Materials Literature
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A new technique for the preparation of porous vascular prostheses was investigated. Polyurethane solution (5 to 15 wt%) was injected into a mold. After freezing at low temperature (0 degrees C-196 degrees C), solvents were dissolved out with water at 0 degrees C to form porous tubes. The average pore size (several mic…
A new reflectance anisotropy (RA) spectrometer, in the 0.23–0.83-μm range, is presented. The numerous similarities with phase-modulated ellipsometry (PME) are emphasized. In particular, the RA spectrometer takes advantage of the high-frequency modulation (50 kHz) provided by a photoelastic modulator. The use of optica…
The seasonal changes in communities of benthic diatoms colonizing glass slides were observed in Aburatsubo Bay, Kanagawa Prefecture, Japan. Once every month during the study periods June 1984 to July 1985 and February to October 1987, glass slides were immersed at 1 m depth for 10 days. Thirty diatom species belonging…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties of a dodecanuclear polyoxovanadate with exchange and electron delocalization effectsAnne Laure Barra, Dante Gatteschi, B. S. Tsukerblatt, Joachim Doering, Achim Mueller, and Louis Claude BrunelCite this: Inorg. Chem. 1992, 31, 24, 5132–5134Publication Dat…
The solidification process of liquid garnets Ln 3 Al 5 O 12 (Ln = Dy, Y, Lu) was probed by differential thermal analysis. A critical temperature T clg was evidenced in the liquid. Cooling from temperatures under T clg leads to the crystallization of the single garnet phase. Cooling from temperatures above T clg leads…
The kinetics of electron transfer between electrochemically passivated chromium and several outer‐sphere redox couples have been investigated as a function of passive‐film thickness, to 25 Å, in . The apparent rate of electron transfer decreased exponentially with increasing thickness of the passivating overlayer. Sim…
Abstract A.C. impedance spectroscopy was used to characterise the electrical conductivity behaviour of polycrystalline β‐LiAlSi 2 O 6 , β‐LiAlSiO 4 and the corresponding glasses with identical stoichiometric compositions. Two bulk conduction processes with different activation energies were detected for β‐LiAlSiO 4 .…
Advances have been made in the electronic characterization and analysis of thin-film ferroelectric (FE) memory capacitors using capacitance vs. voltage (C-V) measurements. A mathematical model of the small-signal electrical behavior of the FE capacitor has been developed. This analysis shows that the small-signal char…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFourier-transform infrared and electron spectroscopy for chemical analysis studies of block copolymers of styrene and dimethylsiloxaneXin Chen, Joseph A. Gardella Jr., and Philip L. KumlerCite this: Macromolecules 1992, 25, 24, 6621–6630Publication Date (Print):November 1, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of the changes occurring on reduction and reoxidation of CuY zeolitesJuan O. Petunchi, George Marcelin, and W. Keith HallCite this: J. Phys. Chem. 1992, 96, 24, 9967–9975Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConducting polymer blends: polypyrrole and poly(vinyl methyl ketone)Hsing Lin Wang and Jack E. FernandezCite this: Macromolecules 1992, 25, 23, 6179–6184Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November 1992ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPartial paramagnetism of the chromium-chromium quadruple bondF. Albert Cotton, Hong Chen, Lee M. Daniels, and Xuejun FengCite this: J. Am. Chem. Soc. 1992, 114, 23, 8980–8983Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and spectroscopic study of the transport properties of composite polymer electrolytesF. Croce, B. Scrosati, and G. MariottoCite this: Chem. Mater. 1992, 4, 6, 1134–1136Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetamagnetic properties of a family of ferromagnetic alternating spin chains: bis(dimethylglyoximato)(carboxylato)manganese(III)copper(II)Francesc Lloret, Rafael Ruiz, Miguel Julve, Juan Faus, Yves Journaux, Isabel Castro, and Michel VerdaguerCite this: Chem. Mater. 1992, 4,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCooperative structure formation by directed noncovalent interactions in an unpolar polymer matrix. 7. Differential scanning calorimetry and small-angle x-ray scatteringChristopher Hilger and Reimund StadlerCite this: Macromolecules 1992, 25, 24, 6670–6680Publication Date (Pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermogravimetric analysis/mass spectrometry investigation of the thermal conversion of organosilicon precursors into ceramics under argon and ammonia. 2. Poly(silazanes)N. S. Choong Kwet Yive, R. J. P. Corriu, D. Leclercq, P. H. Mutin, and A. ViouxCite this: Chem. Mater. 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetalloradical reactions of rhodium(II) porphyrins with acrylates: reduction, coupling, and photopromoted polymerizationBradford B. Wayland, George Poszmik, and Michael FrydCite this: Organometallics 1992, 11, 11, 3534–3542Publication Date (Print):November 1, 1992Publication…
Abstract The rheological behavior of wood fiber/polyethylene composites made of corona treated constituents was investigated. Corona treatment of one or both of the constituents resulted in decreased melt viscosities relative to compounds containing untreated materials. The reduction of melt viscosity may originate fr…
Abstract The effect of a cold remote N 2 plasma (CRNP) or N 2 + O 2 plasma (CRNOP) on poly(ether ether ketone) (PEEK) is studied. The amount of nitrogen or oxygen uptake and functionalities are determined by x‐ray photoelectron spectroscopy (XPS). After CRNP treatment, the N/C and O/C atomic ratios are 0.301 and 0.333…
Surface-mediated alignment of nematic liquid crystals with polarized laser light was reported recently [1]. In this communication we describe the alignment of a guest–host liquid crystal medium with polarized laser light. Liquid crystals in the illuminated region orient perpendicular to the direction of the laser pola…