Materials Literature
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Abstract The first stage of lateritic weathering of pyroxenes in the Niquelandia area, Brazil, leads either to Fe-rich products or to a phyllosilicate clay. In relatively unfractured parent rock the phyllosilicate clay contains Ni-rich smectites, the atomic ratio of Ni: octahedral cations ranging from 0.3 to 0.5. Thes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational spectra of magnesium-sodium-borate glasses. 1. Far-infrared investigation of the cation-site interactionsE. I. Kamitsos, G. D. Chryssikos, and M. A. KarakassidesCite this: J. Phys. Chem. 1987, 91, 5, 1067–1073Publication Date (Print):February 1, 1987Publication H…
Infrared properties and electro-optic effects of nematic liquid crystals are reviewed. Physical origins and characterization techniques of infrared birefringence and rotatory power are described. Advantages and disadvantages of three device configurations--parallel, twisted, and perpendicular alignments--are analyzed.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of a novel cross-conjugated conductive polymer precursor: poly(3,4-diisopropylidenecyclobutene)Timothy M. Swager and Robert H. GrubbsCite this: J. Am. Chem. Soc. 1987, 109, 3, 894–896Publication Date (Print):February 1, 1987Publication History Publis…
Polyimides derived from condensation of pyromellitic dianhydride with various diamines have been shown to be electrochemically active. Films of these materials coated on the surface of solid electrodes, immersed in electrolyte solutions of dipolar aprotic solvents undergo two distinct reversible redox processes, invol…
Abstract Various blends of ultra‐high molecular weight polyethylene (UHMWPE) with linear low‐density polyethylene (LLDPE) were prepared in an internal (Banbury type) mixer, a static mixer, and by solvent blending. Two mixing techniques, namely simultaneous and sequential loading methods, were employed with the interna…
Bubble fields generated in a liquid (water) irradiated with sound of high intensity are investigated by high-speed holographic cinematography at framing rates up to 69?0 holograms per second. The period-doubling route to chaos found previously in the sound output from the liquid also shows up in the bubble oscillation…
In glasses, the largest observed value of nonlinear refractive index n2 is currently about 0.1 X10-11 esu. Changes in n2 are dependent on the third-order electronic polarization, which can be estimated from the linear electronic polarizability or from the refractive index and Abbe number. Theoretical calculations of n…
An analytical formulation is presented for the computation of scattering and transmission by general anisotropic stratified material. This method employs a first-order state-vector differential equation representation of Maxwell's equations whose solution is given in terms of a <tex xmlns:mml="http://www.w3.org/1998/M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable-temperature magnetic, spectral, and x-ray crystallographic studies of "spin-crossover" iron(III) Schiff-base-Lewis-base adducts. Influence of noncoordinated anions on spin-state interconversion dynamics in [Fe(salen)(imd)2]Y species (Y = ClO4-, BF4-, PF6-, BPh4-; im…
The use of Pb(Zn 1/3 Nb 2/3 )O 3 ceramics is restricted by the formation of a pyrochlore phase detrimental to both dielectric and piezoelectric properties. Recently it has been shown that a 6 mol% addition of BaTiO 3 to PZN suppresses the formation of pyrochlore phase. Phase relations and dielectric properties of cera…
A soda‐lime‐silica glass was subjected to an ordinary ion exchange treatment in molten potassium nitrate at temperatures near and substantially below the strain point of the glass. Stress profiles were measured as a function of exchange temperature and time. At all temperatures, the measurements showed rapid relaxatio…
Founded in 1683 in Leiden, the Netherlands, Brill is a leading international academic publisher in the Humanities, Social Sciences, International Law, and Biology. With offices in the Netherlands, Germany, Austria, the USA and Asia, Brill today publishes more than 360 journals and 2,000 new books and reference works e…
LiH has great potential as a high capacity hydrogen storage material (12 wt.%), however its thermodynamic stability has so far precluded practical application. Temperatures near 700 °C are required for hydrogen release and uptake. Herein, we report on a novel method to realise hydrogen uptake and release under milder…
The electrochemistry of 9, 16, 23-TETRA(NEOPENTOXY)PHTHALOCYANATO cobalt, and some binuclear analogs, has been studied in dichlorobenzene and in dimethylformamide. The redox mechanisms and species on the electrode are discussed. Using an optically thin electrode, the electronic spectra of seven different oxidation sta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhthalocyanine .pi.-cation-radical species: photochemical and electrochemical preparation of [ZnPc(-1).+ in solutionTebello Nyokong, Zbigniew Gasyna, and Martin J. StillmanCite this: Inorg. Chem. 1987, 26, 4, 548–553Publication Date (Print):February 25, 1987Publication Histo…
Abstract The structure‐property relationship as well as the failure phenomena of injection molded polypropylene (PP) blends modified with ethylene/propylene/diene terpolymer (EPDM) and thermoplastic polyolefinic rubber (TPO) were investigated. Single and double‐gated tensile bars were injection molded by different Inj…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline solvents as mechanistic probes. 24. A novel gelator of organic liquids and the properties of its gelsYih Chyuan. Lin and Richard G. WeissCite this: Macromolecules 1987, 20, 2, 414–417Publication Date (Print):February 1, 1987Publication History Published on…
This study examines the effect of in vitro exposure to enzymes on the performance properties of Biomer, a segmented polyetherurethane used in a number of blood-contacting devices such as catheters, heart assist pumps, and chambers for artificial hearts. The ultrathin samples were treated with two proteolytic enzymes,…
The equilibrium electrical conductivity of polycrystalline, calcium‐doped BaTiO 3 was studied over the oxygen partial pressure range 10 ‐13 to 10 5 Pa and the temperature range 800° to 1000°C. There is little effect if CaO is substituted for a corresponding amount of BaO, i.e., Ba, 1‐x Ca x TiO 3 . If CaO is substitut…