ROLE OF THE PERMANENT QUADRUPOLE-MOMENT OF A DISPERSED PARTICLE IN ELECTROORIENTATION

The electroorientation effect of the second order on the field is not exhausted by the interaction of the field with the induced dipole moment of the particle. An alternative is the interaction of the equilibrium quadrupole moment of the particle with a polarization electric field, which in the second approximation on the field E has a quadrupole symmetry with respect to the direction of E and the center of the particle. The traditional component of electroorientation is missing in the isopolarization state (when the dipole moment of the particle is equal to zero). The alternative component, which we have detected and investigated, is missing in the isoelectric state (when the surface of the particle at equilibrium is not charged). The ratio of the new and the known effects has been investigated for a spheroid in the limiting case of a thick (in comparison with the linear dimensions of the particle) electrical double layer at the interface between the phases for a large number of parameters of the dispersed system.