Materials Literature
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Unlike constant moisture effects on the behavior of composite materials, transient moisture effects are not well studied and known. Armstrong and Kingston have shown that the creep of wood under transient humidity levels could be greatly accelerated over that at any constant moisture content. Later this phenomenon was…
Detailed stratigraphic and taxonomic analyses were made of small Stephanodiscus and Cyclostephanos species in the recent sediments of a small eutrophic lake (Lough Augher, Co. Tyrone, N. Ireland). The morphological variety present was assessed by LM and SEM studies of sediment depths with high valve concentrations. Th…
Dip‐coated sol–gel‐derived TiO 2 films on an alumina substrate were converted to nonstoichiometric titanium nitride (TiN x ( x ≦ 1)) films by heating at approxmately 1000°C in NH 3 gas. TiO 2 films made from TiO 2 sols prepared from Ti(O– i ‐C 3 H 7 ) 4 and stabilized by diethanolamine were more easily nitrided than t…
Abstract The structure of Silica Springs allophane from New Zealand has been studied by high-resolution 27 A1 and 29 Si NMR spectroscopy, IR spectroscopy and electron microscopy. Experimental NMR conditions were chosen to give a quantitative relationship between signal strength and Al content. Aluminium is present in…
Economic, safety and environmental prospects of fusion reactors, Conn, R.W., Holdren, J.P., Sharafat, S., Steiner, D., Ehst, D.A., Hogan, W.J., Krakowski, R.A., Miller, R.L., Najmabadi, F., Schultz, K.R.
The $^{35}\mathrm{Cl}$ nuclear quadrupole resonance spectrum of a single crystal of sodium chlorate [R. Tycko, Phys. Rev. Lett. 58, 2281 (1987)] rotating about two axes reflects a non-Abelian gauge potential. This gauge potential is an example of Wilczek and Zee's [Phys. Rev. Lett. 52, 2111 (1984)] generalization of B…
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…