Materials Literature
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Abstract Synthetic hydrotalcite, Mg6Al2(OH)16CO3·4H2O, and its analogues were synthesized, heat-treated at 773 K, and used as catalysts for the title reaction to form methyl vinyl ketone (MVK) at 673 K. MVK was formed over all the catalysts examined, the highest MVK yield (20% on acetone basis) being found over the he…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural characterization by EXAFS spectroscopy of the binuclear iron center in protein A of methane monooxygenase from Methylococcus capsulatus (Bath)Agneta. Ericson, Britt. Hedman, Keith O. Hodgson, Jeffrey. Green, Howard. Dalton, James G. Bentsen, Robert H. Beer, and St…
Abstract The crystal structures of an organic superconductor (BEDT-TTF)2Cu(NCS)2 (Tc=10.4 K) at 298 K and 104 K are determined by X-ray analysis. The packing pattern of donors is nearly analogous to κ-(BEDT-TTF)2I3. The counter anion, Cu(NCS)2−, has no positional disorder and constructs a peculiar sheet where a copper…
A newly defined chick calvariae osteoblast culture system that undergoes a temporal sequence of differentiation of the osteoblast phenotype with subsequent mineralization (Gerstenfeld, L. C., S. Chipman, J. Glowacki, and J. B. Lian. 1987. Dev. Biol. 122:49-60) has been examined for the regulation of collagen synthesis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular and macromolecular nonlinear optical materials. Probing architecture/electronic structure/frequency doubling relationships via an SCF-LCAO MECI .pi. electron formalismDe Quan. Li, Mark A. Ratner, and Tobin J. MarksCite this: J. Am. Chem. Soc. 1988, 110, 6, 1707–171…
We have grown diamond crystals and polycrystalline diamond films from CH4/H2/O2 gas feeds in a simple, high-power density, 2450-MHz discharge tube reactor. Single-crystal growth rates over 20 μm/h have been achieved. The material has been analyzed using Raman spectroscopy, Auger spectroscopy, and x-ray diffraction. Co…
Abstract An attempt is made to give a survey of polymer processing during the past 50 years, with a backward glance to earlier periods and to roots of development in related branches of industrial production. Selected topics are treated in some detail, with comments and comparisons, showing typical trends and forecast…
Abstract The relationship between the stress relaxation phenomena and domain structure of thermoplastic elastomer (TPE) was studied. Two representative thermoplastic elastomers: styrenebutadiene‐styrene block copolymer (SBS) and 1,2‐syndiotactic polybutadiene (1,2‐PB), representing the amorphous glassy domain and crys…
Abstract The interband absorption coefficient of GeSe single crystals near the fundamental absorption edge is analyzed on the basis of a two‐dimensional model and is found to correspond to an indirect forbidden transition. The optical energy gap at room temperature is found to be (1.066 ± 0.011) and (1.078 ± 0.010) eV…
ADVERTISEMENT RETURN TO ISSUEPREVArticleRing dynamics in a crystalline analog of bisphenol A polycarbonateP. Mark Henrichs and Henry R. LussCite this: Macromolecules 1988, 21, 3, 860–862Publication Date (Print):March 1, 1988Publication History Published online1 May 2002Published inissue 1 March 1988https://pubs.acs.or…
The concept of polarization resistance is introduced, considering a real current-voltage characteristic of the electrochemical system. Then some mathematical methods, developed by the author and not currently available in literature, are discussed, which allow its evaluation. The numerical methods considered are linea…
Abstract Soil samples were collected by horizon from three pedons that formed an Argialboll‐Argiaquoll sequence. The soil samples were mechanically dispersed in distilled water and samples of the clay fraction were separated by sedimentation. Portions of these clay samples were given various standard pretreatments and…
The microstructure of a sintered magnet made from Zr-containing NdFeB material was investigated using optical microscopy and scanning and transmission electron microscopy. The authors observed three phases in addition to those found in the ternary alloy. Two of these phases were Zr-rich, one having a lamellar structur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntrachain rotations in the poly(ester carbonates). 2. Quantum-mechanical calculations on large model molecules fully representing each type of phenyl ring environmentJozef Bicerano and Hayden A. ClarkCite this: Macromolecules 1988, 21, 3, 597–603Publication Date (Print):Mar…
Abstract Methods are described for the preparation of cobalt(II) deuteroporphyrin and cobalt(II) tetrakis(p-sulfonatophenyl)porphine anchored on alumina beads coated with polyaminesulfone-A. Wavelength dispersive X-ray microanalysis showed that the cobalt(II) porphine distributes within the catalyst outer surface laye…
It is well known that Rb3H(SeO4)2 experiences two reversible phase transitions I↔II (at 606 K) and II↔III (at 448.5 K) /1,2/.
Fabrics used in firefighters' protective clothing were exposed to simulated sunlight from a xenon are Weather-Ometer and heat in a forced air circulating oven, and the resulting changes in properties were measured (color, tearing strength, flame resistance and thermal protective performance). The thermal shrinkage and…
Abstract Fast breeder reactors use liquid sodium metal as the coolant in their primary and secondary circuits. Corrosion behaviour and compatibility of structural materials in sodium at the operating temperature of the reactors has been found to be influenced by oxygen impurity in sodium even at parts per million leve…
The purpose of this report is to present evidence supporting the thesis that the major mode of penetration of nylon ballistic panels by fragment-simulating projectiles is a cutting, shearing mechanism: Shear forces required for yarn failure are usually less than tensile forces. Penetration is always at a slight angle,…
Single crystals of Mg 1‐ x Fe x O, x = 0.01, have been oxidized in air at temperatures between 1146 and 1389 K to determine the kinetics of the internal oxidation reaction. A two‐phase region composed of MgFe 2 O 4 precipitates in a (Mg, Fe)O matrix grows inward from the surface as the reaction progresses. The thickne…