COLL 369 |
| Vladimir N. Shilov, Macrokinetic of the Disperse System, Macrokinetic of the Disperse System, Institute of Biocolloid Chemistry, Ukrainian Academy of Sciences, Kiev, Ukraine, 42 Vernadskogo, Kiev, 03142, Ukraine |
| Alpha-dispersion of electrooptic effect is caused by concentration polarization of the double layers of colloid particles, and its theoretical description requires the solution of non-stationary diffusion equations. Since these equations do not separate in spheroidal coordinates no theoretical results exist for suspensions of spheroid-shaped particles. We sidestepped this problem by relating the characteristics of a stationary particle's polarization with the characteristic time of low-frequency relaxation of the induced dipole moment. The relations were derived from the comparison of two expressions for suspension dielectric permittivity: one obtained from the summation of dipole fields and the other from the integration of the density of stored energy. Application of this method permits analytical calculation of the low-frequency dependence of the anisotropy of induced dipole moment, controlled by the volume diffusion of ions in the vicinity of charged spheroids with arbitrary axial ratio and with arbitrary magnitude of the surface conductivity. |
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Colloidal and Molecular Electro-Optics
Division of Colloid and Surface Chemistry |