Materials Literature
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Other| October 01, 1997 Viscosity, fragility, and configurational entropy of melts along the join SiO2 -NaAlSiO4 Michael J. Toplis; Michael J. Toplis Universitaet Bayreuth, Bayerisches Geoinstitut, Bayreuth, Federal Republic of Germany Search for other works by this author on: GSW Google Scholar Donald B. Dingwell; Do…
Alkaline earth‐doped lanthanum gallate powders were prepared by glycine/nitrate combustion synthesis. Compacts of powders synthesized under fuel‐rich conditions were sintered to densities greater than 97% of theoretical. Appropriate doping with Sr or Ba on the A‐site of the perovskite structure, and Mg on the B‐site,…
A thorough study of Mn $K$-edge x-ray-absorption near-edge spectroscopy (XANES) on several manganites has been performed. The spectra of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ have a similar shape for the whole series. The chemical shift for intermediate compositions lies between the two…
The electrode performance of a single solid oxide fuel cell was evaluated using a 500 μm thick (LSGM) as the electrolyte membrane. Comparison of (LSCo) and (LSM) as cathodes showed LSCo gave an exchange current density two orders of magnitude higher than that of LSM. Comparison of and LSGM/Ni as anodes showed a degrad…
Adhesion, spreading, and focal contact formation of primary bone-derived cells on quartz surfaces grafted with a 15 amino acid peptide that contained a -RGD-(-Arg-Gly-Asp-) sequence unique to bone sialoprotein was investigated. The peptide surfaces were fabricated by using a heterbifunctional crosslinker, sulfosuccini…
Interfaces (grain boundaries and surfaces) are studied in acceptor (Fe) doped bicrystals, single crystals, and ceramics as a function of temperature , oxygen partial pressure , and Fe doping content using electrochemical methods. In particular, impedance spectroscopy and dc polarization techniques have been applied. T…
Structure and dynamics of the partially folded A state of ubiquitin in a 60%/40% methanol/water mixture at pH 2 was studied by two- and three-dimensional nuclear magnetic resonance spectroscopy (NMR) using fully 13C,15N-labeled ubiquitin. Complete backbone 13CO, 13Calpha, 15N, and 1HN assignment was achieved. 13CO and…
A number of phosphatidyl choline derivatives containing trans -azobenzene units in the fatty ester backbone have been synthesized and studied in aqueous dispersions both pure and in the presence of saturated and unsaturated phospholipids. The structures of the assemblies formed have been investigated by microcalorimet…
There have been significant developments in the pillaring of lamellar ionic materials, and the resulting zeolite-like pillared derivatives have built a large family of microporous materials. This review focuses on the host−guest reactions involved in the preparative procedures. Furthermore, approaches to the modificat…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTExact Linear Analogs of Dendritic Polyether Macromolecules: Design, Synthesis, and Unique PropertiesCraig J. Hawker, Eva E. Malmström, Curtis W. Frank, and J. Patrick KampfView Author Information Center for Polymeric Interfaces and Macromolecular Assemblies IBM Almaden…
Swollen and highly ordered MCM-41 type materials with varied pores sizes, but with similar wall thicknesses, have been directly synthesized in the absence of auxilliary organics by controlling the preparation conditions. The most important parameter in the synthesis in order to control the pore opening is the cetyltri…
Ti−MCM41 catalysts prepared by anchoring titanocene onto the inner walls of MCM-41 exhibit high catalytic performance in the epoxidation of cyclohexene and in oxidation of bulky cyclic and aromatic compounds because of the presence, as revealed by means of XANES and EXAFS spectroscopy, of a high concentration of acces…
The structures, phase transformations, and dielectric properties of pyrochlore ceramics containing bismuth were studied. The relation between the orthorhombic and cubic pyrochlores in the Bi 2 O 3 ‐ZnO‐Nb 2 O 5 (BZN) system has been investigated. The effect of bismuth in distorted cubic pyrochlore structures is discus…
A model based on grain-boundary sliding control of the flow process of nano-crystalline materials is proposed. It is demonstrated that the agreement between the theory and the experimental results concerning both nanocrystalline metals and ceramics is quite satisfactory.
The vibrational properties of models of vitreous silica constructed by molecular-dynamics simulation with different interatomic potentials have been investigated. The static and dynamical structure factors of the model systems are in good agreement with experimental data. Partial and total vibrational densities of sta…
The atomic pair-density function of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ $(0<~x<~0.4)$ obtained by pulsed neutron diffraction indicates that their local atomic structure significantly deviates from the average structure, and that the local Jahn-Teller (JT) distortion persists eve…