Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: POSTERS Magnetic Soft Matter

CPP 12.13: Poster

Dienstag, 24. März 2009, 14:00–16:30, P3

Locoregional Polymerization from Nano-Object Surfaces: A Kinetic Study — Celin Gürler¹, Alex Bian², and •Annette Schmidt¹ — ¹Institut für Organische Chemie und Makromolekulare Chemie, Heinrich-Heine-Universität, Universitätsstr. 1, 40225 Düsseldorf, Germany — ²Department of Chemistry, University of Calgary, Alberta, Canada

The possibility to activate a chemical reaction locally in a confined environment by selective heating is of great potential and interest for the design of complex nanostructures. Our approach is to use the ability of dipolar nanoparticles to transform electromagnetic energy into thermal energy in order to activate a (surface-initiated) polymerization process predominantly on the particle-medium interface.[1] The particles investigated are cobalt-based nanoparticles, known to undergo heat dissipation by Brownian rotation upon irradiation in an AC field in the kHz range. In our work we directly compare kinetic data obtained by magnetic heating and conventional heating. Both data sets indicate a reaction rate of pseudo first order, while a significant faster conversion is obtained by using magnetic heating when compared to conventional heating at the same bulk temperature. We found significant differences in the architectures of the particles that suggest an impact of the heating mode on the morphology of the resulting materials and a reasonable control on the shell thickness by the field parameters in magnetically heated experiments.