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Quincke suspensions

The dynamic equations describing so-called Quincke effect - spontaneous rotation of the dielectric particles in liquids with low conductivity was for the first time proposed in 1982. Later it turned out that these equations after corresponding rescalings are equivalent to the Lorenz equations which are the paradigmatic model of the deterministic chaos phenomena. Onthe basis of these models the phenomenon of the negative effective viscosity effect was predicted. Thus it was shown that the quicke suspension is the particular representative of the active system. On the basis of kinetic equation describing the Dynamics of particle rotation plane orientations their synchronization due to the hydrodynamic interactions was considered. The approach was generalized to the anisotropic particles and new deterministic chaos phenomena were predicted and experimental observation of curious orientation of dielectric rods perpendicularly to the Electric field explained. The developed model allows one to calculate the increase of the conductivity of the suspension due to rotations of dielectric colloidal grains. Developed models were generalized by including thermal noise and interesting bistability phenomena were predicted.

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