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。
Povondraite, previously the tourmaline ferridravite, is redelined. It is rhombohedral, R3m. with a = 16.186(2) and c = 7.444(1) A. The new chemical formula, derived by crystal structure analysis, is (Nao.8oKo26)~Lo6 (Fe~18Fe517M&53)~3.0S (Fe~19MgL36Alo32)~'97B3Si'9602788 (OH)312 and the ideal end-member formula is NaF…
Abstract Smectite was reacted at several temperatures between 200°C and 500°C to produce interstratified illite/smectite (I/S) with different proportions of expandable layers. Dispersed and sedimented products were examined using a transmission electron microscope. Particle size and aspect ratio showed no systematic c…
Diffraction patterns of synthetic Co-akermanite, Ca 2 CoSi 2 O 7 , reveal distinct satellite reflections at room temperature. An incommensurate modulation in this material has been determined by five-dimensional refinement pf the structure. The basic structure is tetragonal P42 1 m, unit-cell dimensions a=7.8417 (6),…
Bridging μ 3 ‐oxo and μ 2 ‐hydroxo ligands characterize the structure of the cluster anion 1 , which can be prepared as a highly soluble K or Na salt in water. The structure of 1 can be viewed as two parallel, μ 3 ‐oxo‐bridged Fe 3 triangles joined by μ‐hydroxo bridges or as two Fe 4 butterfly structures with shared w…
Irradiation creep and growth in zirconium alloys result in anisotropic dimensional changes relative to the crystallographic axis in each individual grain. Several methods have been attempted to model such dimensional changes, taking into account the development of intergranular stresses. In this paper, we compare the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGraft copolymer compatibilizers for blends of isotactic polypropylene and ethene-propene copolymers. 2. Functional polymers approachSudhin Datta and David J. LohseCite this: Macromolecules 1993, 26, 8, 2064–2076Publication Date (Print):April 1, 1993Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImogolite: a possible new type of shape-selective catalystSeiichiro Imamura, Yuki Hayashi, Kanji Kajiwara, Hiroshi Hoshino, and Chihiro KaitoCite this: Ind. Eng. Chem. Res. 1993, 32, 4, 600–603Publication Date (Print):April 1, 1993Publication History Published online1 May 20…
In this study, influence of several physico-chemical properties of bioadhesive polyacrylic acid poylmers (Carbopol 910, Polycarbophil, Carbopol 940 and Carbopol 934 PH) are investigated. The effect of pH on the swelling of polyacrylic acid polymers was studied at constant temperature, ionic strength and osmolality. Th…
Salt-induced aggregation of polystyrene latex confined to two dimensions on an air-water interface has been studied. Fractal dimensions of the aggregates are determined (i) from relation between the radius of gyration and cluster masses and (ii) by the box method. They both increase with aggregation time. While the fr…
Electrochemical impedance spectroscopy (EIS) has been used to study the solute uptake for epoxy/phenolic (E/p) and epoxy/amine (E/a) thick‐coated mild steel samples immersed for 160 days in 3.5 weight percent solution exposed to air. Samples with thicknesses of approximately 200 μm with an exposed surface area of 22.6…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcluded-volume effects on the intrinsic viscosity of oligomers and polymers of styrene and isobutyleneFumiaki Abe, Yoshiyuki Einaga, and Hiromi YamakawaCite this: Macromolecules 1993, 26, 8, 1891–1897Publication Date (Print):April 1, 1993Publication History Published online…
The fracture toughness of a hot‐pressed alumina and that of a hot‐pressed alumina/SiC‐whisker composite containing 33 vol% SiC whiskers were measured by four‐point bending on single‐edge precracked bend bars having sharp precracks created by “bridge indentation.” Two batches of the composite were examined, one exhibit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituent effects on the electrical conductivity and electrochemical properties of conjugated furanylphenylene polymersJohn R. Reynolds, Andrew D. Child, Jose P. Ruiz, Sung Y. Hong, and Dennis S. MarynickCite this: Macromolecules 1993, 26, 8, 2095–2103Publication Date (Pri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNature of plasma-induced surface radicals of powdered polyethylene studied by electron spin resonanceMasayuki Kuzuya, Junji Niwa, and Hideki ItoCite this: Macromolecules 1993, 26, 8, 1990–1995Publication Date (Print):April 1, 1993Publication History Published online1 May 200…
This paper presents a synthesis of data from X-ray diffraction analyses of clay minerals and X-ray fluorescence analyses of bulk mudstones from Ocean Drilling Program Site 808. The samples come from three closely spaced holes drilled through the toe of the Nankai accretionary prism offshore Shikoku, Japan. Detrital as…
The internal structure of water trees is examined in detail, particularly the nonuniformity of their internal structure. The quantitative space distribution of bouquets and microcavities is given. Based on the fact that the water tree is composed of a number of microcavities filled with liquid, the authors analyze the…
Structural investigations of copper and nickel complexes of dodecasubstituted porphyrins bearing aryl groups at the meso positions and propano rings at the pyrrole β positions reveal considerable differences in their macrocycle conformations. While the nickel complex NiTC5T(3,4,5-OMeP)P was found to exhibit a nonplana…
Sputter‐deposited Al‐W alloys exhibit considerably enhanced resistance to pitting corrosion over a range of pHs extending from pH 0 to 9.6. Surface analysis showed that although very little oxidized W is found in the passive film at near‐neutral pHs, at pH 3 there are comparable amounts of oxidized W and Al. A review…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkaplanes: a class of neutral hydrocarbons containing a potentially planar tetracoordinate carbonMark P. McGrath and Leo RadomCite this: J. Am. Chem. Soc. 1993, 115, 8, 3320–3321Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published in…
Computer codes being developed to improve the understanding of crossed-field amplifier (CFA) performance require a more complete and reliable database of the secondary electron emission properties of the electrode materials than exists in the literature. The authors describe an experimental method and present results…