Abstract
The effect of surfaces on the relaxation from the homeotropic state to the planar state of cholesteric liquid crystals is investigated. By using an optical retro-reflection technique, the orientation and pitch of cholesteric helices as a function of time have been isolated for various surface treatments. It is found that the pitch relaxes to its minimum value in a matter of milliseconds, independent of surface treatment. Secondary pitch relaxations take place after this. The time dependence of the angular distribution of helical axes is also found to be complex, operating on several time scales.
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