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。
The electrical switching characteristics of reflection gratings formed using polymer-dispersed liquid crystals are explored. First, an explanation for the lack of switching in previously formed gratings formed using E7 as the liquid crystal is proposed based on experiments on slightly slanted gratings. These confirm t…
The application of resonant (anomalous) scattering techniques to ab initio structure solution from powder data is demonstrated for the compound SrSO 4 . This material is orthorhombic, in space group Pnma ( a = 8.359, b = 5.351, c = 6.869 Å, Z = 4), with 11 variable atomic positional parameters, and gives a fairly comp…
Tensile creep and the creep ruptures of an alumina‐17 vol% silicon carbide nanocomposite at 1200°C were investigated, with a particular interest in the behaviors at low applied stresses. At stresses of <50 MPa, the creep rates were remarkably decayed and the creep lives were substantially prolonged, which suggested…
A dry route to etching metal oxides at low temperatures (<200°C) using gaseous β-diketones is described. The Figure is an SEM micrograph of a ZnO film after etching. This method is a promising alternative to current wet-etching and cleaning methods as easily desorbed, volatile, low-molecular-weight metal–organic produ…
The formation of complexes and the mode of binding to macrocyclic host molecules (α- and β-cyclodextrins, CDs) of the nootropic drug CI-844 (3-phenoxypyridine sulphate, Warner-Lambert/Parke-Davis) were studied using NMR techniques (T-ROESY) complemented by molecular dynamics (MD) protocols which allowed complete inter…
Single crystals of natural diamond which exhibit an approximately cubic morphology are known to have grown either ( a ) by nonfaceted cuboid growth or ( b ) by fibrous growth branching in a multiplicity of 〈111〉 columns, to give a mean surface orientation of {100}. Interpenetrant twins of diamond are uncommon; but whe…
The basic structural differences between three thermotropic liquid crystals TB4A, TB7A and TB10A have been interpreted by analysing their Raman spectra. Three spectral regions, 925-1025, 1275-1475 and 1525-1650 cm-1, have been chosen in this context to incorporate their structural dissimilarity. The induced planarity…
Abstract Okayamalite, Ca 2 B 2 SiO 7 , tetragonal, P 21 m , a = 7.116, c = 4.815 Å, Z = 2, is a new member of melilite group, the boron analogue of gehlenite. Electron microprobe analysis gave CaO 46.28, B 2 O 3 28.50, SiO 2 24.24, Al 2 O 3 0.36, total 99.38 wt.%, corresponding to Ca 2.01 B 2.00 Si 0.98 Al 0.02 O 7 ,…
Bei der Oxidation der Lanthanide Gadolinium, Terbium, Dysprosium und Holmium mit Selen im molaren Verhältnis 2 : 3 in evakuierten Quarzglasampullen (700 °C, 7 d) bilden sich unter Zugabe von CsCl ternäre Caesium–Lanthanid-Selenide der Zusammensetzung Cs3M7Se12 (M = Gd–Ho). Ein großer Überschuß an CsCl fördert als Fluß…
A series of new bis-benzocyclobutene-endcapped arylene ether monomers was prepared and characterized. Whereas 2,6-bis(4-benzocyclobutenyloxy)benzonitrile (BCB-EBN) could be prepared in good yield using the standard procedure (K2CO3/NMP/toluene/Dean–Stark trap/120°C), other bis(benzocyclobutene) (BCB)-terminated monome…
The synthesis of Li 6 CoO 4, Na 4 CoO 3, and Na 10 Co 4 O 9 and the refinements of the crystal structures of the two sodium compounds are reported. The physical properties of these materials have been studied by measuring the absorption spectra and the susceptibility. An interpretation of these data is presented for t…
Structural parameters for the ferrimagnetic and paramagnetic phases of magnetite have been refined from neutron multiple diffraction data. Experimental neutron multiple diffraction patterns were obtained by measuring the 111 primary reflection of a natural single crystal of this compound. Measurements were made at roo…
Various water-soluble polymers, with special emphasis on polyacids, were employed for the stabilization of colloidal platinum nanoparticles which had been prepared by the in-situ reduction of dihydrogen hexachloroplatinate H2PtCl6. The particle sizes, size distributions, and morphologies of the platinum nanoparticles…
The structure of porous silicon carbide has been studied using transmission electron microscopy both in planar geometry and in a cross-section of a porous film. Peculiar structures in the form of shared rosettes with petals of about 3-8 m in size and a density of were found in the subsurface layer. These formations ar…
Abstract Hydroxyaluminosilicate (HAS) and hydroxyaluminum (HyA) ionic solutions having final Al concentrations ranging from 3.74 to 4.00 m M ; NaOH/Al molar ratios of 1.0, 2.0 and 2.5; and Si/Al molar ratios of 0.00, 0.27–0.30, 0.51–0.56 and 0.95–1.01 were prepared through the interaction of AlCl 3 , or-thosilicic aci…
This paper presents a summary of an on-going multi-client programme undertaken by D&K Consulting SA covering "Breathable and Water proof Fabrics." The reports for Western Europe and the U.S. markets have already been published and the analysis of selected Asian countries is planned for this year. The whole program…
In this paper, the effect of silicone softener application on low-stress mechanical and surface properties of textile materials is investigated using the Kawabata evaluation system for fabrics. Regression equations are derived to describe the influence of the treatment conditions—temperature, curing time, and softener…
Growth histories of contact twins of natural diamond have been elucidated by nondestructive techniques of X-ray topography, using both conventional and synchrotron sources. Reflection conditions for the simultaneous imaging of both members of a diamond, twinned on (111), are given. The common `triangular' contact twin…
A procedure to determine dialysate pressure isobars by comparing the results of magnetic resonance imaging (MRI) and numerical simulation of the dialysate flow was established. The assumption used in the filtration analyses, that the dialysate pressure varies only in the central-axial direction, is supported by the fi…
Frozen crystals of proteins, nucleic acids or other biological macromolecules often have mosaic spreads comparable to the maximum useful oscillation angles. It is, therefore, necessary to develop scaling methods that are independent of the exclusive use of full reflections. The Hamilton, Rollett and Sparks [ Acta Crys…