Materials Literature
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Abstract Single‐crystal x‐ray diffraction analysis is performed on a model compound (bisurethane of diphenylmethane‐4–monoisocyanate and butanediol‐1,4) for the thermoplastic polyurethane (TPU) hard segment formed from diphenylmethane‐4,4′‐diisocyanate and butanediol‐1,4. The resulting structure is compared to structu…
Abstract The nuclear cobalt(II) ion in heptamethyl cobyrinate iodide, Cob(II)ester·I, was found to assume a distorted square-planar geometry of Co–N4 type with iodide as a counterion in a polar solvent (methanol) and a square-pyramidal one of Co–N4I type with the iodide ion coordinated at one of the axial positions in…
The temperature dependence of Young's modulus and internal friction (Q −1 )in alumina, silicon nitride, and partially stabilized zirconia (Y‐PSZ) ceramics was studied. Little change in Q −1 was found for alumina, whereas Q −1 for silicon nitride ceramics increased above 700°C. The Q −1 of Y‐PSZ increased markedly with…
The extrapallial fluid (EPF), the fluid component of the shell-forming system of molluscs, has been examined for its effect on the rate of CaCO3 crystal formation in vitro. The medium was an artificial inorganic extrapallial fluid supersaturated with respect to CaCO3. EPF of the bivalves Crassostrea virginica and Merc…
A model is proposed for the geometrical structure of graphitic carbon chemisorbed on a Ni(110) single crystal which reproduces with good accuracy the experimental radial distribution function $F(R)$ obtained for the first time by surface extended energy-loss fine-structure spectroscopy. The graphitic layer strongly in…
Strain SF22, a glutamine-requiring (Gln-) mutant of Bacillus subtilis SMY, is likely to have a mutation in the structural gene for glutamine synthetase, since this strain synthesized 22 to 55% as much glutamine synthetase antigen as did wild-type cells in a 10-min period but had less than 3% of wild-type glutamine syn…
The corrosion of copper in neutral and acidic chloride solutions containing dissolved oxygen has been investigated by transient polarization techniques. Mathematical models have been developed to Interpret the current transients of copper due to potential variations. These models compare favorably with experimental re…
The strong tendency of the porphyrin framework to form permitted synthesis of the title compound 1 by successive reaction of biphenylenedicarbaldehyde with pyrrole and dipyrrylmethane derivatives. 1 forms a dicopper(II) complex with, as yet, unexplained properties.
Abstract The temperature, strain‐rate, and pressure dependences of the yield stress have been determined for two polyethylene homopolymers of differing molecular weights and for a polyethylene copolymer. Samples were prepared by slowly cooling from the melt, and also by quenching in order to assess the effects of morp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin-state differences and spin crossover in five-coordinate Lewis base adducts of cobalt(II) Schiff base complexes. Structure of the high-spin (N,N'-o-phenylenebis(salicylaldiminato))cobalt(II)-2-methylimidazole adductBrendan J. Kennedy, Gary D. Fallon, Bryan M. K. C. Gateh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetramesitylcyclodisiloxane: a cyclic siloxane with an unusual structureMark J. Fink, Kenneth J. Haller, Robert West, and Josef MichlCite this: J. Am. Chem. Soc. 1984, 106, 3, 822–823Publication Date (Print):February 1, 1984Publication History Published online1 May 2002Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass transition for amorphous solid waterD. R. MacFarlane and C. A. AngellCite this: J. Phys. Chem. 1984, 88, 4, 759–762Publication Date (Print):February 1, 1984Publication History Published online1 May 2002Published inissue 1 February 1984https://doi.org/10.1021/j150648a02…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalyst preparation procedure probed by EXAFS spectroscopy. 1. Nickel on silicaKazuyuki Tohji, Yasuo Udagawa, Shuji Tanabe, and Akifumi UenoCite this: J. Am. Chem. Soc. 1984, 106, 3, 612–617Publication Date (Print):February 1, 1984Publication History Published online1 May 2…
Abstract Polycations of limited molecular size were prepared from 0.1 M solutions of Fe(III)(NO 3 ) 3 and A1(NO 3 ) 3 by ultrafiltration. Various amounts of the polycations were added to Na-kaolinite, Na-mont-morillonite, and a Na-soil clay and the effect on the flocculation of the clay and electrophoretic mobility co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBioaccumulation of nickel by algaeHong Kang. Wang and John M. WoodCite this: Environ. Sci. Technol. 1984, 18, 2, 106–109Publication Date (Print):February 1, 1984Publication History Published online1 May 2002Published inissue 1 February 1984https://pubs.acs.org/doi/10.1021/es…
Neutron-diffraction experiments were performed on polycrystalline samples of $\ensuremath{\alpha}\ensuremath{-}{\mathrm{O}}_{2}$ at 6 and 22 K and on $\ensuremath{\beta}\ensuremath{-}{\mathrm{O}}_{2}$ at 30 K. A large amount of preferred orientation was observed in all samples. For the first time a quantitative analys…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic and EPR properties of bis(.mu.-azido)tetrakis(4-tert-butylpyridine)dicopper(II) perchlorate: a new copper(II) dinuclear complex with a large stabilization of the ground triplet stateSonia Sikorav, Itka Bkouche-Waksman, and Olivier KahnCite this…
Recent ion scattering spectroscopy (ISS) studies indicate that an excess of K ions occurs at the surface of a K 2 O · 3SiO 2 glass. Molecular dynamics (MD) computer simulations were used to evaluate the short‐time dynamic behavior of atoms at the surface of such a glass in order to determine a mechanism for the K ion…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDescription and analysis of hydroxyethyl celluloseJacques ReubenCite this: Macromolecules 1984, 17, 2, 156–161Publication Date (Print):February 1, 1984Publication History Published online1 May 2002Published inissue 1 February 1984https://pubs.acs.org/doi/10.1021/ma00132a007h…
The crystal structure and helical conformation of polybutene-1 crystallized from dilute solution is shown to be a function of the crystal structure before dissolution, the maximum temperature in solution attained before cooling to the crystallization temperature, and the time at that maximum temperature. The effect is…