The bulk viscosity of two cholesteric mixed systems cholesteryl nonanoate/cholesteryl chloride and CB 15/ZLI 1612 has been measured using Ubbelohde capillary viscometers. A viscosity maximum close below the clearing point only has been observed in such mixtures exhibiting blue phases (BP). Cholesteric systems with larger pitches in which no BPs exist show a nematic-like capillary flow behaviour.
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Stegemeyer et al. (1982) studied this question.
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