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  • Title: Electric-field-induced motion of polymer cholesteric liquid-crystal flakes in a moderately conductive fluid.
    Author: Kosc TZ, Marshall KL, Jacobs SD, Lambropoulos JC, Faris SM.
    Journal: Appl Opt; 2002 Sep 01; 41(25):5362-6. PubMed ID: 12211565.
    Abstract:
    Polymer cholesteric liquid-crystal flakes suspended in a fluid with nonnegligible conductivity can exhibit motion in the presence of an ac electric field. The plateletlike particles with a Grandjean texture initially lie parallel to the cell substrates and exhibit a strong selective reflection that is diminished or extinguished as the flakes move. Flake motion was seen within a specific frequency bandwidth in an electric field as low as 5 mV(rms)/microm. Flakes reoriented about their longest axis to align parallel to theapplied field, and a rise time of 560 ms was seen in a 40-mV(rms)/microm field at 100 Hz.
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