Materials Literature
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Abstract The thermodynamic significance of the single‐ion activity is limited to its use, through a self‐consistent set of conventions, to predict accurately the activities of electrolytes. Despite this fact, single‐ion activities appear to be of increasing importance in the study of soil‐plant relationships and in th…
The consequences of the avalanche‐breakdown model during the growth of anodic tantalum oxide in electrolytes are discussed. Typical values of the injected current density at the electrolyte‐oxide interface, the impact ionization coefficient, and the electric field during anodization have been determined from the anodi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural chemistry of pentacoordinated silicon. Molecular structures of the pentafluorosilicate anion and the diphenyltrifluorosilicate anionDietmar Schomburg and Roland KrebsCite this: Inorg. Chem. 1984, 23, 10, 1378–1381Publication Date (Print):May 1, 1984Publication His…
Laboratory experiments show that the ion-molecule chemistry of phosphorus is significantly different from that of nitrogen in dense interstellar clouds. The PH<SUB>3</SUB> molecule is not readily formed by gas-phase, ion-molecule reactions in these regions. Laboratory results used in a simple kinetic model indicate th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComputer simulation of kinetics of gelation by addition polymerization in a solventRama Bansil, H. J. Herrmann, and D. StaufferCite this: Macromolecules 1984, 17, 5, 998–1004Publication Date (Print):May 1, 1984Publication History Published online1 May 2002Published inissue 1…
Abstract Interesting polyimide materials, possessing good mechanical and thermal properties, are obtained by homopolymerization or reaction of 4,′4‐bis(maleimidodiphenylmethane) with a diamine. Fourier transform infrared spectroscopy has been used to characterize the crosslinking of such materials using maleimide and…
Abstract Studies in the epoxidation of natural rubber latices are described. Investigated epoxidation routes include the use of bromohydrin intermediates, hydrogen‐peroxide‐catalyzed systems, and preformed peracetic acid. The latter reagent allows almost quantitative epoxidation of natural rubber up to high modificati…
Random fluctuations of the passive current for Fe‐Cr alloys of various Cr content were examined, in borate buffer and in the same solution with 0.1 M NaCl added. Frequency spectra of these fluctuations were recorded before and during pit initiation. No detectable fluctuations were observed in the absence of chlorides,…
TiO 2 is observed as a second phase in SrTiO 3 having Sr/Ti ≤ 0.995 (≥0.5 mol% excess TiO 2 ). The effect of excess TiO 2 on the equilibrium electrical conductivity at 1000°C is consistent with a solubility of <0.1 mol% TiO 2 with the formation of unassociated oxygen vacancies. More Ti0 2 is retained in solid solut…
Abstract The dynamic moduli of isotactic polypropylene (PP) filled with ultrafine SiO 2 and micron sized glass particles are measured in the temperature range 30–130°C at frequency 10 Hz. The storage moduli of PP composites, E′ c , increase with filler content and decreasing filler size in the whole range of temperatu…
The expression of fumarate reductase in Escherichia coli has been amplified over 30-fold by utilizing a recombinant plasmid, pFR63 , carrying the fumarate reductase operon. More than 50% of the inner-membrane protein could be accounted for by the enzyme, whereas the total amount of protein associated with the membrane…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvidence from picosecond transient absorption and kinetic studies of charge-transfer states in copper(II) porphyrinsDongho Kim, Dewey Holten, and Martin GoutermanCite this: J. Am. Chem. Soc. 1984, 106, 10, 2793–2798Publication Date (Print):May 1, 1984Publication History Publ…
Compositions in the series Na 1+x Zr 2 P3‐ x Si x O 12 and Na 1+4z Zr 2 ‐ z P 3 O 12 , where x = 0≤x≤1 and z=0≤z≤1/2, have thermal expansions that can be controlled (by selecting the composition) to values in the range <10×10 ‐7 in a temperature regime of a few hundred degrees. The lowest a values were obtained for…
A method of forming a laser damage resistant wide-spectrum antireflective coating on fused silica and other glasses has been developed. The single-layer graded-index coating is deposited from a specific polymer solution which is converted to a porous SiO2 film. The size of the pores in the film is first reduced by hea…
50 keV Ar + or focused Au + were irradiated in a trimethyl aluminum atmosphere to investigate characteristics of ion beam assisted deposition. About 80 nm thick films were deposited at a dose of 1×10 16 /cm 2 . The film composition and its depth dependence was measured by Auger electron spectroscopy. It was found that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel clathrate design: selective inclusion of uncharged molecules via the binaphthyl hinge and appended coordinating groups. X-ray crystal structures and binding modes of 1,1'-binaphthyl-2,2'-dicarboxylic acid host/hydroxylic guest inclusionsEdwin Weber, Ingeborg Csoregh,…
The quasi-one-dimensional compound CuMn${({\mathrm{S}}_{2}{\mathrm{C}}_{2}{\mathrm{O}}_{2})}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}7.5${\mathrm{H}}_{2}$O was synthesized, and its magnetic susceptibility ${\ensuremath{\chi}}_{M}$ was measured in the temperature range $T=4.2\ensuremath{-}240$ K. The curve ${\ens…
ADVERTISEMENT RETURN TO ISSUEPREVArticleModel catalytic studies over metal single crystalsD. Wayne GoodmanCite this: Acc. Chem. Res. 1984, 17, 5, 194–200Publication Date (Print):May 1, 1984Publication History Published online1 May 2002Published inissue 1 May 1984https://pubs.acs.org/doi/10.1021/ar00101a007https://doi.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTForces between two adsorbed poly(ethylene oxide) layers in a good aqueous solvent in the range 0-150 nmJacob Klein and Paul F. LuckhamCite this: Macromolecules 1984, 17, 5, 1041–1048Publication Date (Print):May 1, 1984Publication History Published online1 May 2002Published i…
The continuous sequence of 2.3 kilobases in a 3-kilobase DNA fragment encoding the structural gene for coliphage T4 thymidylate synthase (5,10-methylenetetrahydrofolate:dUMP C-methyltransferase, EC 2.1.1.45) was determined by using the M13 dideoxy chain-termination method. From the coding information within this gene…