The birefringence and transparency of a colloidal solution of nanosized magnetite particles in kerosene are studied near the electrode surface. It is revealed that, in a pulsed electric field, changes of electrooptical effects near the electrode surface are of a complex character. Characteristic regions of electrooptical effects in relation to the strength of the field and the time of its action are separated. Based on these electrooptical experiments, the electrophoretic mobility of magnetite colloidal particles is calculated.
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