Abstract
A nematic liquid crystal in cylindrical pores of polycarbonate (Nuclepore) membranes with radii 25– 400 nm was studied by dynamic light scattering. The fundamental mode of the orientational fluctuations shows a crossover from bulk behavior, dominated by bulk-elastic constant K , to a surface-dominated one, in which the relaxation rate is determined by the ratio of surface-anchoring strength W and viscosity h. In the smallest pores, the contribution of surface viscosity z is also significant. The surface extrapolation length KyW goes approximately as sT 2 TNI d21. The characteristic length for surface viscosity zyh is of the order of 10 nm. [S0031-9007(98)08013-2]
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