Materials Literature
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We study a triangular network containing two kinds of Hooke springs with different natural lengths. If the two spring constants are the same, we can solve the model exactly and show that Vegard's law is obeyed, irrespective of whether the bonds are arranged randomly or in a correlated way. A more complete description…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReevaluation of the surface tension components and parameters of polyacetylene from contact angles of liquidsC. J. Van Oss, R. F. Giese Jr., and R. J. GoodCite this: Langmuir 1990, 6, 11, 1711–1713Publication Date (Print):November 1, 1990Publication History Published online1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA comparison of relaxation time distributions obtained from dynamic light scattering and dynamic mechanical measurements for high-molecular-weight polystyrene in entangled solutionsTaco Nicolai, Wyn Brown, Soeren Hvidt, and Kurt HellerCite this: Macromolecules 1990, 23, 24,…
The evolution of the cold deformation microstructure is described for medium to high stacking fault energy, single phase fcc metals. Macroscopic strain accommodation for polycrystalline metals is considered, and it is suggested that grains subdivide during deformation on a smaller and smaller scale, and that each volu…
The phenomenon of electromechanical failure of zirconia has been examined. It is shown that spatial variation of electronic conductivity in a predominantly oxygen ion conductor can lead to internal precipitation of molecular oxygen and its pressurization. Internal pressures high enough to crack zirconia can develop if…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSequence-regulated oligomers and polymers by living cationic polymerization. 2. Principle of sequence regulation and synthesis of sequence-regulated oligomers of functional vinyl ethers and styrene derivativesMasahiko Minoda, Mitsuo Sawamoto, and Toshinobu HigashimuraCite th…
Microwave-induced changes in the optical emission of the N-V center in diamond have previously been attributed to magnetic resonance of the defect in its $^{3}$A ground state [E. van Oort et al., J. Phys. C 21, 4385 (1988)]. In this paper, the focus is on the origin of the hyperfine splittings that are observed in the…
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+…