Abstract
Polyaniline (PANI) nanoparticles were chemically synthesized in the presence of a cross-linked carboxymethyl chitin (CM-chitin) acting as a template. The reaction was performed under acidic conditions and the template was removed after the polymerization of aniline was completed. The morphology of the synthesized PANI was globular with a diameter in the nanometer range. The degree of cross-linking of the CM-chitin played an important role in determining the size of the obtained PANI nanoparticles, which decreased from approximately 392 to 160 nm with increase in concentration of the cross-linking agent, glutaraldehyde, from 0 to 9 μmol, respectively. At a higher glutaraldehyde concentration (18 μmol), an aggregated PANI network was observed due to the incomplete removal of the more highly cross-linked CM-chitin. Molecular characterization (including UV-Visible, FTIR, TGA, and XRD techniques) revealed that the structure of the synthesized PANI nanoparticles is identical to that of conventional PANI. A mechanism is proposed for the formation of PANI nanoparticles in the presence of the cross-linked CM-chitin template.
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Acknowledgments
The authors gratefully acknowledge Thailand Research Fund (Royal Golden Jubilee Ph.D Scholarship), National Nanotechnology Center (NANOTEC), NSTDA, and The Conductive and Electroactive Polymers Research Unit, Chulalongkorn University, Thailand, for their financial support of this work. AMJ acknowledges The National Science Foundation for financial support through award DMR0513010, Polymers Program. We also acknowledge Surapon Food Public Co. Ltd. for supplying the material for this work.
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Thanpitcha, T., Sirivat, A., Jamieson, A.M. et al. Polyaniline nanoparticles with controlled sizes using a cross-linked carboxymethyl chitin template. J Nanopart Res 11, 1167–1177 (2009). https://doi.org/10.1007/s11051-008-9515-8
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DOI: https://doi.org/10.1007/s11051-008-9515-8