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 Scanning electron microscopy (SEM) was used to study the mechanism of falling‐strand devolatilization of polymer melts. Polystyrene and low‐density polyethylene were enriched with styrene and hexane, respectively, and were subsequently extruded as thin strands at various conditions. The polymer strands were e…
Resistivity and Seebeck coefficients are reported in the range 50 KT300 K for zinc ferrite single crystals ${\mathrm{Fe}}_{3\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Zn}}_{\mathit{x}}$${\mathrm{O}}_{4}$ in the composition range 0\ensuremath{\le}x0.3. Samples with 0x\ensuremath{\lesssim}0.012 exhibited first-order p…
Abstract Novel acrylic monomers bearing a monosaccharide residue were synthesized in reactions of some methyl glycosides with 2-hydroxylethyl acrylate or methacrylate in the presence of heteropoly acid. All of them were highly soluble in water and readily polymerized by radical initiators.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of the new highest Tc ambient-pressure organic superconductor, .kappa.-(BEDT-TTF)2Cu[N(CN)2]Br, by five different routesHau H. Wang, Aravinda M. Kini, Lawrence K. Montgomery, Urs Geiser, K. Douglas Carlson, Jack M. Williams, James E. Thompson, Diana M. Watkins, W.…
An indirect method of experimentally measuring the moment-curvature relationship for fabrics is developed in this study. The new test method involves recording the deformed coordinates of a fabric sample as it is cantilevered under its own weight from a fixed support. By applying least squares polynomial regression an…
Abstract The aim of this x‐ray diffraction investigation is to establish a comparison between the structure of collagen and that of gelatin gels. The gelatin gels are drawn into fibers, which are dried before use. The xray scattering patterns of the gelatin fibers show a close analogy with collagen, which provides evi…
The kinetics of seeded emulsion homopolymerization are modeled by formulation and solution of the reaction-diffusion equations describing the monomer and free-radical distributions within the latex particles. The simulations predict significant inhomogeneities may develop at high conversion, giving rise to core-shell…
The compositional range for glass formation below 1600°C in the Sm 2 O 3 ─Al 2 O 3 ─SiO 2 system is (9–25)Sm 2 O 3 ─(10–35)Al 2 O 3 ─(40–75)SiO 2 (mol%). Selected properties of the Sm 2 O 3 ─Al 2 O 3 ─SiO 2 (SmAS) glasses were evaluated as a function of composition. The density, refractive index, microhardness, and th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman pursuit of the change from iron(II)-oxygen (FeII-O2) to iron(III)-hydrohxyl (FeIII-OH) via iron(IV):oxygen (FeIV:O) in the autoxidation of ferrous iron-porphyrinY. Mizutani, S. Hashimoto, Y. Tatsuno, and T. KitagawaCite this: J. Am. Chem. Soc. 1990, 112, 19,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEfficient evaluation of poly(oxyethylene) complex formation with alkali-metal cationsTetsuo OkadaCite this: Macromolecules 1990, 23, 19, 4216–4219Publication Date (Print):September 1, 1990Publication History Published online1 May 2002Published inissue 1 September 1990https:/…
The effects of nine metal cations (Li + , Na + , Mg 2+ , Ca 2+ , Sr 2+ , Cu 2+ , Al 3+ , La 3+ , and Y 3+ ) on silica gel formation have been investigated by studying the hydrolysis and polycondensation of silicon tetraethoxide (TEOS) in the presence of metal nitrates. The influence of the water: TEOS mole ratio, meta…
Abstract The performance of silanes as coupling agents in hardwood aspen fibers (chemithermomechanical pulp and sawdust)—polyvinyl chloride composites, have been investigated. Aside from the chemical structure of silanes, the dispersion aids, e.g. solvent, initiator (different organic peroxides) and maleic anhydride (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic interactions in bimetallic systems: an x-ray photoelectron spectroscopic studyJose A. Rodriguez, Robert A. Campbell, and D. Wayne. GoodmanCite this: J. Phys. Chem. 1990, 94, 18, 6936–6939Publication Date (Print):September 1, 1990Publication History Published onlin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAzulenic retinoids and the corresponding bacteriorhodopsin analogs. Unusually red-shifted pigmentsAlfred E. Asato, Xiao Yuan Li, Dennis Mead, G. M. L. Patterson, and Robert S. H. LiuCite this: J. Am. Chem. Soc. 1990, 112, 20, 7398–7399Publication Date (Print):September 1, 19…
Several errors inherent to the Fourier transform method for optical thin film synthesis, including the inaccuracy of the spectral functions Q (sigma) used in the Fourier transforms, are compensated numerically by using successive approximations. We show that the complex phase of Q (sigma) is a key parameter which can…
The equilibrium binding of hydroxyethyl vinyl deuteroporphyrin (HVD) and of irreversible porphyrin aggregates to human serum albumin was studied at the molecular level. This protein may function as an endogenous drug carrier for porphyrins in photodynamic therapy of tumours. HVD-protein binding studies revealed two ty…
A semi-empirical sputtering model is demonstrated to provide a good description of electron-induced secondary electron emission. A simple formula for the yield of secondary electrons as a function of primary energy, incident angle, and material parameters is obtained. In comparison to the most commonly employed semi-e…
A linear stepper motor capable of submicrometer controlled movement has been constructed using the piezoelectric material lead zirconate titanate (PZT). This motor consists of a 25.4-mmx12.7-mmx1.6-mm piezoelectric driving element connected between a glider base and an attached load. The device is inset in a trench to…
The role of fluid flow and heat transfer in determining the quality of the diamond films and the rate of their deposition in a hot-filament chemical vapor deposition (HFCVD) reactor was investigated both experimentally and theoretically. The equations of conservation of mass, momentum, and enthalpy were solved numeric…
The directed oxidation of some molten aluminum alloys was studied. Alloys containing Si, Zn, and Mg are readily converted into Al 2 O 3 /Al composites with the characteristic directed metal oxidation process (DIMOX) metal‐channel structure. No reaction took place when alloys without Mg were used. However, when Mg‐free…