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Comparative x-ray and dielectric measurements of smectic A-smectic-C* transition in bulk and confined geometries



Comparative x-ray and dielectric measurements of smectic A-smectic-C* transition in bulk and confined geometries



Physical Review. E Statistical Nonlinear and Soft Matter Physics 66(3 Pt 1): 031710



Comparative x-ray and dielectric measurements have been made on a liquid crystal exhibiting a smectic-A-chiral-smectic-C (smectic-C*) transition in bulk and confined geometries. It is observed that confining the material in Anopore membranes having 200-nm pore size leads to the following features: (1) the temperature dependence of the x-ray layer spacing shows a qualitatively different behavior, (2) in the smectic-A phase the soft mode relaxation frequency increases by a factor of 2.5, and (3) in the smectic-C* phase the relaxation frequency of the Goldstone mode increases dramatically by as much as 400 times, perhaps owing to a partial unwinding of the helix by the surface induced field.

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Accession: 045586815

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PMID: 12366139

DOI: 10.1103/physreve.66.031710


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