Materials Literature
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Abstract The known method of surface treatment of poly(tetrafluoroethylene) (Teflon) by alkali metals was studied quantitatively. It was shown that the reaction proceeds by an electrochemical mechanism in solid phase. The alkali metal acts as anode and Teflon as a cathodic active material of a typical galvanic corrosi…
Abstract. According to well‐known formulae for the mechanics of flexure stresses, the force required to snap a test specimen of uniform rectangular cross‐section is inversely proportional to its length and directly proportional to the width and the square of the thickness. For a specimen of circular cross‐section, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic spectral study of some iron(II) magnetic isomers in solution and a spectral-structural correlation with their nickel(II) analogsLon J. Wilson, Danae. Georges, and Mitchell A. HoseltonCite this: Inorg. Chem. 1975, 14, 12, 2968–2975Publication Date (Print):December…
Abstract In the initial stage of the development of transcrystallinity, nuclei appear sporadically on the substrate. The growth rate and melting temperature of the transcrystalline region are found to be the same as those of spherulites nucleated in the bulk of the polymer. Nucleation densities n s at the interface, a…
Abstract The dynamic mechanical properties of thermoplastic urethane elastomers have been compared for materials based on different diisocyanate structures, either 4,4′‐diphenylmethane diisocyanate (MDI) or an isomeric ratio of tolylene diisocyanate (TDI). Two comparable series of polymers were prepared with a polycap…
Type material of Skeletonema subsalsum has been examined by light and electron microscopy. The species belongs to Skeletonema and is not conspecific with Stephanodiscus subsalsus. Skeletonema subsalsum is distinguished from S. costatum morphologically mainly by structure of connecting processes, those of S. subsalsum…
The dielectric constants and two elastic constants were measured for a series of mixtures of two nematic liquid crystals, MBBA and PEBAB. The materials covered the range from 0 to 10% PEBAB. The parameters were calculated from the measured voltage dependence of capacitance. The dielectric constants vary linearly with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 and proton nuclear magnetic resonance spectra of some pentacyanoferrate(II) complexesJohn M. Malin, Charles F. Schmidt, and Henrique E. TomaCite this: Inorg. Chem. 1975, 14, 12, 2924–2928Publication Date (Print):December 1, 1975Publication History Published online1…
The valve morphology of the brackish-water plankton diatom Skeletonema subsalsum is dependent on salinity. In cells grown at salinities of 3‰ or less, the valve faces were flat and the connecting processes much reduced in length. Cells grown at salinities of 5‰ or higher had dome-shaped valves and extended connecting…
The field dependence of the proton NMR second moment ${M}_{2}(H, T)$ of powder N-methylphenazinium-tetracyanoquinodimethane (NMP-TCNQ) and (DMP-TCNQ), the analogous material with a deuterated methyl, shows that at 4.2\ifmmode^\circ\else\textdegree\fi{}K there are unpaired electrons localized on \ensuremath{\sim} 6% of…
The corrosion of copper in oxygenated sulfuric acid solutions was studied by means of weight‐loss and polarization curves. At a given potential, the rate of copper dissolution is greater in the presence than in the absence of oxygen reduction, which is contrary to the conventional theory of mixed potentials. An explan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganocobalt cluster complexes. XVIII. Friedel-Crafts acylation of diarylacetylenedicobalt hexacarbonyl complexes. Dicobalt hexacarbonyl unit as a protecting group for the acetylene functionDietmar Seyferth, Mara O. Nestle, and Anthony T. WehmanCite this: J. Am. Chem. Soc. 1…
It is shown that it is necessary to use an angle-dependent doublet separation within a given profile when performing an α2 elimination in X-ray diffraction line profiles. Two formulations for the doublet separation are suggested, which give better results than the doublet separation as obtained from a differentiation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixing of ionic and covalent configurations for sodium hydride, potassium hydride, and hydromagnesium(1+). Potential energy curves and couplings between molecular statesRobert W. Numrich and Donald G. TruhlarCite this: J. Phys. Chem. 1975, 79, 25, 2745–2766Publication Date (…
Rotational analyses have been carried out, with varying degrees of completeness, for nine bands of S 16 O 2 and two bands of S 18 O 2 in the region 3000–3300 Å. The bands are all highly perturbed type C bands, which go to b 2 vibrational levels of the ππ* Ã 1 A 2 electronic state. The [Formula: see text] electronic tr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonparameterized molecular orbital calculations of ligand-bridge Fe2(CO)6X2-type dimers containing metal-metal interactionsMichael B. Hall, Richard F. Fenske, and Lawrence F. DahlCite this: Inorg. Chem. 1975, 14, 12, 3103–3117Publication Date (Print):December 1, 1975Publicat…
A model, proposed originally by Dexter, Klick and Russell, is used to explain the occurence or non-occurence of F-center luminescence in ionic crystals, in terms of a simple two-state configuration coordinate diagram. In this model, which works for all known cases, luminescence is quenched by a competing non-radiative…
Neutron-elastic-scattering experiments performed on deuterated TTF-TCNQ single crystals reveal two structural transformations at 38 \ifmmode\pm\else\textpm\fi{} 0.5 K and at 54 \ifmmode\pm\else\textpm\fi{} 1.0 K. Below 38 K, a $4\stackrel{\ensuremath{\rightarrow}}{\mathrm{a}}\ifmmode\times\else\texttimes\fi{}3.4\stack…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of temperature on optical basicity in the sodium oxide-boric oxide glass systemJ. A. Duffy and R. J. GrantCite this: J. Phys. Chem. 1975, 79, 25, 2780–2784Publication Date (Print):December 1, 1975Publication History Published online1 May 2002Published inissue 1 Decemb…
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