Materials Literature
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The synthesis and characterization of polysaccharides esterified with gadolinium diethylenetriaminepentaacetic acid (GdDTPA) are described. The results of several synthetic methods are presented for esterification of dextrans and inulin with DTPA. One method results in highly conjugated products labeled with an averag…
Microdesigned interfacial pore structures were used to study pore drag and pore‐boundary separation in Al 2 O 3 . This approach allows the creation of pore arrays containing pores of controlled size and spacing at well‐defined singlecrystal seed/polycrystalline matrix interfaces, and enables experimental determination…
Texture development during the thermomechanical processing of high strength aluminium alloys is reviewed. The alloys dealt with include both conventional heat treatable alloys, and unconventional materials such as rapidly quenched alloys and metal-matrix composites. The processing routes considered include hot and col…
The processes and mechanisms controlling grain growth in crystalline solids are reviewed. The driving forces governing the overall process are considered, and a distinction is made between normal and anomalous grain growth. The influence of solutes and dispersions (soluble and insoluble, coherent and incoherent) is di…
Abstract Monazite structure‐type solid solutions of cerium and terbium orthophosphates Ce 1− x Tb x PO 4 , with 0 < x < 1, were prepared by coprecipitation followed by calcination at 800°C for 2 h. They were used as catalysts for the oxidative dehydrogenation of ethylbenzene. The compounds Ce 0.9 Tb 0.1 PO 4 and…
In Clostridium acetobutylicum ATCC 824, acetoacetate decarboxylase (EC 4.1.1.4) is essential for solvent production, catalyzing the decarboxylation of acetoacetate to acetone. We report here the purification of the enzyme from C. acetobutylicum ATCC 824 and the cloning and expression of the gene encoding the acetoacet…
First-neighbour geometrical models are presented and shown to provide a good approximation for the structural description of binary disordered systems with metallic, covalent or ionic bonding. Sphere mixture models taking into account atomic size and chemical order effects are first studied and analytical expressions…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBuilding and refining a knowledge base for synthetic organic chemistry via the methodology of inductive and deductive machine learningHerbert Gelernter, J. Royce Rose, and Chyouhwa ChenCite this: J. Chem. Inf. Comput. Sci. 1990, 30, 4, 492–504Publication Date (Print):Novembe…
Abstract Heat capacities have been measured for liquid and semicrystalline nylon 6, 11, 12, 6.6, 6.9, 6.10 and 6.12 from above their respective glass transition temperatures (ca. 320 K) to 600 K. Combining those data with all prior literature, a new set of ATHAS recommended values is derived, including a general equat…
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…