis from the elements at 800°C. The crystals are tetragonal, space group I 4̅ 2 m, with a = 6.191 Å, c = 12.382 Å, and Z = 2. The structure can be derived from the zincblende structure. It is related to the CdGa 2 S 4 and β-Cu 2 HgJ 4 type structures with the same ordered arran…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLinear trinuclear copper(II) complex with a spin-doublet ground stateW. A. Baker Jr. and Fred T. HelmCite this: J. Am. Chem. Soc. 1975, 97, 8, 2295–2296Publication Date (Print):April 1, 1975Publication History Published online1 May 2002Published inissue 1 April 1975https://p…
The lifetimes of gold films were measured at electrical current densities of (0.8−1.15) ×106 A/cm2 and temperatures of 220−500 °C. The effective activation energy was found to be 0.42 eV. Electromigration caused the formation of voids, hillocks, and whiskers. All films failed near the cathode, suggesting that gold ato…
The quasielastic scattering of laser light from nematic MBBA is studied utilizing homodyne procedures. The results stem from a comprehensive study of the half widths and areas of the "slow mode" peaks together with their temperature and angle dependence. The data taken at small angles yield the temperature-dependent r…
A calorimetric technique was used to accurately determine the dielectric loss tangent of both additive−free and commerical grades of polyethylene at liquid−helium temperature. We found that the loss tangent of polyethylene often exhibits a broadened dielectric relaxation peak. Although this peak is centered in the kil…
An ESR study of the [RhCl6]4− center in single crystals of AgCl has been made. The g values and chlorine hyperfine interactions observed for the axial chlorines are consistent with a d7 configuration and localization of the odd electron largely in the 4dz2 orbital. The same species has been studied in γ-irradiated sin…
Abstract Fourier transform infrared spectra have been obtained for polyethylene irradiated in oxygen and nitrogen atmospheres. The spectra before and after irradiation have been compared by digital subtraction. The difference spectra are indicative of changes caused by irradiation. Crosslinking and chain scission reac…
Abstract We report on measurements of the Larmor frequency dependence of the proton spin relaxation time T 1 in the nematic and isotropic phase of p-azoxyanisole (frequency range: 3.8 kHz ≦ ωL/2 π≦75 MHz) . In both cases our results clearly support the Pincus-Cahane mechanism of spin relaxation by order fluctuations (…
Abstract Thermosetting arylimides were prepared by reaction of sulfone ether diamines with maleic anhydride followed by chemical imidization of the intermediate polyamic acid with acetic anhydride/sodium acetate. These arylimides could be thermally cured to afford heat stable systems possessing high glass transition t…
Polymethylmethacrylate specimens are loaded by a flat-ended punch, both by impact and using an Instron machine. The deformation is compared with that produced in similarly loaded titanium and copper specimens and with related work by other researchers. It is found in these experiments that deformation occurs in locali…
Abstract The layer structure of kaolinite from Twiggs, Georgia and fire-clay type kaolinite (Frantex B, from France), particle size separates 2–0·2 μ m was studied by high resolution electron microscopy after embedment in Spurr low-viscosity Epoxy media and thin sectioning normal to the (001) planes by an ultramicroto…
The substitution reactions of tetrakis(4-N-methylpyridyl)porphinecobalt(III)(CoTMpyP) with pyridine have been studied as a function of pH at 25° and an ionic strength of 0.5 M. The mechanistic pathway proposed for the thiocyanate substitution reactions is applicable to pyridine as well. A pyridine axial substituent ha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluxional, catalytically active metal cluster, heptakis(tert-butylisocyanide)tetranickelV. W. Day, R. O. Day, J. S. Kristoff, F. J. Hirsekorn, and E. L. MuettertiesCite this: J. Am. Chem. Soc. 1975, 97, 9, 2571–2573Publication Date (Print):April 1, 1975Publication History Pu…
Abstract Bei der Darstellung von koordinativ ungesättigten Cr(II)‐ Oberflächenverbindungen führt Variation von T akt und/oder T red zu unterschiedlicher Reaktivität der Produkte, bezogen auf gleichen Oberflächen‐Cr(II)‐Gehalt. Es wird ein Parameter Q definiert, der den (mittleren) „ungesättigten Charakter”︁ der Oberfl…
Abstract In the preceding paper, general equations were established for the motions of chains confined to a tetrahedral lattice. In the present paper, bond orientation correlation and autocorrelation functions are explicitly calculated for the case where only three‐bond elementary motions are considered. Effects due t…