Materials Literature
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Glutaraldehyde cross-linking of native or reconstituted collagen fibrils and tissues rich in collagen significantly reduces biodegradation. Other aldehydes are less efficient than glutaraldehyde in generating chemically, biologically, and thermally stable cross-links. Implants of collagenous materials cross-linked wit…
The preparation and characterization of machinable mica glass‐ceramics by the sol‐gel process are described. The thermal behavior of the precursor and the optimum conditions for calcination, molding, and sintering are given. Physical, chemical, thermal, electrical, and mechanical properties are investigated, and the m…
Beam broadening is discussed in the context of the standard formalism for multiple small-angle scattering, in which coherent single-particle scattering is incoherently, or stochastically, compounded by a random system of spherical particles in a uniform matrix. Bethe's analysis of scattering when sample thickness grea…
Electrochemical techniques were used for the study of crevice corrosion of two nickel-based alloys in aqueous solutions of 1 M NaCl and 1 M NaCl + 0.01 M Na2S2O3. Artificial metal/Teflon† crevices were used and principal testing temperatures ranged from 20 to 80 C. The studies were supplemented by anodic polarization…
Abstract not Available.
Colloidal dispersions have structure on length scales from 10 to 1000 Å. Both inter- and intraparticle scattering contribute to the measured small-angle scattering spectra. Here are reviewed methods of quantitatively analyzing scattering from interacting polydisperse colloidal suspensions. The concept of a colloidal m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeme model studies related to cytochrome P-450 reactions: preparation of iron porphyrin complexes with carbenes bearing a .beta.-oxygen atom and their transformation into iron-N-alkylporphyrins and iron-metallacyclic complexesIsabelle. Artaud, Nathalie. Gregoire, Jean Paul.…
Abstract Successive phase transitions were observed for CsSnBr3 and CH3NH3SnBr3 by means of 81Br NQR and DTA. These compounds are isomorphous with each other and have typical cubic perovskite structures at room temperature. However, with decreasing temperature both compounds showed successive phase transitions and com…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and chemistry of a dinuclear iridium bis-.mu.-oxo complex. Observation of oxygen transfer and phosphorus-carbon bond cleavageWilliam D. McGhee, Thomas. Foo, Frederick J. Hollander, and Robert G. BergmanCite this: J. Am. Chem. Soc. 1988, 110, 25, 8543–8545Publicatio…
Abstract Linear low density (LLDPE) and high density (HDPE) polyethylenes were reinforced with wood fibers of aspen chemithermomechanical (CTMP) pulp. The different isocyantes: (i) polymethylene (polyphenyl isocyanate), (ii) tolene –2–4‐diisocyanate, (iii) 1–6 hexamethylene‐diisocyanate, and (iv) ethyl isocyanate used…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic and electrical properties of VO(dmit)2 and V(dmit)3 anion complexes and x-ray crystal structure of [NMP]2[V(dmit)3] (dmit = 2-thioxo-1,3-dithiole-4,5-dithiolate, NMP = N-methylphenazinium)Genetsu Matsubayashi, Kazuki Akiba, and Toshio TanakaCite this: Inorg. Ch…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSorption and diffusion of alcohols in heteropoly oxometalates and ZSM-5 zeoliteV. S. Nayak and J. B. MoffatCite this: J. Phys. Chem. 1988, 92, 25, 7097–7102Publication Date (Print):December 1, 1988Publication History Published online1 May 2002Published inissue 1 December 198…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron donor-acceptor properties of porphyrins, phthalocyanines, and related ring chelates: a molecular orbital approachC. Fierro, A. B. Anderson, and D. A. SchersonCite this: J. Phys. Chem. 1988, 92, 24, 6902–6907Publication Date (Print):December 1, 1988Publication Histor…
Abstract Our previous publication on this subject has dealt with the processing history effects on the crystallization rate of nylon 6 from the molten state. In this manuscript we present some insights into the molecular origin of the observed effects. Based on the available experimental data, we hypothesize that melt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the thermal dehydration of potassium copper(II) chloride dihydrateHaruhiko Tanaka and Nobuyoshi KogaCite this: J. Phys. Chem. 1988, 92, 24, 7023–7029Publication Date (Print):December 1, 1988Publication History Published online1 May 2002Published inissue 1 Decembe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleFormation of highly oriented graphite from poly(acrylonitrile) prepared between the lamellae of montmorilloniteNaohiro Sonobe, Takashi Kyotani, Yoshihiro Hishiyama, Minoru Shiraishi, and Akira TomitaCite this: J. Phys. Chem. 1988, 92, 24, 7029–7034Publication Date (Print):Decemb…
The synthesis is reported of fifteen three-ring 2,5-disubstituted pyridines and two pyridine-N-oxides where the pyridine rings carry a variety of alkyl, aryl, cyclohexyl, cyclohexylethyl and fluorinated-aryl substituents. The mesomorphic transition temperatures for these compounds have been measured; all the compounds…
A mean-field Green function theory is developed for investigating the dynamics of entangled rod-like polymers in solutions. We regard the hindrance of surrounding rods as a multiple (sequential) perturbation to the free transverse or lateral diffusion of a test rod (a rod in consideration) and incorporate the effects…
The atomic and electronic structures of amorphous and crystalline Mg-Zn alloys are studied by computer simulation, electronic band-structure calculations and photoemission measurements. The spectra for the metallic glasses and for pure crystalline zinc show a narrow band of Zn 3d states centred at a binding energy E B…
Abstract The oxygen glow discharge plasma modification of a contact lens material has been studied using SSIMS. SSIMS provides evidence at the molecular level for the conversion of surface organosiloxane species to inorganic silica functionalities with treatment time. These findings shown an excellent correlation with…