Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe crystal/liquid interface: structure and properties from computer simulationBrian B. Laird and A. D. J. HaymetCite this: Chem. Rev. 1992, 92, 8, 1819–1837Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFirst ferromagnetic interaction in a heteropoly complex: [CoII4O14(H2O)2(PW9O27)2]10-. Experiment and theory for intramolecular anisotropic exchange involving the four Co(II) atomsNieves Casan-Pastor, Julia Bas-Serra, Eugenio Coronado, Genevieve Pourroy, and Louis C. W. Bake…
Pseudomonas oleovorans is an adaptable, aerobic bacterium that can produce a wide range of storage polyesters (poly-β-hydroxyalkanoates, PHAs). With few exceptions, the PHAs obtained when this bacterium is grown with single organic substrates capable of polymer production are generally copolymers. With two different p…
Polyacrylic acid (PAA) has been chosen to stabilize BaTiO 3 powder in aqueous solution. Zeta potential studies show that the Ba‐rich particle surface is positively charged in the pH range from 2 to 11 without PAA. Adsorption of PAA decreases the zeta potential in acidic solution and changes the surface to a negative c…
Molecular dynamics (MD) studies of collision cascades have firmly established that, in addition to clusters of vacancies, clusters of self-interstitial atoms (SIAs) are formed within the cascade volume during the thermal spike phase of a cascade. These clusters are formed in a segregated fashion such that the vacancy-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of a superoxo complex of the dicobalt cofacial diporphyrin [(.mu.-O2)Co2(DPB)(1,5-diphenylimidazole)2][PF6], the structure of the parent dicobalt diporphyrin Co2(DPB), and a new synthesis of the free-base cofacial diporphyrin H4(DPB)James P. Co…
Recently, there has been amazing progress in the study of highly conductive polyacetylene. The advent of a metallic-conductive polyacetylene has overthrown the general view of the polymeric material. However, the conduction mechanism of the conductive polymer is as yet far from well understood. This review article cov…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly efficient oxidation of alkanes and alkyl alcohols with heteroaromatic N-oxides catalyzed by ruthenium porphyrinsHiro Ohtake, Tsunehiko Higuchi, and Masaaki HirobeCite this: J. Am. Chem. Soc. 1992, 114, 26, 10660–10662Publication Date (Print):December 1, 1992Publicatio…
Molecular-dynamics simulation results are reported for systems of strongly interacting dipolar soft spheres. Calculations have been carried out along two isotherms and the structure of the liquid-crystal and solid phases obtained is described in detail. It is found that in addition to the ferroelectric nematic phase w…
Abstract HNBR rubbers, which are made by selective hydrogenation of the olefinic bonds of NBR rubbers, have been developed, because they show improved resistance towards heat and chemicals. In this study, two other properties are discussed that arise from the fact that HNBR rubbers are fairly alternating copolymers of…
Abstract Structural differences which occur on heating La-montmorillonite have been studied and compared with those for montmorillonite saturated with Na(I) and Li(I). Rehydration experiments show that La-montmorillonite swells after preheating up to 500°C. However, FT-IR spectra suggest partial migration of the La(II…
Both core level and valence band XPS spectra were obtained from an ultrahigh purity (UHP) graphite electrode surface. This UHP graphite had a very low oxygen content and an extremely low nitrogen content on its surface. It had a very graphitic structure in both the surface and the bulk as evidenced by XPS and XRD stud…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray structure analysis of a thermoplastic polyimideKenji Okuyama, Hisashi Sakaitani, and Hiroyuki ArikawaCite this: Macromolecules 1992, 25, 26, 7261–7267Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 199…
Abstract The surface composition of some halloysites with different particle morphology has been investigated by X-ray photoelectron spectroscopy (XPS) before and after removal of external Fe. The Fe(III) 2 p 3/2 binding energy of external Fe is appreciably smaller than that of structural Fe. Particle morphology is in…
The photoacoustic technique is used to investigate the thermal diffusivity of ${\mathrm{Ge}}_{\mathit{x}}$${\mathrm{Te}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$ glasses as a function of composition. The observed dependence on the composition is explained on the basis of the chemically ordered network model. This interpr…
Gallium, when bound to transferrin, has been previously shown to cause tumor cell cytotoxicity by preventing cellular uptake of transferrin bound iron in vitro. Patients treated with constant infusion gallium nitrate for carcinoma show a rise in serum iron within 6 hr of the start of treatment. Serum iron returns to b…
Adhesion of fluoropolymers to copper and to other polymers is examined using a range of fluoropolymer types (PTFE, PFA, extruded, skived and cast films), surface modification techniques such as sodium naphthalenide (Na/naphth), acid stripping and lamination to produce surfaces of controlled roughness, and three tests…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltralow temperature dielectric relaxations in polyolefinsHoward W. Starkweather Jr., Peter Avakian, Robert R. Matheson Jr., John J. Fontanella, and Mary C. WintersgillCite this: Macromolecules 1992, 25, 25, 6871–6875Publication Date (Print):December 1, 1992Publication Histo…
The use of 13C NMR spectroscopy to study the biosynthesis, degradation and physical properties of polyhydroxyallkanoates (PHAs) is described. Solution-state NMR of whole cells allows direct observation of biosynthetic pathways within the cell and demonstrates that the bulk of the polymer is in a remarkably fluid, amor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution structure and conformational equilibria of a symmetrical calix[6]arene. Complete sequential and cyclostereospecific assignment of the low-temperature NMR spectra of a cycloasymmetric moleculeM. Antonia Molins, Pedro M. Nieto, Concha Sanchez, Pilar Prados, Javier De…