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Polyaniline-coated silica gel |
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| Authors: | Jaroslav Stejskal,Otakar QuadratIrina Sapurina,Josef ZemekAlicja Drelinkiewicz,Magdalena HasikIvo K?ivka,Jan Proke&scaron |
| Affiliation: | a Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic b Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg 199004, Russia c Institute of Physics, Academy of Sciences of the Czech Republic, 182 21 Prague 8, Czech Republic d Department of Chemistry, Jagiellonian University, 30-060 Kraków, Poland e Department of Materials Science and Ceramics, Academy of Mining and Metallurgy, 30-059 Kraków, Poland f Faculty of Mathematics and Physics, Charles University, 121 16 Prague 2, Czech Republic |
| Abstract: | Silica gel microspheres 7 and 15 μm in diameter were coated with an overlayer of polyaniline camphorsulfonate or hydrochloride during the oxidative polymerization of aniline. Coated silica gel and polyaniline precipitate were separated using a difference in sedimentation rate. In an alternative approach, the microspheres were modified with polyaniline in the presence of 35 nm colloidal silica. This technique prevented the macroscopic precipitation of polyaniline. Coatings of neat, 3-aminopropyl- and octadecyl-modified silica gel with polyaniline hydrochloride were compared. The surface composition of coated microspheres was characterized by X-ray photoelectron spectroscopy. Potential applications of particles in electrorheology, organic catalysis, and in modeling of conductivity behavior in composites are demonstrated. |
| Keywords: | Polyaniline Polyaniline coating Polyaniline film Polyaniline dispersion Conducting polymer Colloidal silica Silica gel Electrorheology Catalysis Conductivity |
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