Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Unconventional bismuthate glasses containing lithium oxide have been prepared by a conventional melt-quench technique. X-ray diffraction, scanning electron microscopy, and differential thermal analysis show that stable binary glasses of composition $x{\mathrm{Li}}_{2}\mathrm{O}\ensuremath{-}(100\ensuremath{-}x){\mathr…
Recent developments concerning the nonlinear optical (NLO) properties of quasilinear conjugated oligomers, polymers and organic molecules are reviewed. Although our approach is from a theoretical perspective, it is oriented towards the practical design of both second- and third-order NLO materials. Since the field is…
The structure, thermal expansion coefficients and ionic conductivity of Ce 1 - x Sm x O 2 - x /2 and Ce 1 - x Ca x O 2 - x ( x = 0−0.30) solid electrolytes prepared hydrothermally in a relatively wide concentration range for the first time were systematically investigated. The uniformly small particle size (40−68 nm)…
A molecular-dynamics simulation of extended simple point charge water in a time interval of 1 fs to 50 ns has been performed to study the single-particle dynamics of water at supercooled temperatures. In spite of the fact that upon supercooling water progressively evolves into a more open structure locally, the single…
The ordered mesoporous silicate MCM-48 has been produced from MCM-41 by a phase transformation method, which involves heating the silicate samples while they are still incompletely polymerized. Ethanol, produced by hydrolysis of the silicate source TEOS, plays a crucial role in the transformation process. In this repo…
The kinetics of adsorption of poly( o -methoxyaniline) (POMA) via self-assembly has been investigated using UV−vis spectroscopy. Though experimental conditions, including type of substrate, affect the amount of polymer adsorbed, adsorption of the first POMA layer on glass substrates was shown to occur in two stages, r…
Oxidative electrochemical polymerization of ( N, N ‘-ethylenebis(salicylideneaminato)) nickel(II), [Ni(salen)], in acetonitrile/TEAP was reinvestigated. The polymers were characterized by in situ FTIR and UV−visible spectroscopies in order to explore film structure and to clarify the electronic states as a function of…
Using partial amino acid sequence information for 12-oxophytodienoate-10,11-reductase obtained from Corydalis sempervirens we have cloned the homologous enzyme from Arabidopsis thaliana. The open reading frame of the cDNA encodes a polypeptide of 372 amino acids (Mr = 41,165) with significant similarity to the sequenc…
Measurements of thermal conductivity versus temperature and magnetic field are reported for perovskite manganites that exhibit ferromagnetic (FM), charge-ordering (CO), antiferromagnetic, and/or structural phase transitions. The data reveal a dominant lattice contribution to the heat conductivity with $\ensuremath{\ka…
In recent years a central objective of tissue engineering has been understanding the interaction of cells with biomaterial surfaces. In this study we examined the protein adsorption events necessary to control the attachment and the subsequent spatial distribution of bone-derived cells exposed to chemically modified s…
New lactide-based poly(ethylene glycol) (PEG) polymer networks (GL−PEGs) have been prepared by UV photopolymerization using two nontoxic macromers, triacrylated lactic acid oligomer emanating from a glycerol center (GL) and monoacrylated PEG. These materials have been developed for use as polymer scaffolds in tissue e…
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…