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Determination of the rotational viscosity from the director pattern relaxation in twisted nematic cells

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1 Author(s)
Leenhouts, F. ; Central Research Units, F. Hoffmann‐La Roche & Co. Ltd., CH‐4002 Basel, Switzerland

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The rotational viscosity γ1 is an essential physical quantity directly related to the response times of liquid crystals. We have developed a new method to determine γ1 which utilizes the capacitive detection of the director pattern relaxation in a twisted nematic cell upon switching off the applied voltage of the twisted nematic liquid‐crystal display. Measurements have been performed on two liquid‐crystal mixtures. The agreement between the results obtained with the new method and those obtained from a magnetic field‐induced nematic deformation method is quite satisfactory.

Published in:

Journal of Applied Physics  (Volume:58 ,  Issue: 6 )

Date of Publication:

Sep 1985

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