Abstract
A new technique is described for measuring dielectric dispersion of a single microcapsule in suspension over a frequency range from 1 kHz to 10 MHz. It was applied to polystyrene microcapsules which showed a two-step dielectric dispersion, that is, a superposition of two Debye type dispersions. The dielectric dispersion was analyzed by an electrical model in which a spherical core covered with a shell is immersed in a continuous phase, yielding the phase parameters related to the microcapsule: the wall thickness, the permittivity and conductivity of the core phase. The advantage of this technique is that it can characterize individual microcapsules, whereas the conventional method provides average properties of many microcapsules. Hence, the technique enables us to directly determine the distributions of the phase parameters and to exactly examine the relationship between the dielectric behavior and the microcapsule structure simultaneously observed by microscopy.
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Zhang HZ, Sekine K, Hanai T, Koizumi N (1983) Colloid Polymer Sci 261:381–389
Zhang HZ, Sekine K, Hanai T, Koizumi N (1984) Colloid Polymer Sci 262:513–520
Sekine K (1987) Colloid Polymer Sci 265:1054–1060
Sekine K, Hanai T (1990) Colloid Polymer Sci 268:1059–1065
Sekine K, Hanai T (1991) Colloid Polymer Sci 269:880–888
Asami K, Irimajiri A (1985) Bull Inst Chem Res, Kyoto Univ 63:259–275
Asami K, Irimajiri A (1984) Biochim Biophys Acta 769:370–376
Asami K, Irimajiri A, Hanai T (1987) Bull Inst Chem Res, Kyoto Univ 64:339–343
Asami K, Irimajiri A, Hanai T (1989) Bull Inst Chem Res, Kyoto Univ 67:207–216
Maxwell JC (1891) A Treatise on Electricity and Magnetism. Clarendon Press, Oxford
Wagner KW (1914) Arch Electrotech (Berlin) 2:371–387
Pauly H, Schwan HP (1959) Z Naturforschg 14b:125–131
Hanai T (1968) In: Sherman P (ed) Emulsion Science Academic Press, London, New York, p 353
Tateno A, Shiba M, Kondo T (1978) In: Becher P, Yudenfreund MN (eds) Emulsions, Latices and Dispersions. Marcel Dekker Inc, New York, p 279
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Asami, K., Zhao, K.S. Dielectric measurement of a single sub-millimeter size microcapsule. Colloid Polym Sci 272, 64–71 (1994). https://doi.org/10.1007/BF00653311
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DOI: https://doi.org/10.1007/BF00653311