Behavior of a Deionized Liquid Crystal Subjected to Unipolar Injection in Nematic and Isotropic Phase

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Abstract
Electrohydrodynamic phenomena in insulating MBBA subjected to unipolar injection of ionic carriers are described. Near the transition temperature, the transient currents following a voltage step were similar in the nematic and isotropic phases, over a wide range of voltages and electrode separations. High‐speed cinematography, Schlieren techniques, and the Kerr effect were resorted to in this investigation. Liquid motion was observed having a time lag and exhibited patterns closely similar to those previously observed in isotropic polar liquids. The velocities of hydrodynamic disturbances and of space‐charge fronts varied over a broad range, depending on experimental conditions.

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