Materials Literature
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Abstract Hydrogen and hydrogen‐containing species (H 2 O, OH etc.) play a dominant role in the various properties of glass surfaces and technical oxidic thin films deposited on glass. The amount of hydrogen and its distribution with depth are influenced by preparation and production processes, film materials, density…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical deposition of a conducting polymer, poly(thiophene-3-acetic acid): the first observation of individual events of polymer nucleation and two-dimensional layer-by-layer growthFeng Bin Li and W. John AlberyCite this: Langmuir 1992, 8, 6, 1645–1653Publication Dat…
The oxidation reaction equilibrium constant and the holes mobility in p ‐type‐semiconducting SrTiO 3 single crystals were determined directly by simultaneous Hall and conductivity measurements between 500° and 1000°C. This information and the SrTiO 3 defect model were used to interpret the electrical measurements take…
High-speed rotational angioplasty is being evaluated as an alternative interventional device for the endovascular treatment of chronic coronary occlusions. It has been postulated that this type of angioplasty device may produce particulate debris or cavitations that induce myocardial ischemia. To determine the clinica…
Abstract The dynamical behavior of the Bombyx mori silk fibroin chain and of absorbed water in silk fiber, film, and powder has been studied by 1 H pulsed nuclear magnetic resonance (NMR). Segmental motions do not occur and only the rapid rotation of the methyl groups of alanine residues is observed from −120 to 130°C…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlasticization of bacterial poly(3-hydroxybutyrate)Giuseppina Ceccorulli, Maria Pizzoli, and Mariastella ScandolaCite this: Macromolecules 1992, 25, 12, 3304–3306Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992h…
Abstract The surface excesses of Na and Cl on synthetic imogolite and allophanes with varying Al/Si molar ratios in 0.10 M and 0.01 M NaCl solutions were determined using 22 Na and 36 Cl as ion probes. The point of zero net charge (PZNC) values ranged from 4.1 to 8.4, increasing with the Al/Si molar ratio for the allo…
Abstract The expandability of K-depleted biotite and natural vermiculite was studied using transmission electron microscopy (TEM) and X-ray diffraction (XRD). K-depletion in layer-silicates was achieved by treating ultrathin sections with 0·1 m CaCl 2 and BaCl 2 solutions. The natural sample of biotite, which by XRD r…
An unconstrained simulation of the GTP-bound form of the H-ras protein p21 is performed in an aqueous environment with charge-neutralizing counterions. The simulation is compared to the 1.35-A structure of Pai et al. [(1990) EMBO J. 9, 2351] and a proposed alternate structure, in which the loop at residues 60-65 is mo…
The replacement and bypass of arteries of diameter greater than 6 mm with textile vascular prostheses has proved very successful since they were first introduced forty years ago. Although manufacturers continue to improve their products and make them of consistent quality for increased safety and performance and to fa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new fluorinated polyurethane: polymerization, characterization, and mechanical propertiesTai Ho and Kenneth J. WynneCite this: Macromolecules 1992, 25, 13, 3521–3527Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June…
Alkali-metal graphite intercalation compounds undergo a normal-to-superconducting transition at a critical temperature ${\mathit{T}}_{\mathit{c}}$ that increases with increasing alkali-metal concentration. Furthermore, the temperature dependence of the critical magnetic field ${\mathit{H}}_{\mathit{c}2}$ is linear dow…
Abstract An XPS study has been performed on samples of monometallic catalysts of palladium and platinum and on bimetallic Pd‐Pt catalysts supported on pumice. A negative shift of about 0.5 eV in the Pd 3d and Pt 4f binding energies of the catalysts relative to the energies of the same levels in the pure metals suggest…
N-type ZnO thin films with a crack and columnar-free structure were successfully prepared on p-type Si substrates by the sol-gel process. The current-voltage ( I-V ) characteristics of the heterojunction of n-ZnO/p-Si show a rectification with strong electrical breakdown strength of higher than 10 7 V/cm. The capacita…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry of rhodium and cobalt corroles. Characterization of (OMC)Rh(PPh3) and (OMC)Co(PPh3) where OMC is the trianion of 2,3,7,8,12,13,17,18-octamethylcorroleK. M. Kadish, W. Koh, P. Tagliatesta, D. Sazou, R. Paolesse, S. Licoccia, and T. BoschiCite this: Inorg. Che…
The preparation and solid-state characterization of the trifunctional radical 1,3,5-benzenetris(1,2,3,5-dithiadiazolyl) [4,4’,4”-(1,3,5-benzenetriyl)tris[1,2,3,5-dithiadiazolyl], 1,3,5-C6H3(CN2S2)3] are described. The crystals belong to the monoclinic space group P21/c, with a = 6.927 (2), b = 19.798 (3), c = 19.393 (…
The PRO3 gene of Saccharomyces cerevisiae encodes the 286-amino-acid protein delta 1-pyrroline-5-carboxylate reductase [L-proline:NAD(P+) 5-oxidoreductase; EC 1.5.1.2], which catalyzes the final step in proline biosynthesis. The protein has substantial similarity to the pyrroline carboxylate reductases of diverse bact…
Abstract The liquid and solid state tautomerism of 5,10,15,20‐tetraphenylporphyrin‐ 15 N 4 (meso‐tetraphenylporphyrin, TPP) has been studied by dynamic NMR spectroscopy and by NIR spectroscopy. The kinetic HH/HD/DD isotope effects on the liquid state tautomerism were reinvestigated in the temperature region between 20…
We present a new approach to yarn characterization and yarn tensile response based on fiber parameters such as strength and strain-at-break, length, and fineness. Yarn characterization is concerned with twist, linear density, and the ratio of experimental yarn unevenness to the Martindale's limit characteristic for sp…
Abstract It is shown that a quantitative description of the energy‐loss processes in a reflection electron energy‐loss spectroscopy (REELS) experiment cannot be obtained from a simple linear combination of pure bulk and pure surface components. A quantitative description can, however, be obtained within the dielectric…