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 The structural modifications and the phase state of the gelatin matrix during the sol‐gel transition and gelatin gel deswelling were studied by optical rotation and wide‐angle X‐ray scattering (WAXS) methods. It is shown that the quenching of a solution results in rapid renaturation of macromolecular fragment…
The ionic conductivities of halide sodalites, Na8(AlSiO4)6X2, where X2= Cl2, Br2 or I2, have been investigated over the temperature range 200–550 °C in order to study the effect of the anion size on the sodium ion conductivities. The activation energy for conduction was found to decrease over the range 96.6–71.7 kJ mo…
Infrared reflectance and transmittance measurements between 500 and 1800 cm{sup {minus}1} were obtained on boron carbides with between 10 and 20 atomic percent carbon. Measurements on both boron and carbon isotopically enriched samples indicate that all prominent modes involve boron motion, and that all but a mode nea…
Abstract Modern powder diffraction employing computer-controlled diffractometers now allows quantitative analytical methods to use the whole diffraction trace rather then only individual peaks. Two such methods are in common use the Rietveld method which refines the crystal structures of the component phases as part o…
The behavior of encapsulated LaNi5, a typical hydrogen storage alloy, was investigated with the aim of improving unfavorable behavior such as disintegration. A sieved fraction (250/400 mesh) of LaNi5 particles was encapsulated with polystyrene (polymerization degree 1000–1400). The effect of polystyrene/LaNi5 weight r…
Abstract The glacial deposits of Holderness are well displayed along the coast of Humberside from Bridlington to Spurn Head. These deposits consist primarily of tills which may contain chalky debris and include pockets and lenses of sands and gravel. They have been subdivided in the past into four units the Basement,…
Toyohaite, Ag2FeSn3S8, tetragonal, I41⁄a, a=7.464, c=10.80Å, Z=2, is a new mineral corresponding to the Ag analogue of rhodostannite. Microprobe analyses demonstrate partial substitutions of Cu for Ag and Zn for Fe. The most Ag-rich and poor analyses are: Ag 24.39, 16.31; Cu: 0.14, 5.15; Fe 6.28, 6.18; Zn 0.37, 1.29;…
Abstract To prepare thin‐boiling and nongelling adhesives, granular wheat and corn starches were thinned by treatment with aqueous hydrochloric acid or sodium hypochlorite and then hydroxypropylated with propylene oxide. Chlorine oxidation gave more rapid chain cleavage and whiter products with better freeze‐storage s…
A study was made on the effect of cold rolling reductions of 80 to 94% on secondary recrystallization in grain-oriented electrical steel produced by the single-stage cold rolling process. The following conclusions were derived from the study.(1) As the cold rolling reduction increases, secondary-recrystallized grains…
Duplex stainless steel is widely used in various service conditions due to its high mechanical properties and high corrosion resistance. However, there have been few studies on the corrosion resistance of duplex stainless steel in highly oxidizing nitric acid, such as hot nitric acid containing Cr6+ ions. In this stud…
The dynamic-compression properties of carpet are expected to play an important role in their mechanical performance, but it is difficult to measure these properties at frequencies and pressures corresponding to those occurring in carpet wear. A new vibration technique has been developed which enables the dynamic modul…
Structural data have contributed greatly to the understanding of the oxide superconductors. However, it is increasingly clear that a knowledge of the average structure is not sufficient. Structural defects, which are present in essentially all of these systems, have a profound effect on the superconducting properties.
Abstract The magnitudes of the peak intensities in a powder diffraction pattern are not uniformly distributed as a function of diffraction angle. The Lorentz-polarization factor, X-ray form-factor and the thermal vibration parameters all conspire to progressively decrease the intensities of the peaks as sinθ/λ increas…
Experiments in which 25- mu m-thick films of tetrafluoroethylene-per-fluoromethoxyethylene copolymer (Teflon PFA) were charged positively and negatively with a constant-current corona at different temperatures and subsequently discharged are discussed. The time behaviors of surface potential, total current, and conduc…
Infrared spectra of adsorbed dinitrogen on Ru metal supported on Al2O3 and MgO are observed for the first time at 2214 cm–1 for Ru/Al2O3, at 2168 cm–1 for Ru/MgO and at 1910 cm–1 for Ru–CsOH/MgO.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion of bis(2-ethylhexyl) phthalate above and below the glass transition temperature of poly(vinyl chloride)Robson F. Storey, Kenneth A. Mauritz, and Brian B. ColeCite this: Macromolecules 1991, 24, 2, 450–454Publication Date (Print):January 1, 1991Publication History P…
The complexes [Co(pc)(NO2)(py)]·dce, [Co(pc)(NO2)(py)]·thf, and [Fe(pc)(NO2)(py)](pc = phthalocyaninate, py = pyridine, dce = 1,2-dichloroethane and thf = tetrahydrofuran) have been isolated as stable crystalline materials. Their molecular and electronic structures have been investigated by IR and UV/VIS spectra, X-ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrodynamic properties of polystyrene in dilute n-butyl chloride solutionMichael E. Lewis, Shouyan Nan, and Jimmy W. MaysCite this: Macromolecules 1991, 24, 1, 197–200Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 J…
Various organocobalt(III) porphyrins have been synthesized in good yields through the hydrometallation of a hypothetical hydridocobalt(III) porphyrin intermediate.
The state of CuO deposited on alumina depends on the copper loading: at low loadings (CuO content smaller than 6 wt%), copper is present in the form of Cu2+ ions formed by exchange with the hydrogen atoms of the alumina hydroxyl groups, whereas at high loadings, the formation of bulk copper oxide is observed and the h…