Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-electron activation and coupling of ethene by rhodium(II) porphyrins: observation of an .eta.2-ethene-metalloradical complexAndrew G. Bunn and Bradford B. WaylandCite this: J. Am. Chem. Soc. 1992, 114, 17, 6917–6919Publication Date (Print):August 1, 1992Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic and fluorescent probe studies in glassy polymer matrices. 5. Effects of physical aging on bisphenol A polycarbonate and poly(vinyl acetate) as sensed by a size distribution of photochromic probesJ. Scot Royal and John M. TorkelsonCite this: Macromolecules 1992,…
The electrical conductivity and Seebeck coefficient have been measured for pure and Li- or Al-doped CuO. The sign of the Seebeck coefficient of all samples shows p-type semiconducting properties in all temperature and oxygen partial pressure ranges employed in this measurement. The temperature dependence of electrical…
Abstract Polymer blends were prepared in the whole composition range using polymers of different polarity. Mechanical properties were characterized by tensile measurements. Surface and interfacial properties were measured and calculated and parameters characterizing the miscibility were determined. A correlation was f…
Two Curie temperature Tc peaks in differential scanning calorimetry (DSC) are observed in a well-crystallized, nonpoled film of a ferroelectric copolymer of vinylidene fluoride and trifluoroethylene [P(VDF-TrFE)] when it is reannealed at temperatures near Tc. The DSC peak at higher Tc shifts to higher temperature with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew type of pattern formation in polymer mixtures caused by competition between phase separation and chemical reactionHajime Tanaka, Takashi Suzuki, Takafumi Hayashi, and Toshio NishiCite this: Macromolecules 1992, 25, 17, 4453–4456Publication Date (Print):August 1, 1992Publ…
Abstract Spectroscopic and potentiometric studies of Ag(I) binding by tris‐bipyridine strands indicate that the formation of trinuclear silver trihelicates is a process displaying positive cooperativity.
We investigated the characteristics of calcium phosphate cements (CPC) prepared by an exothermic acid–base reaction between NH 4 H 2 PO 4 ‐based fertilizer (Poly‐N) and calcium aluminate compounds (CAC), such as 3CaO · Al 2 O 3 (C 3 A), CaO · Al 2 O 3 (CA), and CaO · 2Al 2 O 3 (CA 2 ), in a series of integrated studie…
Newly developed methods for performing ab initio total-energy calculations on parallel computers have been used to study the formation and migration energies of lithium Frenkel defects in Li 2 O. The calculations, based on density functional theory and pseudopotential-plane-wave techniques and performed on large perio…
The oprO gene of Pseudomonas aeruginosa codes for a polyphosphate-specific porin and terminates 458 bp upstream of the start codon for the phosphate-specific porin OprP. OprO was found to be expressed only under phosphate-starvation conditions in both wild-type and oprP::Tn501 mutant P. aeruginosa strains. However, un…
In this paper we report the dc Kerr constant and the pretransitional temperature of a polar nematic liquid crystal 4-(trans-4'-4'-n-pentylcyclohexy)-benzonitrile (PCH-5). The observed second-order pretransitional temperature ${\mathit{T}}^{\mathrm{*}}$ from our measurements is found to be 1.2 \ifmmode^\circ\else\textd…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of lanthanum cobalt oxide (LaCoO3) highly dispersed on zirconium dioxideNoritaka Mizuno, Hiroaki Fujii, Hiroshi Igarashi, and Makoto MisonoCite this: J. Am. Chem. Soc. 1992, 114, 18, 7151–7158Publication Date (Print):August 1, 1992Publication History Published onli…
Silylene (SiH 2 ) radicals have been detected by intracavity laser absorption spectroscopy in a parallel plate RF-discharge system used in the chemical vapor deposition of hydrogenated amorphous silicon. By the use of two different calibration methods, an absolute density ranging from 2×10 8 to 6×10 9 cm -3 has been o…
The overlapping fdhA and fdhB genes of Methanobacterium formicicum, which encode the alpha and beta subunits, respectively, of formate dehydrogenase, were cotranscribed as part of an approximately 4.5-kb transcript. An additional gene (fdhC) upstream of fdhA was cotranscribed with fdhA and fdhB. The deduced amino acid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDevelopment of phase morphologies of poly(methyl methacrylate)-polystyrene-toluene mixtures in electric fieldsGanesh Venugopal and Sonja KrauseCite this: Macromolecules 1992, 25, 18, 4626–4634Publication Date (Print):August 1, 1992Publication History Published online1 May 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state NMR studies of the molecular motion in the kaolinite: DMSO intercalateMelinda J. Duer, Joao Rocha, and Jacek KlinowskiCite this: J. Am. Chem. Soc. 1992, 114, 17, 6867–6874Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Publish…
A direct electron to carbon DNP solid effect polarization transfer is observed for the aromatic and carbonyl carbons of polycarbonate homogeneously doped with BDPA. The direct electron to carbon polarization transfer operates over a range of 30 to 60 A. Carbons that are closest to the frees radicals are polarized firs…
A solution of the problem of topology of a hydrogen bond net in a triple helix of collagen is suggested on the basis of an analysis of thermodynamic data on denaturation of phylogenetically different collagen [T. V. Burjanadze (1982), Vol. 21, pp. 1489-1501; T. V. Burjanadze, E. I. Tiktopulo, and P. L. Privalov (1987)…
Summary This paper describes a theoretical approach to determine the inhibitor dynamic adsorption isotherm from coreflood experiments. The main feature of the isotherm that contributes principally to the long squeeze life is highlighted. The problems of modeling near-well squeeze treatments and an improved simulator a…
Abstract The microphase separation transition (MST) has been studied for short chain diblock copolymers poly(styrene‐ b ‐isoprene) and poly(styrene‐ b ‐mma). A detailed analysis of small‐angle x‐ray scattering (SAXS) profiles in the homogeneous phase allows determination of the interaction parameter and the spinodal t…