Materials Literature
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Superelastic nickel-titanium archwires, unlike conventional wires, are capable of withstanding very large deflections and on returning to their original shape on deactivation will produce more moderate forces. The region over which there is a 'plateau' depends on the deflection and is greater the larger the deflection…
A simple refinery-specific correlation has been established between the total fouling rate and tube wall temperature of individual heat exchangers in the preheat exchanger train of a crude oil distillation unit. The correlation has been obtained from plant data, and has subsequently been used successfully to predict t…
The hardest known materials , diamond and cubic boron nitride, are thermodynamically stable only at high pressure and temperature. Chemical vapor deposition and sputtering have offered low‐pressure alternatives to the traditional synthetic methods and these techniques have recently been exploited for the production of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTValence contrast by synchrotron resonance scattering: application to a mixed-valence manganese compoundY. Gao, A. Frost-Jensen, M. R. Pressprich, P. Coppens, A. Marquez, and M. DupuisCite this: J. Am. Chem. Soc. 1992, 114, 23, 9214–9215Publication Date (Print):November 1, 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall-angle neutron scattering evaluation of the temperature dependence of atactic polypropylene and poly(1-butene) chain dimensions in the meltA. Zirkel, V. Urban, D. Richter, L. J. Fetters, J. S. Huang, R. Kampmann, and N. HadjichristidisCite this: Macromolecules 1992, 25,…
The gene encoding methylaspartase (EC 4.3.1.2) from Clostridium tetranomorphum has been cloned, sequenced, and expressed in Escherichia coli. The open reading frame (ORF) codes for a polypeptide of 413 amino acid residues (M(r) 45,539) of which seven are cysteine residues. The size of the ORF indicates that methylaspa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox chemistry of water-soluble iron, manganese, and chromium metalloporphyrins and acid-base behavior of their lyate axial ligands in aqueous solution: influence of electronic effectsSeungwon Jeon and Thomas C. BruiceCite this: Inorg. Chem. 1992, 31, 23, 4843–4848Publicati…
ABSTRACT: Copper(II) removal efficiency by vermiculite has been investigated through laboratory experiments. The removal phenomenon appears to be consistent with an ion‐exchange (exchange adsorption) process. The batch sorption equilibria follows Freundlich adsorption isotherm. The uptake of copper(II) is a function o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBarium lanthanum copper tin oxide (Ba2La2Cu2Sn2O11): a new layered perovskite with a modulated structureMark T. Anderson, Kenneth R. Poeppelmeier, Jin Ping Zhang, Han Jie Fan, and Laurence D. MarksCite this: Chem. Mater. 1992, 4, 6, 1305–1313Publication Date (Print):November…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR and ENDOR study of selected porphyrin- and phthalocyanine-copper complexesS. P. Greiner, D. L. Rowlands, and R. W. KreilickCite this: J. Phys. Chem. 1992, 96, 23, 9132–9139Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published in…
Usually the shape of the glass transition dispersion in the mechanical or dielectric spectra of pure polymers is skewed toward higher frequencies. In miscible polymer blends not only is this peak broader than in pure polymers, the broadening is often asymmetric towards lower frequencies. Concentration fluctuations are…
Molecular design, microstructure, and physical properties of polymers are strongly related to each other. A better understanding of their interdependence will give the polymer chemist useful ideas for the synthesis of new macromolecules. The present paper aims to compare the thermal behavior of aryl polycondensates ba…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural characterization of pyrazole-bridged metalla-bis(dicarbollide) derivatives of cobalt, nickel, copper, and iron: models for venus flytrap cluster reagentsAravamuthan Varadarajan, Stephen E. Johnson, Frank A. Gomez, Sarmistha Chakrabarti, Carolyn B. Kn…
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 .…