Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical reduction of the gold cluster Au9(PPh3)83+. Evidence for an ErErCr mechanism. Formation of the paramagnetic gold cluster Au9(PPh3)82+J. G. M. Van der Linden, M. L. H. Paulissen, and J. E. J. SchmitzCite this: J. Am. Chem. Soc. 1983, 105, 7, 1903–1907Publicati…
We have measured ‘‘in situ’’ the stresses generated in polyimide films produced from the ethyl ester of benzophenone tetracarbolic acid and methylene dianiline during the curing cycle. The room temperature stress in a fully cured film (to 400 °C) is approximately 70 MPa. The stresses at room temperature vary with the…
Synchrotron radiation-excited soft x-ray photoemission is used to study the heterojunction formation of GaAs on Ge(110) by examining 3d-core levels, the valence band (VB), and the secondary electron distribution cutoff in a photoemission spectrum. Arsenic saturation of the Ge(110) surface prior to MBE growth of GaAs c…
The Aquia aquifer in southern Maryland exhibits three regions that are characterized by distinctly different water composition. Region I is about 26 mi (42 km) wide and is parallel to the outcrop area. Water in region I has relatively high calcium (∼30 mg/l), magnesium (∼10 mg/l), and bicarbonate (∼150 mg/l) concentra…
We report on the preparation and properties of "blue" sputtered iridium oxide films (blue SIROF) and compare their properties with those of previous "black" SIROF's as well as anodically grown iridium oxide films (AIROF's). Blue SIROF's are prepared by reactive d‐c sputtering of iridium in argon/oxygen, mixture, at de…
The electron spin resonance (ESR) spectra of the one-electron-reduction products of the 1,2-diphenyl- 1,2-ethenedithiolate complexes M(Ph2C2S2)2 (M = Ni, Pd, Pt) support the view that these reductions are mainly ligand based. Dc cyclic voltammetric studies of the above complexes also show an apparently quasi-reversibl…
Abstract In the crystal of β-(BEDT-TTF)2PF6, BEDT-TTF (bis(ethylenedithiolo)tetrathiafulvalene) molecules are arranged side-by-side. The anisotropy of the electrical resistivity shows that β-(BEDT-TTF)2PF6 is the first organic conductor where the conductivity is the largest along the direction parallel to the molecula…
Abstract Physical aging in polystyrene was studied by annealing samples isothermally (at 22°, 57°, and 93°C) for various lengths of time and measuring the changes in the enthalpy and the flexural creep property. The enthalpy decrease reached a constant value after about 10 hours of aging at 93°C, indicating an apparen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal and mechanical properties of a poly(ethylene oxide-b-isoprene-b-ethylene oxide) block polymer complexed with sodium thiocyanateC. Robitaille and J. Prud'hommeCite this: Macromolecules 1983, 16, 4, 665–671Publication Date (Print):April 1, 1983Publication History Publi…
Oxidation of 1-octene by cytochrome P-450 results concurrently in formation of 1,2-oxidooctane and in N-alkylation by the catalytically activated olefin of the prosthetic heme group. The stereochemistry of trans-1-[1-2H]octene is retained during both transformations. This alkylation stereochemistry requires addition o…
Measurements of the lower yield point in silicon and germanium, covering wide ranges of temperature and strain rate, are presented. The results indicate that Haasen’s model for the beginning of the plastic deformation of semiconductors has to be modified for germanium, while it is confirmed for silicon.
A computer controlled multi-channel PICTS system which allows one to detect many deep trapping levels in high-resistivity bulk material by only a single thermal scanning process, has been developed. In order to obtain the normalized PICTS signal, an automatic gain controlled pre-amplifier has been used. An expanded-sc…
Abstract Dynamic mechanical and optical transparency methods were used to investigate the compatibility of a series of blends of sulfonated cis ‐1,4‐polyisoprene and styrene/4‐vinylpyridine copolymers. It was found that compatibilization occurs at a degree of substitution less than 5%. It is suggested that proton tran…
Although it has become common practice to cover thin film conductors with tough passivation layers, the reliability of the underlying conductor has not been well established. Most investigators have observed an increase in lifetime for stripes covered with glass as compared to uncovered stripes, but have disagreed as…
I M Ward (ed) 1982 London: Applied Science ix + 230 pp price £26 This book, one of a continuing series, reports on the progress of research in six specialised topics in polymer science, each written by active workers in the field covered. Each chapter covers new and often very sophisticated techniques.
Abstract Thermotropic liquid crystal polymers are a new class of polymeric materials that consist of rigid backbone molecules and thus, even in the quiescent condition, take extended chain conformation to form optically anisotropic melts. A systematic investigation was carried out on how this type of material responds…
The need for low carbon and protium inventory at the surfaces of tritium process vacuum components has previously been demonstrated: Radiolytic methane generation and hydrogen isotope exchange lead to contamination of the tritium gas. Significant lengths of small (less than 1/2 in.) stainless steel tubing have, howeve…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature, magnetic field, and high-pressure effects on the optical properties of quasi-one-dimensional crystals: ethylenediammonium tetracyanoplatinate(II)R. Dillinger, G. Gliemann, H. P. Pfleger, and K. KrogmannCite this: Inorg. Chem. 1983, 22, 9, 1366–1369Publication Da…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of static pressure on the intensity and spectral distribution of the sonoluminescence of waterP. K. Chendke and H. S. FoglerCite this: J. Phys. Chem. 1983, 87, 9, 1644–1648Publication Date (Print):April 1, 1983Publication History Published online1 May 2002Published in…
Abstract When natural rubber crystallizes at low temperatures, there is an increase in elastic modulus of up to two orders of magnitude. This phenomenon has been studied at various temperatures in the range 0 to −55°C for samples held at tensile strains of up to 500%. There is an induction period associated with the n…