Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApproaches to orthogonally fused conducting polymers for molecular electronicsJames M. Tour, Ruilian Wu, and Jeffry S. SchummCite this: J. Am. Chem. Soc. 1990, 112, 14, 5662–5663Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inis…
Abstract The energies of photoelectron and Auger lines of gallium and nitrogen in GaN thin films obtained by reactive sputtering are derived. From previous RBS investigations, such were found to be stoichiometric in the bulk. The XPS surface analysis of the films gives a chemical content of ∼20% gallium oxide. Depth p…
Abstract A commercial platinized tin oxide catalyst used for low‐temperature CO oxidation has been characterized using ion scattering spectroscopy, Auger electron spectroscopy and electron spectroscopy for chemical analysis before and after reduction in 40 Torr of CO for 1 h at various temperatures in the range 75–175…
Abstract PTFE was treated with oxygen and argon plasmas and the effects of treatment were evaluated by actinometry, SEM, XPS, static SIMS and contact angle measurements. At short treatment times for both plasmas and at long treatment times for argon plasmas, chemical modification of the surface was dominant, while at…
The oxidation rate of TiCl 4 vapor was measured by FTIR spectroscopy between 700° and 1000°C in a furnace aerosol reactor. The reaction rate was found to be first order with respect to TiCl 4 and to follow the Arrhenius form. The apparent activation energy for the reaction was 88.8 ± 3.2 kJ/mol and the preexponential…
The accuracy and limitations of phase-shift analysis of modulated photocurrents as a means of determining the energy profile of localized states in amorphous semiconductors have been investigated. The basis of the existing ‘recursion procedure’ is reviewed and its deficiencies are revealed by applying the method to co…
The sequence of stages during precipitation of semiconductor (e.g., CdS, CdSe) clusters from supersaturated glasses exhibiting quantum-confinement effects was investigated. The rate of formation of nanometer-size ‘‘quantum dots’’ distributed in a continuous glass matrix is critically determined by the time and tempera…
Two synthetic peptides containing the previously identified calmodulin (CaM)-binding domain of Ca2+/CaM-dependent protein kinase II (CaM-kinase II) (residues 296-309, Payne, M. E., Fong, Y.-L., Ono, T., Colbran, R. J., Kemp, B. E., Soderling, T. R., and Means, A. R. (1988) J. Biol. Chem. 263, 7190-7195) were phosphory…
The results of a study on the loss and recovery of hydrophobicity of RTV (room-temperature vulcanizing) silicone-rubber insulator coatings in a salt-fog chamber are reported. The results complement those previously reported on the ability of the coatings to suppress leakage current and insulator flashover. The tempora…
The wettability of aged surfaces and of the bulk of naturally aged silicone and EPDM (ethylene-propylene diener monomer) insulator housings and silicone elastomer insulator coatings was studied. The samples were taken either directly from the insulators or treated by exposing them to corona discharges and/or to saline…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBulk and nanostructure Group II-VI compounds from molecular organometallic precursorsJ. G. Brennan, T. Siegrist, P. J. Carroll, S. M. Stuczynski, P. Reynders, L. E. Brus, and M. L. SteigerwaldCite this: Chem. Mater. 1990, 2, 4, 403–409Publication Date (Print):July 1, 1990Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolten alkali-metal polychalcogenides as reagents and solvents for the synthesis of new chalcogenide materialsMercouri G. KanatzidisCite this: Chem. Mater. 1990, 2, 4, 353–363Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inissue…
Dispersion of an elastic wave propagating in a 76.2-mm-diameter (3 in.) Split Hopkinson Pressure Bar system was investigated with two consecutive pulses recorded in the transmitter bar. Assuming that the dispersive high frequency oscillatory components riding on the top of the main pulse originate from the first mode…
Digital imaging is used to study the instantaneous particle positions and trajectories of highly charged monodisperse 0.3-\ensuremath{\mu}m-diam polystyrene spheres in water suspension. We find that a three-dimensional fcc crystal near a smooth glass wall melts abruptly into a layered fluid as a function of the in-pla…
An exact closed-form formula is given for the energy of an array of dislocations, arranged periodically on the interface between an epitaxial layer and its substrate, when these are modelled as elastically isotropic with the same elastic constants. In the course of the formulation, the exact equivalence of equilibrium…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLocal structure of semiflexible polymer meltsKevin G. Honnell, John G. Curro, and Kenneth S. SchweizerCite this: Macromolecules 1990, 23, 14, 3496–3505Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inissue 1 July 1990https://doi.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConvergent synthesis of monodisperse dendrimers based upon 1,3,5-trisubstituted benzenesTimothy M. Miller and Thomas X. NeenanCite this: Chem. Mater. 1990, 2, 4, 346–349Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inissue 1 Jul…
Using the generalized Landau model [Phys. Rev. A 36, 1484 (1987)], the temperature and frequency dependence of the complex dielectric constant of the ferroelectric smectic-${\mathit{C}}^{\mathrm{*}}$ (Sm-${\mathit{C}}^{\mathrm{*}}$) phase and the corresponding smectic-A (Sm-A) phase is calculated. It is demonstrated h…
Two synthetic routes have been developed to produce high‐molecular‐weight organic precursors containing a high weight fraction of nitrogen. One of the precursors is a pyrolysis residue of melamine‐formaldehyde resin. The second precursor is the byproduct of an unusual low‐temperature combustion reaction of tetrazole a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBond strengths of ethylene and acetyleneKent M. Ervin, Scott Gronert, S. E. Barlow, Mary K. Gilles, Alex G. Harrison, Veronica M. Bierbaum, Charles H. DePuy, W. C. Lineberger, and G. Barney EllisonCite this: J. Am. Chem. Soc. 1990, 112, 15, 5750–5759Publication Date (Print):…