Small-angle neutron scattering was employed to study the effect of shear flow on the nematic (N) and lamellar (L α ) phases in aqueous solutions of cesium perfluoro-octanoate. Shear rates as high as ∼ 4000 s -1 were used. The N phase was found to align with the director in the direction of the gradient velocity. The L α phase oriented with lamellae parallel to the shear plane. This change in equilibrium orientation is attributed, primarily, to changes in the value of the Ericksen viscosity parameter α 2 . Subtle shear-rate-dependent director reorientations were also observed in the proximity of the N-to-L α phase transition.
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Mang et al. (1994) studied this question.
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