K. Asami, DIELECTRIC ANALYSIS OF POLYSTYRENE MICROCAPSULES USING SCANNING DIELECTRIC MICROSCOPE, Colloid and polymer science, 276(4), 1998, pp. 373-378
A dielectric imaging technique with a scanning dielectric microscope w
as applied to polystyrene microcapsules in an aqueous environment to s
tudy the electrical properties of individual ones. The dielectric imag
es obtained over a frequency range from 10 kHz to 10 MHz showed freque
ncy dependence, which indicated dielectric dispersion (or relaxation)
due to interfacial polarization or the build between the microcapsule
shell and the aqueous phases. The dielectric dispersion was analyzed b
ased on an equivalent electrical circuit model and a shell-sphere mode
l in which a spherical core is covered with an insulating shell.