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The time evolution of the director orientation in a nematic cell due to the adsorption=desorption processes of LC molecules on the cell substrate is considered. It is shown that boundary conditions on the cell surface evolve in accordance with the orientation distribution function of LC molecules in the cell bulk. During the time evolution the orientational distribution function of molecules adsorbed on the cell substrate possesses two maximums. Switching off the magnetic field at the suitable moment one can obtain a bistable nematic system.

We have studied the effect of adsorption and desorption of rod-like magnetic grains on the macroscopic properties of ferronematics in a ferronematic cell. An external magnetic field controls the equilibrium between ferroparticles in the bulk and those adsorbed on the cell surfaces. The magnetic field can thus influence the anchoring and the nematic orientational texture. In the presence of ferroparticle adsorption, the segregation effect is diminished, and the system becomes less susceptible to bulk ferroparticle coagulation.