Materials Literature
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Abstract Commercial samples of high density, linear low density, and low density polyethylene were modified by injection of low concentrations of free radical initiator during extrusion. Molecular properties monitored included molecular weight distribution, degree of unsaturation, and branching. When the polyethylene…
A collagen-impregnated graft, called Hemashield, has been used clinically; however, some complications such as pyrexia, fluid accumulation, and unusual scar formation around the graft have been reported. To understand the cause of these problems, the graft was examined both in vivo and in vitro. Endotoxin and (1-3)bet…
Chemical Potential Diagrams for Fe‐Cr‐Li‐K‐C‐O System: Thermodynamic Analysis on Reaction Profiles Between Alloys and Alkali Carbonates, Yokokawa, Harumi, Sakai, Natsuko, Kawada, Tatsuya, Dokiya, Masayuki, Ota, Ken‐ichiro
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAntiferromagnetic coupling in the binuclear metal cluster of manganese-substituted phosphotriesteraseMyeong Yun Chae, George A. Omburo, Paul A. Lindahl, and Frank M. RaushelCite this: J. Am. Chem. Soc. 1993, 115, 25, 12173–12174Publication Date (Print):December 1, 1993Public…
Abstract Bulk and size-fractionated kaolinites from seven localities in Australia as well as the Clay Minerals Society Source Clays Georgia KGa-1 and KGa-2 have been studied by X-ray diffraction (XRD), laser scattering, and electron microscopy in order to understand the variation of particle characteristics across a r…
Abstract The structure refinement of a hastingsite (Cl 0.91 p.f .u.) from West Ongul Island, Ltitzow-Holm Bay, East Antarctica, has been carried out in order to characterise the effect of CI on the crystal structure. The composition of the Cl-rich hastingsite is K 0.69 Na 0.26 Ca 1.99 Mg 1.09 Fe 2+ 2.71 Fe 3+ 0.92 Mn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolydimethylsiloxane-urea-urethane copolymers with 1,4-benzenedimethanol as chain extenderTai Ho, Kenneth J. Wynne, and Robin A. NissanCite this: Macromolecules 1993, 26, 25, 7029–7036Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Publ…
The crystal structure of a triclinic (C1) Mg and Cr-rich clinochlore-IIb-4 from the Day Book Body, North Carolina, was determined by refinement of single crystal x-ray data at 550°C to R=0.083 and R w =0.084. Cell parameters were refined at 25, 100, 200, 300, 425, 500, and 550°C. The crystal was mounted using a new te…
Abstract A combined application of electron paramagnetic resonance (EPR) and Fourier-transform infrared (FTIR) spectroscopies with thermal methods was used to determine the chemical form of V(IV) in a Georgia kaolinite (KGa-I). Precise values of the EPR spectroscopic g-values and hyperfine coupling constants were obta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProtection and polymerization of functional monomers. 19. Synthesis of well-defined poly(ethynylstyrenes) by means of anionic living polymerization of (trimethylsilyl)ethynylstyrenesKatsuyuki Tsuda, Takashi Ishizone, Akira Hirao, Seiichi Nakahama, Toyoji Kakuchi, and Kazuaki…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectroscopic study of the formation of barium titanate from an oxalate precursorPrabir K. Dutta, P. K. Gallagher, and Jen TwuCite this: Chem. Mater. 1993, 5, 12, 1739–1743Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published…
In the Canadian research and development program on fuel storage, used CANDU (Canada deuterium uranium) UO2fuel bundles are being exposed in experimental vessels to both dry and moisture-saturated air environments at 150°C. At intervals of several years, individual fuel elements, which were deliberately defected befor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReductive deposition of palladium on porous silicon from aqueous solutions of palladium dichloride: an x-ray absorption fine structure studyI. Coulthard, D. T. Jiang, J. W. Lorimer, T. K. Sham, and X. H. FengCite this: Langmuir 1993, 9, 12, 3441–3445Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of organocobalt porphyrin complexes from reactions of cobalt(II) porphyrins and dialkylcyanomethyl radicals with organic substrates: chemical trapping of a transient cobalt porphyrin hydrideAlexei A. Gridnev, Steven D. Ittel, Michael Fryd, and Bradford B. WaylandCi…
The role of lysine 153 in the action of UDP-galactose 4-epimerase from Escherichia coli has been investigated by site specific mutagenesis and kinetic and spectrophotometric analysis of the mutant enzymes. The crystal structure of UDP-galactose 4-epimerase shows that the binding of NAD+ to the coenzyme site includes t…
Brillouin light scattering was used to obtain elastic and piezoelectric constants for a single domain orthorhombic KNbO3 single crystal at room temperature and pressure. More than 320 measurements of longitudinal and transverse acoustic wave velocities were obtained in 160 different crystallographic directions. An inv…
Abstract Liquid-crystalline benzoic acid derivatives, 4-pentylbenzoic acid and 4-hexylbenzoic acid, have been examined by infrared spectroscopy. These benzoic acids show nematic phases. In the crystalline state, only the dimeric form is observed. However, the monomeric non-hydrogen-bonded benzoic acid appears once the…
The pressure sensor proposed by Shen, Gregorian & Holzapfel [ High Press. Res. (1991), 7 , 73–75], based on the pressure-dependent shift of the luminescence line due to the 5 D 0 − 7 F 0 electronic transition of Sm 2+ in a matrix of BaFCl, has been tested in a diamond-anvil cell and calibrated against the R 1 − R…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of high-molecular-weight poly(phenylene sulfide) by oxidative polymerization via poly(sulfonium cation) from methyl phenyl sulfoxideEishun Tsuchida, Eiichi Shouji, and Kimihisa YamamotoCite this: Macromolecules 1993, 26, 26, 7144–7148Publication Date (Print):Decemb…
A simple isothermal constitutional mechanism is proposed to explain the oscillatory compositional zoning observed in many natural crystals. The model is based on the diffusion equation in an open system and realistic crystal-growth kinetics. A phenomenological partitioning coefficient K is introduced to relate the com…