Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStatistical properties of random cross-linked rubbersGary S. Grest and Kurt KremerCite this: Macromolecules 1990, 23, 23, 4994–5000Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November 1990https://pubs.acs.org/doi…
The unoccupied molecular orbitals of metal-free phthalocyanine (H2PC), nickel-phthalocyanine (NiPC), and copper-phthalocyanine (CuPC) adsorbed on single crystal surfaces have been studied by inverse photoemission spectroscopy (IPES) and near-edge x-ray absorption spectroscopy (NEXAFS). The features observed in the exp…
The ordering of the ${\mathrm{Fe}}^{2+}$ and ${\mathrm{Fe}}^{3+}$ ions on the octahedral sites of magnetite (${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$) at temperatures below the Verwey metal-insulator transition has been studied by quantitative high-energy transmission electron diffraction. We find that there are ten inde…
Experimental evidence determined by scanning transmission electron microscopy, scanning Auger electron spectroscopy, and lattice parameter measurements is reported for interfacial segregation in pure and doped perovskite materials, e.g., BaTiO 3 and SrTiO 3 . The segregation behavior for isovalent dopants (e.g., Sr 2+…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCluster of clusters: a modular approach to large metal clusters. Structural characterization of a 38-atom cluster [(p-Tol3P)12Au18Ag20Cl14] based on vertex-sharing triicosahedraBoon K. Teo, Hong Zhang, and Xiaobo ShiCite this: J. Am. Chem. Soc. 1990, 112, 23, 8552–8562Public…
The interaction of Hoechst 33258, a fluorescent DNA stain, has been studied by using the synthetic, self-complementary oligonucleotide duplex d(CGCGAATTCGCG)2. Spectrofluorometric Scatchard analysis indicated that there was only a single class of binding site and that the 1:1 complex had a dissociation constant of (3.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural investigations of nickel complexes with nitrogen and sulfur donor ligandsGerard J. Colpas, Manoj Kumar, Roberta O. Day, and Michael J. MaroneyCite this: Inorg. Chem. 1990, 29, 23, 4779–4788Publication Date (Print):November 1, 1990Publication History Published onli…
Abstract Copper(II) ion-exchanged ZSM-5 zeolites with 100% or more exchange levels were readily prepared by addition of basic compounds such as ammonia and Mg(OH)2 to the mother solution. The catalytic activities of the resulting zeolites for decomposition of nitrogen monoxide are dependent on pH of the solution and t…
Probability relationships between structure factors from related structures have allowed previously only for either differences in atomic scattering factors (isomorphous replacement case) or differences in atomic positions (coordinate error case). In the coordinate error case, only errors drawn from a single probabili…
Abstract Crack healing in poly(methyl methacrylate) (PMMA) by methanol treatment at 40°C–60°C has been investigated. It is found that the methanol treatment reduces the glass transition temperature in PMMA. Crack healing only occurs at an operating temperature higher than the effective glass transition temperature. Th…
Scanning transmission electron microscopy (STEM) of positive‐temperature‐coefficient (PTC) BaTiO 3 thermistors shows that the grain‐boundary oxygen content in as‐received (oxidatively cooled) materials is slightly enriched compared to quenched samples, and the acceptor‐rich space‐charge present at high temperatures is…
High stiffness and strength combiend with low weight are the advantages offered by carbon fibers in the manufacture of reinforced composites. Effective use of these materials depends on an understanding of structure–property relationships One method of help in this work in small angle X‐ray scattering (SAXS), where th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLadder polymers: recent developments in syntheses, characterization, and potential applications as electronic and optical materialsLuping Yu, Mai Chen, and Larry R. DaltonCite this: Chem. Mater. 1990, 2, 6, 649–659Publication Date (Print):November 1, 1990Publication History…
For pt.II see ibid., vol.6, no.5, p.35 et seq. (1990). The question of how to relate the magnitude of the measured, effective, partial discharge (PD) to the size, shape, and position of the cavity within a solid dielectric system is addressed. The causes of cavities are examined, and a brief review of gas breakdown is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of thiazole rings to enhance molecular second-order nonlinear optical susceptibilitiesC. W. Dirk, H. E. Katz, M. L. Schilling, and L. A. KingCite this: Chem. Mater. 1990, 2, 6, 700–705Publication Date (Print):November 1, 1990Publication History Published online1 May 2002…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer-supported poly(amino acids) as new asymmetric epoxidation catalyst of .alpha.,.beta.-unsaturated ketonesShinichi Itsuno, Minako Sakakura, and Koichi ItoCite this: J. Org. Chem. 1990, 55, 24, 6047–6049Publication Date (Print):November 1, 1990Publication History Publis…
A model is proposed to relate segregation of dopants with the development of fine ceramic microstructures and electrical properties in polycrystalline donor‐doped BaTiO 3 . As the average dopant concentration is increased, the dopant concentration at the grain boundary increases compared with the bulk. This has two im…
Precipitation causes changes in the modes of plastic deformation and recrystallisation, as well as in the development of rolling and recrystallisation textures. The nature of these changes varies strongly with the size, shape, and density of the particles and, in particular, on whether the particles are cut by disloca…
Whereas xenogeneic collagen has provided a safe and effective biomaterial for numerous medical applications, there are few instances in which data permit the correlation of the immunologic profile of well-defined devices with their clinical sequelae. A major exception is the use of injectable bovine dermal collagen fo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescent and redox-reactive building blocks for the design of photochemical molecular devices: mono-, di-, tri-, and tetranuclear ruthenium(II) polypyridine complexesGianfranco Denti, Sebastiano Campagna, Luigina Sabatino, Scolastica Serroni, Mauro Ciano, and Vincenzo Bal…