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Director Reorientation in a Cell with Time-Dependent Anchoring Due To Adsorption/Desorption of LC Molecules

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.