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。
Abstract Celadonite, glauconite and Fe-illite samples were studied by XRD, EXAFS, IR and Mössbauer spectroscopy. The samples were monomineralic and corresponded to 1 M polytype. In the OH-stretching region of the IR spectra the content of each definite pair of cations bonded to OH groups was determined. The number of…
The restrictions imposed by both chemistry and three-dimensional space on the structures of inorganic crystals can be analysed using the bond-valence model and space-group theory. The bond-valence model is used to construct a bond graph (connectivity table) from which the multiplicities and possible site symmetries of…
The homologous series of 8-fold alkyl-substituted octasilsesquioxane has been prepared by hydrosilation of alkenes with octakis(hydridosilsesquioxane) (HSiO 3/2 ) 8 . Ethene, propene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, and 1-decene were employed either in bulk or in toluene solution. The hom…
The evolution of hydrogen bonding with temperature in three copoly(ether−urea)s with no phase separation has been studied by Fourier transform infrared spectroscopy (FT-IR) in the region of the carbonyl absorption of the urea groups. Assignment of the bands was made by supposing the existence of chains of urea groups…
Blends of solutions of poly[2,2‘-( m -phenylene)-5,5‘-bibenzimidazole] (PBI) with poly(amic acids) (PAA's) synthesized from BTDA (3,3‘,4,4‘-tetracarboxybenzophenone dianhydride) and DSDA (3,3‘,4,4‘-tetracarboxydiphenyl sulfone dianhydride) with 3,3‘-DDSO 2 (3,3‘-diaminodiphenyl sulfone), 4,4‘-DDSO 2 (4,4‘-diaminodiphe…
The crystallographic properties and defects of hydrothermally grown barium titanate crystallites are reported. When a precursor with a Ba:Ti molar ratio of 1.0 was used, cubic barium titanate crystallites were formed. However, when the precursor Ba:Ti molar ratio was 3.0, the product was tetragonal. The defect concent…
The effects of local nonequilibrium solute diffusion on a solute concentration field, solute partitioning, interface temperature, and absolute stability limit have been considered. The model incorporates two diffusive speeds, ${\mathrm{V}}_{\mathrm{Db}}$, the bulk-liquid diffusive speed, and ${\mathrm{V}}_{\mathrm{Di}…
In this paper, we demonstrate that reasonably ordered multilayer films of silver clusters can be deposited by the Langmuir−Blodgett (LB) technique. The approach consists of electrostatically immobilizing negatively charged carboxylic acid derivatized silver colloidal particles at the air−water interface using positive…
Abstract The six‐membered lactide was polymerized using the ring‐opening polymerization with lipase as a catalyst at a temperature between 80 and 130°C in bulk to yield the corresponding polylactide with weight‐average molecular weights of up to 126000. The most preferable conditions with respect to the molecular weig…
The electronic state of the deuterated salt of the organic system \ensuremath{\kappa}-(BEDT-TTF${)}_{2}$Cu[N(CN${)}_{2}$]Br, has been investigated by dc/ac susceptibility and $^{1}\mathrm{/}^{13}$C NMR measurements. We found that the system is situated in the critical region of the transition between a superconducting…
Abstract Fundamental particles of illite-smectite from bentonites were separated into classes by high-speed centrifugation after infinite osmotic swelling of mixed-layer crystals, achieved by Na-exchange and dispersion in distilled water. In samples free of detrital contamination, the thinnest fundamental particles yi…
Three-dimensional structures are reported for a mutant (betaK87T) tryptophan synthase alpha2beta2 complex with either the substrate L-serine (betaK87T-Ser) or product L-tryptophan (betaK87T-Trp) at the active site of the beta-subunit, in which both amino acids form external aldimines with the coenzyme, pyridoxal phosp…
Analytic theory and numerical modelling are presented for the prism coupling of light to long range surface modes supported by a thin absorbing film. If both transverse magnetic and transverse electric modes can be excited, then by comparing theory to angle dependent reflectivity data the optical permittivity and thic…
This review covers the recent advances in reciprocal space mapping. The experimental techniques as well as the theoretical and conceptual developments are discussed. The advantages of reciprocal space mapping over the conventional single scan X-ray scattering methods become clear from the examples presented. Extractin…
Other| June 01, 1997 The solubility of H2 O in phonolitic melts Michael R. Carroll; Michael R. Carroll Bristol University, Department of Geology, Bristol, United Kingdom Search for other works by this author on: GSW Google Scholar Jennifer G. Blank Jennifer G. Blank Carnegie Institution of Washington, United States Se…
Magnetic and transport properties are investigated for single crystals of layered perovskite cobalt oxides, ${\mathrm{La}}_{2\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Sr}}_{\mathrm{x}}$${\mathrm{CoO}}_{4}$ (0.4\ensuremath{\leqslant}x\ensuremath{\leqslant}1.0). The effective magnetic moment ${\mathrm{\ensuremath{\mu…
Transparent zinc oxide (ZnO) films have been grown by galvanostatic cathodic deposition onto conductive glasses from a simple aqueous zinc nitrate electrolyte maintained at 335 K. The as‐deposited ZnO films were characterized with Fourier transform infrared absorption spectroscopy, x‐ray diffraction, scanning electron…
A systematic study of the diamond-graphite structural phase transition in ultradisperse-diamond clusters obtained by the detonation technique is reported. Samples of two types, differing in the kinetics of detonation-product cooling, were investigated. The phase transition was achieved under heating in an inert atmosp…
Single-phase samples of La 1 - y MnO 3 - (3 y /2)+ δ with 0 ≤ y ≤ 0.09 and LaMn 1 - z O 3 - (3 z /2)+ δ with 0 ≤ z ≤ 0.09 have been prepared via the citrate method with subsequent heating at different temperatures and partial pressures of oxygen. Oxygen parameters 0 ≤ δ ≤ 0.18 were obtained. At room temperature, all c…
Structural and energetic factors play an important role in the development of a new generation of automobile exhaust catalysts containing CeO{sub 2} doped with ZrO{sub 2} and/or other rare earth oxides such as PrO{sub x}, Y{sub 2}O{sub 3}, and La{sub 2}O{sub 3}. These new catalysts possess high oxygen storage capacity…