Abstract
The evolution of the band texture, that develops in a lyotropic chiral nematic (cholesteric) PBDG solution after cessation of flow, is determined by means of a polarizing microscope equipped with a shear-flow cell. Both the real and the conoscopic SALS images are used to obtain information on the increase of the band spacing as a function of relaxation time. Also, a relation betweenthe previously applied shear rate and the lateral band size is observed. The experimental results on the band spacing are compared to a simple one-dimensional (1-D) continuum mechanical model that uses the bend Frank elastic constant and the Miesowicz rotational viscosity
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