Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 11: POSTER Disperse Polymer Systems
CPP 11.27: Poster
Dienstag, 28. März 2006, 17:00–19:00, P3
Dielectric heating of Inverse miniemulsions:size dependence on the absorption of microwave radiation — •J Tsuwi1, F Kremer1, C Holtze2, M Antonietti3, R Sivaramakrishnan4, and K.D Kramer 4 — 1Institute for Experimental Physics I, University of Leipzig,Linnéstraße 5, 04103, Leipzig,Germany — 2Experimental Soft Condensed Matter Group, 40 Oxford Street, Harvard University,Cambridge, MA 02138, U.S.A — 3Max Planck Institute of Colloids and Interfaces,Department of Colloid Chemistry, D-14424 Potsdam,Germany — 4Department of Physics, Free University of Berlin, Arnimallee, Berlin Dahlem,Germany
The absorption of microwave radiation in aqueous NaCl droplets is analyzed in the frequency range 1MHz to 4GHz.The droplets were dispersed in a continuous oil medium characterized by a dielectric constant of 2.0 and a loss of less than 0.1.All miniemulsions investigated showed one dielectric loss peak, whose intensity and frequency position varied depending on the droplet size.The analysis of data is discussed in the context of Maxwell-Wagner polarization mechanism.The information obtained from this study not only allows the simple adjustment of heating rates (for example in microwave enhanced chemical reactions) by structural control in multiphasic emulsions and dispersions, but also is relevant for the discussion of health impacts in high frequency telecommunication devices.References (1)J.Tsuwi et.al.Dielectric heating of Inverse miniemulsions: size dependence on the absorption of microwave radiation (in preparation)