Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeminal Delocalization of .sigma.-Electrons and Ring StrainsSatoshi Inagaki, Yoshifumi Ishitani, and Takuo KakefuCite this: J. Am. Chem. Soc. 1994, 116, 13, 5954–5958Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Soluble Alternating Aromatic CopolyimidesJ. W. Park, M. Lee, M.-H. Lee, J. W. Liu, S. D. Kim, J. Y. Chang, and S. B. RheeCite this: Macromolecules 1994, 27, 13, 3459–3463Publication Date (Print):June 1, 1994Publication History Published onli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescent Dinuclear Complexes Containing Ruthenium(II)- and Osmium(II)-Terpyridine-type Chromophores Bridged by a Rigid Biscyclometalating LigandMarc Beley, Sandrine Chodorowski, Jean-Paul Collin, Jean-Pierre Sauvage, Lucia Flamigni, and Francesco BarigellettiCite this: In…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompetitive Adsorption Kinetics of Polymers Differing in Length OnlyJ. C. Dijt, M. A. Cohen Stuart, and G. J. FleerCite this: Macromolecules 1994, 27, 12, 3219–3228Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 199…
Abstract This paper describes the nonisothermal crystallization of molten blends of two semicrystalline polymers, polypropylene (PP) and Nylon‐6 (N6). A discussion details the effect of the concentration of the compatibilizing agent, maleic anhydride grafted polypropylene (MAH‐ g ‐PP), on the crystallization behavior.…
Absorbable fibers of linear poly-alpha-hydroxy acids have been used successfully in providing temporary scaffolds for tissue regeneration. In some surgical applications, degradation rates for poly(glycolide) (PGA) are too high, but implants of poly(L-lactide) (PLLA) fibers may degrade too slowly for optimal function.…
Abstract This paper compares the results of 27 Al nuclear magnetic resonance spectroscopy (NMR) and Al-K-edge X-ray Absorption Near Edge Structure (XANES) of natural imogolite and allophanes and some crystalline reference minerals. All soil allophanes studied contain 4-coordinated Al (Al IV ). The highest relative pro…
The crystallographic structure of BaTiO 3 particles prepared by conventional solid‐state reaction has been investigated by X‐ray diffractometry and dielectric measurements. The systematic analysis of the diffraction pattern has clearly shown the coexistence of tetragonal and cubic phases at room temperature. The relat…
Proteins of the glucose-starvation stimulon were identified by using two-dimensional gel electrophoresis and the gene-protein database of Escherichia coli. Members of this stimulon included enzymes of the Embden-Meyerhof-Parnas (EMP) pathway, phosphotransacetylase (Pta) and acetate kinase (AckA) of the acetyl phosphat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleFerromagnetic Interactions in the First Bis(.mu.-end-on-azido)manganese(II) Dinuclear Compound: [Mn(terpy)(N3)2]2.cntdot.2H2ORoberto Cortes, J. Luis Pizarro, Luis Lezama, M. Isabel Arriortua, and Teofilo RojoCite this: Inorg. Chem. 1994, 33, 12, 2697–2700Publication Date (Print)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-Assembling Porphyrin [2]-CatenanesMaxwell J. Gunter, David C. R. Hockless, Martin R. Johnston, Brian W. Skelton, and Allan H. WhiteCite this: J. Am. Chem. Soc. 1994, 116, 11, 4810–4823Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Pub…
We have measured low-frequency Raman scattering (RS) spectra of the glass formers ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$, glycerol, m-tricresyl phosphate (m-TCP), and ${\mathrm{K}}_{3}$${\mathrm{Ca}}_{2}$(${\mathrm{NO}}_{3}$${)}_{7}$ in a broad temperature range above the glass transition temperature. The basic differen…
Crystals of gamma-chymotrypsin grown in aqueous solution were soaked in n-hexane, and the structures of both the soaked and the native crystals were determined to 2.2-A resolution. Seven hexane molecules and 130 water molecules were found in the hexane-soaked crystals. Two of the seven hexane molecules are found near…
We have synthesized single-layer carbon nanotubes by co-vaporizing cobalt with carbon in an arc fullerene \ngenerator and have identified conditions that lead to high yields. The diameter distribution of the tubes and \ntheir morphologies are studied using transmission electron microscopy. For nanotubes produc…
Abstract The synthesis of poly(2,5‐dialkoxy‐ p ‐phenylene)s (PPP) by palladium‐catalyzed polycondensation of 2,5‐dialkoxy‐4‐bromophenylboronic acids is described. Number‐average degrees of polymerization of ca. 30 have been reached at best. The characterization of the polymers by NMR, IR, UV‐VIS and fluorescence spect…
Novel monomeric, oligomeric, and polymeric charge‐transfer complexes with interesting electrical conductivity properties and even exhibiting superconductivity are expected to be obtainable by the systematic chemical modification of extended tetrathiafulvalenes (see Figure for one example). The synthesis and cyclic vol…
Abstract Dicopper(II) hydroxide tris(pyrazolide)s Cu2(OH)(4-Xpz)3 (pz = pyrazolide ion; X = H, CH3, Cl, Br) and Cu2(OH)(4-Xpz)3(4-XpzH)2 (X = Cl, Br) were prepared and characterized by means of magnetic susceptibility and IR spectroscopy. Their magnetic-moment values increased in the substituent sequence X = CH3 &…
Abstract Compounds based on poly(vinyl chloride) (PVC), and containing CaCO 3 filler and trifunctional acrylic crosslinking agent have been crosslinked by exposure to γ‐rays at dosages to 70 kGy. The crosslinking agent was found to be essential for crosslinking to proceed, only minor sensitivity to the irradiation hav…
Five copper‐nickel alloys with nickel contents ranging from 0 weight percent (w/o) to 100 w/o were electrochemically investigated in sulfide polluted seawater (0 to 100 ppm S = ). In addition a chromium modified copper‐nickel alloy (CDA 722) was also investigated. The purpose of this research is to investigate the eff…
Abstract Kaolinite was hydrothermally synthesized from two kinds of silica-alumina gels to examine the effect of the structure of the starting material. Two kinds of gels were prepared by precipitation at different pH conditions (pH = 9.6 and 4.2) from solutions containing water glass and aluminum sulfate. Na ions in…