Materials Literature
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Abstract A mathematical method has been developed, together with a digital computer program for its evaluation, for the determination of possible conformations of a polypeptide chain for any given amino acid sequence. Allowed conformations were required to satisfy predetermined criteria regarding the locations of pote…
ADVERTISEMENT RETURN TO ISSUEPREVArticlePhototropy (or Photochromism)Richard Exelby and Roger GrinterCite this: Chem. Rev. 1965, 65, 2, 247–260Publication Date (Print):April 1, 1965Publication History Published online1 May 2002Published inissue 1 April 1965https://pubs.acs.org/doi/10.1021/cr60234a005https://doi.org/10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Macromolecular Chemistry of Gelatin.Peter H. von HippelCite this: J. Am. Chem. Soc. 1965, 87, 8, 1824Publication Date (Print):April 1, 1965Publication History Published online1 May 2002Published inissue 1 April 1965https://pubs.acs.org/doi/10.1021/ja01086a059https://doi.…
A microscopic theory of ferroelectricity is developed in which the temperature dependence of the normal modes of vibration arises from the anharmonic interactions between those normal modes. The conditions for the stability of the crystal are discussed and detailed expressions given for the physical properties of both…
The oxidation‐reduction equilibria in molten glasses having a soda/silica ratio of 1/2 and containing small amounts of variable‐valence ions of the transition elements titanium, vanadium, iron, cobalt, and nickel, the post‐transition elements tin and antimony, and the rare‐earth element cerium were obtained by equilib…
A survey of the optical and E.P.R. absorption in a large number of diamonds revealed that most natural diamonds contain substitutional nitrogen exclusively in non-paramagnetic, platelet form. These diamonds are classified as Type I a. A small group of transparent natural diamonds contain dispersed, paramagnetic nitrog…
Abstract Aromatic diamines react with pyromellitic dianhydride in solvents such as dimethyl‐acetamide to form solutions of high molecular weight polyamic acids. These soluble polymers can be converted to insoluble aromatic polyimides. The aromatic polyimides exhibit zero strength temperatures above 700°C. and possess…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplexes Derived from Strong Field Ligands. XIX. Magnetic Properties of Transition Metal Derivatives of 4,4',4",4'''-TetrasulfophthalocyanineJames H. Weber and Daryle H. BuschCite this: Inorg. Chem. 1965, 4, 4, 469–471Publication Date (Print):April 1, 1965Publication Histor…
Abstract Investigations of the dynamic cut growth behavior of vulcanized rubbers indicate that there is a minimum tearing energy at which mechanical rupture of chains occurs. The limiting value is characteristic of each vulcanizate, but is in the region of 0.05 kg./cm. The mechanical fatigue limit, below which the num…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbametallic Boron Hydride Derivatives. I. Apparent Analogs of Ferrocene and Ferricinium IonM. Frederick Hawthorne, Donald C. Young, and Patrick A. WegnerCite this: J. Am. Chem. Soc. 1965, 87, 8, 1818–1819Publication Date (Print):April 1, 1965Publication History Published o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Occurrence of Metastable Tetragonal Zirconia as a Crystallite Size EffectRonald C. GarvieCite this: J. Phys. Chem. 1965, 69, 4, 1238–1243Publication Date (Print):April 1, 1965Publication History Published online1 May 2002Published inissue 1 April 1965https://pubs.acs.org…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Isoelectric Points of Solid Oxides, Solid Hydroxides, and Aqueous Hydroxo Complex SystemsGeorge A. ParksCite this: Chem. Rev. 1965, 65, 2, 177–198Publication Date (Print):April 1, 1965Publication History Published online1 May 2002Published inissue 1 April 1965https://pub…
Received 15 February 1965DOI:https://doi.org/10.1103/PhysRevLett.14.497©1965 American Physical Society
Abstract The kinetics of the polymerization of δ‐valerolactone initiated with ethylene glycol or monoethanolamine has been studied. An activation energy of 6.4 kcal./mole was obtained, and the mechanism of polymerization was also discussed. Though the produced polymer, a polyester with two alcoholic end‐groups, is eas…
The anisotropic Knight shift of the ${\mathrm{Sc}}^{45}$ and ${\mathrm{Y}}^{89}$ nuclear magnetic resonances (nmr) in polycrystalline scandium and yttrium metal, respectively, has been observed and measured at room temperature by means of the magnetic field dependence of the \textonehalf{} \ensuremath{\leftrightarrow}…
For a single d electron in a trigonal environment, the complete ligand-field Hamiltonian, including the interactions with the upper states of the cubic splitting, has been diagonalized in order to re-examine critically the theory of the EPR spectra of various Ti3+ compounds. The compounds for which there are adequate…
The existence of multiple-band conduction in $n$-type rutile for temperatures above \ensuremath{\approx}40\ifmmode^\circ\else\textdegree\fi{}K is deduced from studies of the Hall coefficients and electrical conductivities from \ensuremath{\approx}2 to 600\ifmmode^\circ\else\textdegree\fi{}K. This investigation emphasi…
The validity of the zero differential overlap approximation is investigated by means of a systematic expansion in terms of a parameter of the order of magnitude of a typical overlap integral between neighboring atoms. The terms of the Fock operator in a basis of orthogonal atomic orbitals can be arranged after differe…
The band structure of metallic face-centered cubic TiC, TiN, and TiO has been obtained by the augmented-plane-wave (APW) method at the equivalent of 256 points in the Brillouin zone and for an energy range appropriate to cover the nonmetal $2s$ and $2p$ and the titanium $3d$ and $4s$ states. A density of states, the F…
Control of oxygen fugacities in a CO + CO atmosphere has been established experimentally by using a solid-phase buffer technique. Equilibration between the buffer and the enclosed sample is established by diffusion of the gas atmosphere through the buffer. The establishment of equilibrium by this method is indicated b…