Materials Literature
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A Longoni-Chini cluster, [Ptl5(C0),l2-, was prepared on MgO powder by a surfacemediated synthesis from Na2PtCb\nin the presence of CO. The formation of [Pt15(CO)30]2a-n d its decarbonylation at 120 'C under vacuum were characterized\nby infrared and X-ray absorption spectroscopies. The decarbonylated cluster had an av…
Boron doped zinc oxide films were deposited by atmospheric pressure chemical vapor deposition in a laminar flow reactor from diethyl zinc, tert‐butanol, and diborane in the temperature range from 300 to 420°C. When the deposition temperature was above 320°C, both doped and undoped films have highly oriented crystallit…
A recently proposed microplane model, which describes not only cracking but also general nonlinear triaxial response, is extended to cyclic loading and the rate effect, and is implemented in a three‐dimensional finite element code. The material properties are characterized separately on planes of various orientations…
Contrasting the flow response of aqueous dispersions of colloidally stable polymer particles with dispersions controlled only by hydrodynamic interactions, we find that the hydrodynamic interactions are still a major factor, but colloid chemical forces can modify the response in important ways. For example, at solids…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonequilibrium liquid-liquid phase separation in crystallizable polymer solutionsHwan K. Lee, Allan S. Myerson, and Kalle LevonCite this: Macromolecules 1992, 25, 15, 4002–4010Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAspects of the solution chemistry of trans-diammineplatinum(II) complexesTrevor G. Appleton, Alicia J. Bailey, Kevin J. Barnham, and John R. HallCite this: Inorg. Chem. 1992, 31, 14, 3077–3082Publication Date (Print):July 1, 1992Publication History Published online1 May 2002…
A characterization of rubbed polystyrene (PS) film in terms of the optical retardation measurement as a function of the rubbing strength (RS) has been made, and the alignment capability of the rubbed PS films for a nematic liquid crystal (5CB) has been investigated by measuring anchoring strength and its temperature d…
A density-modification procedure for phase extension and refinement is described which replaces all density less than one-fifth of the height of a light-atom peak by zero. Its effectiveness is demonstrated by applications to a small and a medium-size protein structure. With high-resolution data, for the small protein,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of cyclic liquid crystalline oligomers based on 1-(4-hydroxy-4'-biphenylyl)-2-(4-hydroxyphenyl)butane and 1,10-dibromodecaneV. Percec, M. Kawasumi, P. L. Rinaldi, and V. E. LitmanCite this: Macromolecules 1992, 25, 15, 3851–3861Publication Date…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural role of water in sodium silicate glasses: results from silicon-29 and proton NMR spectroscopyJoerg Kuemmerlen, Lawrence H. Merwin, Angelika Sebald, and Hans KepplerCite this: J. Phys. Chem. 1992, 96, 15, 6405–6410Publication Date (Print):July 1, 1992Publication Hi…
Abstract This study is based on the use of integral, hybrid thermal barrier to protect the core of the composite structure. Thermal barrier treatments evaluated in this study include ceramic fabric, ceramic coating, intumescent coating, hybrid of ceramic and intumescent coating, silicone foam, and phenolic skin. The c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, properties, and the ring-ring transformation reactions of cyclic siloxanes incorporating skeletal boron atoms: x-ray crystal structures of the strained boracyclotrisiloxane (PhBO)(Ph2SiO)2 and the boracyclotetrasiloxane (PhBO)(Ph2SiO)3Daniel A. Foucher, Alan J. Lo…
A 5417-base pair (bp) region of Pseudomonas aeruginosa PAO chromosomal DNA containing the mmsAB operon and an upstream regulatory gene (mmsR) has been cloned and characterized. The operon contains two structural genes involved in valine metabolism: mmsA, which encodes methylmalonate-semialdehyde dehydrogenase; and mms…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal synthesis of a layered zinc molybdenum phosphate with octahedral and tetrahedral zinc: structure of (TMA)2(H3O)2[Zn3Mo12O30(HPO4)2(H2PO4)6].cntdot.11.5H2OLinda A. Mundi and Robert C. HaushalterCite this: Inorg. Chem. 1992, 31, 14, 3050–3053Publication Date (Prin…
Physical properties of the phenomena occurring in one-dimensional systems structure and properties of conducting organic crystals structure and properties of conducting polymers methods of obtaining low-dimensional organic conductors structure, properties and applications of heterogeneous organic molecules and molecul…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN-(tert-Butoxycarbonyl)-2-(tert-butyldimethylsiloxy)pyrrole: a promising compound for synthesis of chiral nonracemic hydroxylated pyrrolidine derivativesGiovanni Casiraghi, Gloria Rassu, Pietro Spanu, and Luigi PinnaCite this: J. Org. Chem. 1992, 57, 14, 3760–3763Publication…
ABSTRACT Citrus oil components (from cold‐pressed and terpeneless oils), which contribute substantially to flavor of orange juice, were shown to be absorbed into various polymeric materials [low density polyethylene (LDPE), high density polyethylene (HDPE), polypropylene (PP), and surlyn (S)] used in aseptic packaging…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemiempirical calculations of hyperpolarizabilities for donor-acceptor molecules: comparison to experimentNobuyuki Matsuzawa and David A. DixonCite this: J. Phys. Chem. 1992, 96, 15, 6232–6241Publication Date (Print):July 1, 1992Publication History Published online1 May 2002…
Singlet oxygen (1O2) can react with cholesterol (Ch) to give three possible ene-addition hydroperoxides: 3 beta-hydroxy-5 alpha-cholest-6-ene-5-hydroperoxide (5 alpha-OOH), 3 beta-hydroxycholest-4-ene-6 alpha-hydroperoxide (6 alpha-OOH), and 3 beta-hydroxycholest-4-ene-6 beta-hydroperoxide (6 beta-OOH). The rates of d…
Spinodal decomposition of off-critical mixtures of poly(styrene–random–butadiene) copolymer with polyisoprene or polybutadiene was investigated as a function of the composition w of the mixtures and of the phase separation temperature T by time-resolved light scattering. The coarsening behavior of the mixtures was cha…