Small-angle neutron scattering was employed to study the effect of shear flow on the nematic (N) and lamellar (L(alpha)) phases in aqueous solutions of cesium perfluoro-octanoate. Shear rates as high as similar to 4000 s(-1) were used. The N phase was found to align with the director in the direction of the gradient velocity. The L, 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 at. Subtle shear-rate-dependent director reorientations were also observed in the proximity of the N-to-L(alpha) phase transition.
Copright 1994 Institute of Physics. Available on publisher's website at http://dx.doi.org/10.1209/0295-5075/28/7/006.
Mang, Joseph T.; Kumar, Satyendra; Hammouda, Boualem (1994). Discotic Micellar Nematic and Lamellar Phases Under Shear-Flow. Europhysics Letters 28(7) 489-494. doi: 10.1209/0295-5075/28/7/006. Retrieved from https://oaks.kent.edu/phypubs/26