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。
When a fluid composed of sufficiently asymmetric hard particles is compressed, purely entropic effects give rise to phases possessing long-range orientational and, in some cases, translational order. The various ordered phases observed in conventional lyotropic liquid-crystal systems are commonly described in terms of…
Abstract The crystal structures of polymorph II of diisothiocyanatobis(2,2′-bipyridine)iron(II), [Fe(bpy)2(NCS)2], in the high- (298 K) and low-spin states (175, 110 K) were determined by an X-ray diffraction method. The crystal is orthorhombic, space group Pcnb and Z=4 over the entire temperature range. At 298 K, a=1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT[Cu3(.mu.3-.eta.1-C.tplbond.CPh)2(.mu.-Ph2PCH2PPh2)3][BF4], a triangulo copper(I) complex with an unprecedented bicapping system of two asymmetric .mu.3-.eta.1-acetylide ligandsJosefina Diez, M. Pilar Gamasa, Jose Gimeno, Angel Aguirre, and Santiago Garcia-GrandaCite this: O…
Effects of some additives (V, Cr, Mn, Co, Ni, Pd, Pt) on thermoelectric properties of FeSi 2 thin films were studied. V, Cr or Mn-doped FeSi 2 films were of p-type semiconductor and Co, Ni, Pd and Pt-doped FeSi 2 films of n-type semiconductor. It was indicated that V or Cr are more suitable additives in thermoelectric…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhenyl substituents and excited-state lifetimes in ruthenium(II) terpyridylsClark R. Hecker, Ann. K. I. Gushurst, and David R. McMillinCite this: Inorg. Chem. 1991, 30, 3, 538–541Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiadamantylsilylene and its stereochemistry of additionDong Ho Pae, Manchao Xiao, Michael Y. Chiang, and Peter P. GasparCite this: J. Am. Chem. Soc. 1991, 113, 4, 1281–1288Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published inissu…
Tetragonal BaTiO 3 thin films were prepared directly on Ti metal substrates in Ba(OH) 2 solutions by a hydrothermal method at temperatures 400° to 800°C for 5 to 240 min. The film thickness estimated from weight gain of Ti plate was in the range from 0.5 to 2.5 μm, and it increased with increasing treatment temperatur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight-induced dioxygen reduction at thin film electrodes of various porphyrinsD. Schlettwein, M. Kaneko, A. Yamada, D. Woehrle, and N. I. JaegerCite this: J. Phys. Chem. 1991, 95, 4, 1748–1755Publication Date (Print):February 1, 1991Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControl of back electron transfer from charge-transfer ion pairs by zeolite supercagesS. Sankararaman, K. B. Yoon, T. Yabe, and Jay K. KochiCite this: J. Am. Chem. Soc. 1991, 113, 4, 1419–1421Publication Date (Print):February 1, 1991Publication History Published online1 May…
Class A beta-lactamases are known to hydrolyze substrates through a Ser70-linked acyl-enzyme intermediate, although the detailed mechanism remains unknown. On the basis of the tertiary structure of the active site, the role of Glu166 of class A enzymes was investigated by replacing the residue in RTEM-1 beta-lactamase…
Two kinds of SiC whiskers were annealed at temperatures similar to those for the processing of ceramic matrix composites. The morphology and structure of the as‐received and postannealed whiskers were investigated by SEM, TEM, and XRD, and the influence of processing temperature on the mechanical properties of ceramic…
Acid, infertile soils typically benefit from the addition of K, Ca, Mg, or S fertilizers. Polyhalite, K2MgCa2 (SO4)4·2H2O, may provide a slow-release fertilizer source of these nutrients. Sorghum-sudangrass (Sorghum bicolor, L. Moench 'NB280S - S. Sudanese (Piper) Stapf.) was grown in Red Feather loamy sand soil (Lith…
The technique of high-angle annular dark-field (HAADF) imaging, which is highly sensitive to atomic-number contrast, can be performed on TEM/STEM systems using the standard annular dark-field detector. For optimum HAADF imaging, the TEM/STEM must have a high maximum diffraction angle, small minimum camera length, and…
<div class="htmlview paragraph">The cylinder of the aluminum engine block without iron sleeve was coated directly with thin thermal barrier coatings of zirconia and chrome oxide. The cylinder head and valve face and the piston crown were also coated. These three engine components were tested individually and tog…
Selen-tellurium is a mixture of the minerals selenium and tellurium. The atoms in stibarsen are ordered (completely or partially) so that the correct chemical formula is AsSb. Matildite AgBiS2, bohdanowiczite AgBiSe2, and volynskite AgBiTe2, show atomic ordering in space group P3ml with unit-cell dimensions similar to…
The effect of forced and natural convection on the shape evolution of deep cavities during wet chemical etching was investigated. Etching was assumed to be limited by removal of the dissolution products away from the vicinity of the active surface. Finite element methods were employed to solve for the fluid velocity a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIdentification of a novel tetragonally compressed six-coordinate copper(II) complex: preparation and characterization of a 3-chloroanilinium copper chloride complex, (3-chloroanilinium)8[CuCl6]Cl4Denise A. Tucker, Peter S. White, Kathleen L. Trojan, Martin L. Kirk, and Willi…
I n situ nitrogen-ion implantation of polycrystalline niobium and tantalum was performed and the surface was characterized by x-ray photoelectron spectroscopy (XPS). The XPS chemical shifts indicated the formation of metal nitride. The chemical shift values are calculated theoretically and compared with the experiment…
The optical transfer matrix technique for the analysis of optical harmonic generation and mixing in laminar structures is extended to include the case of anisotropic media. This approach is applicable in the limit of low conversion efficiencies, where attenuation and phase shifts of the pump beams due to nonlinear int…
The influence of oxygen vacancies on the electronic structure of yttrium oxide was investigated both experimentally and theoretically. By means of X‐ray absorption spectroscopy, at the yttrium K and L 11 edges and at the oxygen K edge, information on the local densities of states of various orbital symmetries, around…