Materials Literature
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The dynamical Jahn-Teller effect in the benzene negative ion is investigated by estimating the vibronic eigenfunctions and energies for the lowest energy degenerate and lowest energy nondegenerate vibronic states using Hückel molecular orbital theory and the normal coordinates for the 606 cm—1 and 1595 cm—1 E2g vibrat…
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Abstract Restrictions on freedom of rotation about the bonds of a polymer chain usually impose drastic limitations on the conformational states of polymer chains, and hence are of foremost importance in affecting the tendency of the polymer to crystallize. The severity of these restrictions notwithstanding, the random…
Mixed crystals NaCl-CdCl 2 containing a few mole per cent of CdCl 2 were examined by X-ray method. By a certain heat treatment, precipitates of a structure having f.c.c. lattice with lattice constant twice as that of the matrix are formed within the matrix. By another heat treatment, there appear diffuse spots corresp…
Cannulas were implanted in the lateral ventricles, cisterna magna and subarachnoid spaces of goats. Perfusion with synthetic cerebrospinal fluid (CSF) permitted study of exchange rates of test materials between CSF perfusion fluid and blood. Diodrast or phenolsulfonphthalein in low concentrations is removed from ventr…
B. Dacre and P. A. H. Wyatt, Trans. Faraday Soc., 1961, 57, 1281 DOI: 10.1039/TF9615701281
The thermal conductivities of the mono-carbides having NaCl type structure in several transition metals of the fourth and fifth groups on the periodic chart were measured at 0°C and at the liquid-oxygen temperature. For these substances, larger conductivity by lattice than those by conduction electrons is concluded fr…
Abstract Without modifying the General Electric XRD-5 diffractometer accurate lattice parameters of cubic structures may be determined quite simply and precisely. The method is applicable to both solid and powder samples and gives a precision of at least ±0.00025 A. The most important step in the analysis is the align…
Abstract The ‘wet’ carbonatation of calcium hydroxide has been compared at 22° and 95° to determine the effect of temperature on the rate of formation, solubility and subsequent rate of ageing of the products, as indicated by changes in lattice structure and in surface area and average crystallite size. Direct precipi…
Procedures for the preparation of aluminum, stainless steel, and magnesium for adhesive bonding have been developed, together with illustrative data showing the reliability of results. The lap joint shear test at room temperature was used as the criterion. The testing procedures, equipment used, and process variables…
C. F. H. Tipper and R. K. Williams, Trans. Faraday Soc., 1961, 57, 79 DOI: 10.1039/TF9615700079
The melting of a solid always implies a transition from a state of com-paratively high order to one of comparative disorder. A measure of the increase of disorder or randomization on melting is given by the Boltzmann relationship
Abstract The preparation of a homologous series of eighteen poly(vinyl alkyl ethers) by cationic solution polymerization is reported. Physical and mechanical properties of the polymer were found to be highly dependent on the size or bulkiness of the alkyl side chain. Thus, poly(vinyl alkyl ethers) having highly branch…
Thin oxide whiskers have been found to grow on copper by a number of investigators. The relation of these growths to the mechanism of oxidation and to changes in the kinetics of oxidation remains to be established. To answer these questions a study was made of the oxidation of copper using the vacuum microbalance meth…
Al2CO has a long-range disordered structure based on the wurtzite lattice and a short-range √3a, 2c superstructure. The long-range atomic parameters were determined from the single crystal sharp diffraction data with Mo K radiation. The diffuse spectra, although very apparent on the single-crystal x-ray photographs, w…
R. Heiligman-Rim, Y. Hirshberg and E. Fischer, J. Chem. Soc., 1961, 156 DOI: 10.1039/JR9610000156
Abstract Aus 21 heterocyclischen Dicarbonsäuren wurden lineare Polyamide hergestellt. Kondensationen durch Schmelzen von Hexamethylendiammoniumsalzen waren ungünstig, da die Produkte decarboxylierten, während Kondensationen über Ester etwas bessere Resultate gaben. Einige Salze ließen sich überhaupt nicht kondensieren…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifferential Thermal Analysis and Thermogravimetric Analysis of Fission Product Oxides and Nitrates to 1500° C.P. F. Campbell, M. H. Ortner, and C. J. AndersonCite this: Anal. Chem. 1961, 33, 1, 58–61Publication Date (Print):January 1, 1961Publication History Published onlin…
C. D. Clark, P. J. Kemmey and E. W. J. Mitchell, Discuss. Faraday Soc., 1961, 31, 96 DOI: 10.1039/DF9613100096
Abstract A survey is given of the existing methods for measuring the surface tension from the geometry of sessile drops. These methods, which generally consist of the measurement of simple drop dimensions, are insufficiently accurate for use with adsorption studies. A new procedure is described to find the surface ten…