Abstract
The phase behavior and bistable effect of the induced smectic phase by mixing 4-Cyano-4′-pentyloxy biphenyl (5OCB) and 4-hexyloxy phenyl-4′-pentyl benzoate (HPPB) low-molecular-weight nematic liquid crystals have been studied. The 5OCB nematic crystal with a strong polar terminal group was miscible with the HPPB nematic crystal having a weak polar terminal group. The binary mixture showed an induced smectic phase over a wide range of concentrations and temperatures. Reversible transparent-opaque (light scattering) switching was observed upon the application of electric fields with low and high frequencies, respectively. Both the transparent and opaque states of the mixture could be maintained stably, even after the electric field was turned off (memory effect). A novel-type electrooptical effect based on light scattering was observed for the mixture in the induced smectic state.
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