Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactive Flame Retardants for Polyurethane FoamsAnthony J. PapaCite this: Ind. Eng. Chem. Prod. Res. Dev. 1970, 9, 4, 478–496Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published inissue 1 December 1970https://pubs.acs.org/doi/10.10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structures of low-spin, square-pyramidal complexes of nickel(II)Harry B. Gray and James R. PreerCite this: J. Am. Chem. Soc. 1970, 92, 25, 7306–7312Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published inissue 1 December…
Abstract The solubility of carbon in sodium over the range 600‐950° may be expressed by the equation: log sol. = 7.20‐5465/T where solubility is in ppm and T in °K. From plots of carbon activity versus concentration, and from observations that oxygen does not affect carbon solubility, it is proposed that carbon dissol…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemical rearrangements of metal tris-.beta.-diketonates. I. Partial resolution and racemization of some tris(acetylacetonates)Robert C. Fay, Amal Y. Girgis, and Ulrich KlabundeCite this: J. Am. Chem. Soc. 1970, 92, 24, 7056–7060Publication Date (Print):December 1, 197…
The temperature and concentration dependences of the visible emission of ${\mathrm{Er}}^{3+}$ in Y${\mathrm{F}}_{3}$ under infrared excitation of the $^{4}I_{\frac{11}{2}}$ levels have been measured. The infrared radiation is absorbed by ions initially in the ground state and two excitations subsequently combine, yiel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectroscopy of proline oligomers and poly-L-prolineAlan G. Walton, W. B. Rippon, and Jack L. KoenigCite this: J. Am. Chem. Soc. 1970, 92, 25, 7455–7459Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published inissue 1 December 1…
The compressibility of α lead azide, β lead azide, barium azide, potassium azide, sodium azide, and thallium azide have been measured by single-crystal x-ray diffraction techniques for the first time in a new application of the diamond anvil pressure cell. Both the anisotropic and volume compressibilities are reported…
The distribution of the values of the dihedral angles (χj) in the side group conformations of various amino acid residues in the three proteins myoglobin, lysozyme and tosyl‐α.‐chomotrypsin has been analysed. The observations in these protein structures are found to agree well with the theoretical distribution worked…
The ferroelectric transition in K${\mathrm{D}}_{2}$P${\mathrm{O}}_{4}$ has been investigated both experimentally and theoretically. Coherent neutron scattering by fluctuations associated with the transition was studied both above and below the transition temperature. None of the optic-phonon modes was found to change…
This paper is a review of existing knowledge on cavitation nuclei. The lack of significant tensions in ordinary liquids is due to so-called weak spots or cavitation nuclei. The various forms which have been proposed for nuclei are gas bubbles, gas in a crevice, gas bubble with organic skin, and a hydrophobic solid. Th…
The wetting of AlN and TiC by liquid Ag and liquid Cu was investigated by the sessile drop technique at 10 −6 torr or less. An empirical relation was established between the cosine of the contact angle and the temperature or surface tension of the liquid drop. The critical surface tension for spreading and its physica…
Abstract The breakdown mechanism of an aromatic polyamide and four polyimides has been studied under vacuum in the temperature range of 375–620°C, by using techniques described earlier, involving collection and analysis of volatile products as well as analyses of residues at different temperatures. The decomposition o…
The strong temperature dependence of the flow stress of body-centred cubic metals at temperatures below ∼0·1 Tm has generally been attributed to the inherent lattice friction of the b.c.c. structure (the Peierls stress). To test this hypothesis, very high purity (with regard to interstitials) tantalum single crystals…
The low‐temperature viscosities of two series of sodium aluminosilicate glasses were measured by the fiber elongation method. The results suggested that a modification of the Day and Rindone structural model for sodium aluminosilicate glasses was necessary. The modified model suggests that additional (AlO ½ ) − groups…
The present paper, dealing with nylons 66, 610, and 612, is part of a study on a series of polyamides as crystallized from solution. The lath-shaped crystallization products, aggregated in the form of sheaves, possess the characteristics of chain-folded single crystals. In particular, they can be collected in the form…
By use of Fourier-integral representations and lattice orthogonality relations, Madelung sums are cast in a form which explicitly separates contributions due to crystal symmetry from those due to the detailed arrangement of neighboring ions. The usefulness and mathematical soundness of the method are demonstrated by v…
Summary Pelitic rocks were followed from unmetamorphosed clays and marls of Upper Triassic and Lower Liassic to anchimetamorphosed phyllites of the Alpine border region in Switzerland. Phengite and Al‐rich chlorite formed from mixed‐layer illite/montmorillonite; pyrophyllite from kaolinite. For the formation of parago…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of enzymic formation of homogentisate from p-hydroxyphenylpyruvateBengt Lindblad, Goran Lindstedt, and Sven LindstedtCite this: J. Am. Chem. Soc. 1970, 92, 25, 7446–7449Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published…
Abstract The crystallization of elemental selenium has been studied in light of present concepts of crystallization in organic polymers. Bulk‐crystallization kinetic data as measured by a dynamic density technique and spherulite growth‐rate data as measured by optical microscopy are presented for the temperature range…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of rare earth antimonate pyrochlores and cathodoluminescence of europium(3+) in 3Gd2O3.Sb2O5D. K. NathCite this: Inorg. Chem. 1970, 9, 12, 2714–2718Publication Date (Print):December 1, 1970Publication History Published online1 May 2002Published inissue 1 December 1…