Abstract:
An electro-optical technique for studying colloids and suspensions with particles of a wide range of sizes is considered. This technique can be used to study the formation of aggregates in liquid disperse systems, as well as the electrical polarizability of particles, which depends on the electrical and adsorption characteristics of their surface. Relationships were obtained that allow to distinguish two electro-optical effects from the observed change in the dependences of light intensity caused by the external electric field. One effect is determined by the polarization of incident light – dichroism. The other effect is not related to the polarization of light. Experimental studies of aqueous colloids of diamond and graphite confirmed the applicability of the obtained relationships used to determine the electric field-induced dichroism of colloids and the electro-optical effect independently of light polarization. It is shown that the polarization-independent effect is not observed in systems with small particles, but as the particle size increases, this second effect becomes comparable to dichroism.
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