Showing papers by "Shimshon Gottesfeld published in 1990"
TL;DR: In this article, the authors reported a significant increase in the density of an electrochemically grown conducting polymer film obtained by preadsorbing a self-assembling monolayer onto the surface of the electrode substrate.
Abstract: The authors report in this communication on a significant increase in the density of an electrochemically grown conducting polymer film obtained by preadsorbing a self-assembling monolayer onto the surface of the electrode substrate. Further work in progress addresses questions of the preservation of the effect of this surface treatment in thicker CP films and the nature of the resulting changes in mechanical, electronic, and electrochemical properties of the CP film.
122 citations
TL;DR: In this article, the random copolymer poly(2-vinylpyridine-co-p-aminostyrene) was used as a steric stabilizer.
Abstract: Colloidal polyaniline has been prepared in acidic aqueous media by chemical grafting of polyaniline onto a tailor-made polymeric surfactant. The surfactant, which acts as a steric stabilizer, used in this study is the random copolymer poly(2-vinylpyridine-co-p-aminostyrene). This surfactant contains pendant aniline units which participate in the aniline polymerization, resulting in the formation of sterically stabilized polyaniline particles which have a nonspherical «rice grain» morphology
110 citations
TL;DR: In this article, a modified chemical polymerization of aniline in the presence of a tailor-made polymeric surfactant is used as a steric stabilizer, resulting in the formation of sterically-stabilized polyaniline particles which have a non-spherical "rice-grain" morphology.
Abstract: Colloidal polyaniline has been prepared in acidic aqueous media by a modified chemical polymerization of aniline in the presence of a tailor-made polymeric surfactant. The surfactant which acts as a steric stabilizer used in this study is derivatized poly(vinyl alcohol-co-vinyl acetate). This surfactant contains pendant aniline units which participate in the aniline polymerization, resulting in the formation of sterically-stabilized polyaniline particles which have a non-spherical “rice-grain” morphology. It is shown that this novel form of polyaniline is more processable than the bulk powder that is normally obtained from a conventional chemical synthesis. The solid-state conductivity of solution-cast films or compressed pellets of these dispersions is surprisingly high (≃1 S/cm), despite the presence of the insulating outer layer of chemically-grafted stabilizer. We have characterized these polyaniline colloids by a wide range of techniques including electron microscopy, cyclic voltammetry and ...
52 citations
Patent•
05 Jun 1990
TL;DR: In this article, a self-assembling polyaniline is formed on a gold electrode surface with an intermediate monolayer of p-aminothiophenol, and the conducting polymer is then conventioonally deposited by electrochemical deposition.
Abstract: A conducting polymer film with an improved space filling is formed on a metal electrode surface. A self-assembling monolayer is formed directly on the metal surface where the monolayer has a first functional group that binds to the metal surface and a second chemical group that forms a chemical bonding site for molecules forming the conducting polymer. The conducting polymer is then conventioonally deposited by electrochemical deposition. In one example, a conducting film of polyaniline is formed on a gold electrode surface with an intermediate monolayer of p-aminothiophenol.
36 citations
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21 citations
TL;DR: In this paper, a collaborative effort of a team which formed at Los Alamos to investigate the announcement that cold fusion may be occurring in electrochemical cells using palladium cathodes and platinum anodes in a LiOD electrolyte was reported.
Abstract: This paper reports a collaborative effort of a team which formed at Los Alamos to investigate the announcement that “cold fusion” may be occurring in electrochemical cells using palladium cathodes and platinum anodes in a LiOD electrolyte. Four electrochemical cells were construced and operated for 3–5 weeks under various geometrical and electrical conditions. Nuclear diagnostic measurements included high and low resolution gamma-ray spectroscopy, integral neutron counting with well detectors and banks of3He tubes, and neutron spectroscopy withNE-213 scintillators. For one of the cells, the deuterium loading of the cathode was determined from resistance measurements to beD/Pd⩽ 0.8. No conclusive evidence was found for the production of neutrons or 2.223-MeV gammas above levels consistent with background. The results of the measurements of tritium levels in the cell electrolytes are also reported. Experiments to reproduce the observation of neutrons from high pressureTi-D2 gas experiments were also performed with negative results.
3 citations