Materiály kombinující vodivé polymery a drahé kovy
Polyaniline-silver composites combine the electrical properties of metals and the material properties of polymers. Polyaniline is one of the most studied conducting polymers on account of high electrical conductivity (units S cm-1 ), environmental stability, ease of preparation from common chemicals...
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ndltd-nusl.cz-oai-invenio.nusl.cz-3292642019-05-18T03:26:10Z Materiály kombinující vodivé polymery a drahé kovy Materials combining conducting polymers and noble metals Bober, Patrycja Magdalena Stejskal, Jaroslav Omastová, Mária Pron, Adam Polyaniline-silver composites combine the electrical properties of metals and the material properties of polymers. Polyaniline is one of the most studied conducting polymers on account of high electrical conductivity (units S cm-1 ), environmental stability, ease of preparation from common chemicals, good processibility and low cost. Silver is well known because of its highest conductivity among metals (500 000 S cm−1 ), antibacterial properties, and low price compared to other noble metals. Aniline was oxidized with silver nitrate in acidic aqueous medium to polyaniline-silver composite. The presence of different organic acids was studied. The most promising became methanesulfonic acid solution, in which most problems (such as inhomogeneity of samples and limited solubility of silver salts) got solved. The oxidation of aniline with silver nitrate is slow and takes over several months to get a reasonable yield. An addition of a small amount of p-phenylenediamine, even 1 mol. % relative to aniline, shortens the reaction time to several hours or even to tens of minutes. Small amounts of ammonium peroxydisulfate had similar effect. The content of silver in composites is fixed by the stoichiometry of reaction, and composites always contain ≈70 wt.% of silver. By using mixed oxidants, silver nitrate and... 2013 info:eu-repo/semantics/doctoralThesis http://www.nusl.cz/ntk/nusl-329264 eng info:eu-repo/semantics/restrictedAccess |
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English |
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Doctoral Thesis |
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Polyaniline-silver composites combine the electrical properties of metals and the material properties of polymers. Polyaniline is one of the most studied conducting polymers on account of high electrical conductivity (units S cm-1 ), environmental stability, ease of preparation from common chemicals, good processibility and low cost. Silver is well known because of its highest conductivity among metals (500 000 S cm−1 ), antibacterial properties, and low price compared to other noble metals. Aniline was oxidized with silver nitrate in acidic aqueous medium to polyaniline-silver composite. The presence of different organic acids was studied. The most promising became methanesulfonic acid solution, in which most problems (such as inhomogeneity of samples and limited solubility of silver salts) got solved. The oxidation of aniline with silver nitrate is slow and takes over several months to get a reasonable yield. An addition of a small amount of p-phenylenediamine, even 1 mol. % relative to aniline, shortens the reaction time to several hours or even to tens of minutes. Small amounts of ammonium peroxydisulfate had similar effect. The content of silver in composites is fixed by the stoichiometry of reaction, and composites always contain ≈70 wt.% of silver. By using mixed oxidants, silver nitrate and... |
author2 |
Stejskal, Jaroslav |
author_facet |
Stejskal, Jaroslav Bober, Patrycja Magdalena |
author |
Bober, Patrycja Magdalena |
spellingShingle |
Bober, Patrycja Magdalena Materiály kombinující vodivé polymery a drahé kovy |
author_sort |
Bober, Patrycja Magdalena |
title |
Materiály kombinující vodivé polymery a drahé kovy |
title_short |
Materiály kombinující vodivé polymery a drahé kovy |
title_full |
Materiály kombinující vodivé polymery a drahé kovy |
title_fullStr |
Materiály kombinující vodivé polymery a drahé kovy |
title_full_unstemmed |
Materiály kombinující vodivé polymery a drahé kovy |
title_sort |
materiály kombinující vodivé polymery a drahé kovy |
publishDate |
2013 |
url |
http://www.nusl.cz/ntk/nusl-329264 |
work_keys_str_mv |
AT boberpatrycjamagdalena materialykombinujicivodivepolymeryadrahekovy AT boberpatrycjamagdalena materialscombiningconductingpolymersandnoblemetals |
_version_ |
1719190783342411776 |