Dielectric analysis of polystyrene microcapsules using scanning dielectric microscope |
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Authors: | K Asami |
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Institution: | (1) Institute for Chemical Research Kyoto University Uji, Kyoto 611 Japan E-mail: asami@tampopo.kuicr.kyoto-u.ac.jp, JP |
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Abstract: | A dielectric imaging technique with a scanning dielectric microscope was applied to polystyrene microcapsules in an aqueous
environment to study the electrical properties of individual ones. The dielectric images obtained over a frequency range from
10 kHz to 10 MHz showed frequency dependence, which indicated dielectric dispersion (or relaxation) due to interfacial polarization
or the build up of charge on the boundaries between the microcapsule shell and the aqueous phases. The dielectric dispersion
was analyzed based on an equivalent electrical circuit model and a shell-sphere model in which a spherical core is covered
with an insulating shell.
Received: 26 September 1997 Accepted: 26 December 1997 |
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Keywords: | Dielectric dispersion polystyrene microcapsule scanning dielectric microscope interfacial polarization dielectric imaging |
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