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Abstract
13C-NMR measurements of the chiral mesogen cholesteryl-undecylcarbonate (CHUC) adsorbed in Anopore membranes with cylindrical pores of 0.2μm diameter are presented. The pitch of CHUC in the cholesteric phase is of order of the pore diameter, and in view of the planar axial anchoring a strong influence of the walls on the director field can be expected.
Simulation of the angular dependence of 13C-NMR line shape allows to determine a mean tilt angle of 60μ of the director with respect to the helical axes which are oriented along the channels. Furthermore, at T=341K a correlation time of 130μs for reorientational motions could be obtained which is connected with molecular diffusion along the pores. Optical and NMR-measurements are compatible with a tilted helical director field for the cholesteric LC material within the pores.