Materials Literature
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The core structure of hedgehog point disclinations in magnetic and nematic liquid crystal systems is investigated within Landau theory. Exact spherically symmetric solutions are found, with isotropic cores. In the nematic hedgehog the solution is uniaxial everywhere. Nematic hedgehogs are very much larger than magneti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContrasting one- and two-cation binding behavior in syn- and anti-anthraquinone bibracchial podand (BiP) mono- and dianions assessed by cyclic voltammetry and electron paramagnetic resonance spectroscopyMilagros. Delgado, Deborah A. Gustowski, Hyunsook K. Yoo, Vincent J. Gat…
In Escherichia coli, a single operon encodes the metabolic and regulatory enzymes of the glyoxylate bypass. The metabolic enzymes, isocitrate lyase and malate synthase, are expressed from aceA and aceB, and the regulatory enzyme, isocitrate dehydrogenase kinase/phosphatase, is expressed from aceK. We cloned this opero…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntercalation of cationic, anionic, and molecular species by organic hosts. Preparation and crystal structure of [NH4]6[calix[4]arenesulfonate][MeOSO3].cntdot.(H2O)2Simon G. Bott, Anthony W. Coleman, and Jerry L. AtwoodCite this: J. Am. Chem. Soc. 1988, 110, 2, 610–611Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinitiated charge separation in a carotenoid-porphyrin-diquinone tetrad: enhanced quantum yields via multistep electron transfersDevens. Gust, Thomas A. Moore, Ana L. Moore, Donna. Barrett, Larry O. Harding, Lewis R. Makings, Paul A. Liddell, F. C. De Schryver, M. Van de…
Abstract Polysiloxanes with oligo‐oxyethylene side chains of the type —O(CH 2 CH 2 O) 7 CH 3 and —(CH 2 ) 3 O(CH 2 CH 2 O) n CH 3 (average n ≈ 7 and 11) were synthesized from poly(hydrogenmethylsiloxane) and characterized by 1 H n.m.r., 29 Si n.m.r., i.r. and g.p.c. Cyclic analogues were used as model compounds and sy…
The mechanical properties of ceramic brackets, particularly fracture toughness, are so different from those of metal brackets that their selection and handling requires a completely different set of criteria and techniques.
Abstract Addition type imide resins are finding increased use as matrix resins for advanced composites. Many different chemical approaches have been used to synthesize imide resins which are easy to process (similar to epoxies) but higher in temperature resistance. This paper outlines recent advances in thermosetting…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen bonding in polymer blends. 2. TheoryPaul C. Painter, Yung Park, and Michael M. ColemanCite this: Macromolecules 1988, 21, 1, 66–72Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 January 1988https://pubs.acs.o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of hydrophobically associating block polymersP. L. Valint Jr. and J. BockCite this: Macromolecules 1988, 21, 1, 175–179Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 January 1988https:/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIrregular spin state structure in trinuclear species: magnetic and EPR properties of manganese(II)-copper(II)-manganese(II) and nickel(II)-copper(II)-nickel(II) compoundsYu Pei, Yves Journaux, and Olivier KahnCite this: Inorg. Chem. 1988, 27, 2, 399–404Publication Date (Prin…
The relaxation processes responsible for the finite lifetime of excited vibrational states in molecular crystals are discussed on the basis of recent experimental and theoretical developments. Experimental information on the lifetime of optically active phonons is obtained in the time domain by time-resolved CARS spec…
The subject of the viscous and viscoelastic behavior of ionomer systems is addressed from a general point of view. Following some introductory material concerning terminology and characteristics of ionomers that are pertinent for later discussion, the format will be to first briefly consider the glassy state followed…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrediction of polymer crystal structures and properties: polyethylene and poly(oxymethylene)R. A. Sorensen, W. B. Liau, L. Kesner, and R. H. BoydCite this: Macromolecules 1988, 21, 1, 200–208Publication Date (Print):January 1, 1988Publication History Published online1 May 20…
We report here the X-ray crystal structure of native subtilisin Carlsberg, solved at 2.5 A resolution by molecular replacement and refined by restrained least squares to a crystallographic residual (Formula see text): of 0.206. we compare this structure to the crystal structure of subtilisin BPN'. We find that, despit…
Characteristic features of zig-zag defects and disclinations in surface-stabilized ferroelectric liquid crystal cells are presented. It is pointed out that there exist two kinds of zig-zag defects, i.e. , a lightning type and a hairpin type, which appear alternatively along the smectic layer normal. This fact indicate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn ethylene glycol derivative of boehmiteMasashi Inoue, Yasuhiko Kondo, and Tomoyuki InuiCite this: Inorg. Chem. 1988, 27, 2, 215–221Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 January 1988https://pubs.acs.org/doi…
Submicrometer-size droplets of monomeric liquid crystals dispersed in a solid polymer matrix are studied by deuterium NMR. Phase-separation processes are used to achieve droplets of a size comparable and less than the magnetic coherence length \ensuremath{\xi}\ensuremath{\sim}0.5 \ensuremath{\mu}m, of the NMR magnetic…
A variety of electron spectroscopic techniques has been used with model catalysts fabricated on single-crystal substrates to study charge transfer in the RhTiO2 system. In order to avoid the morphological changes and encapsulation that occur when catalysts are reduced at high temperatures to induce SMSI, TiO2 substrat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-ion conduction in poly[(oligo(oxyethylene)methacrylate)-co-(alkali-metal methacrylates)]Eishun Tsuchida, Hiroyuki Ohno, and Norihisa KobayashiCite this: Macromolecules 1988, 21, 1, 96–100Publication Date (Print):January 1, 1988Publication History Published online1 May…