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

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Bahr,  Christian
Group Structure formation in soft matter, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Sandhya, K. L., Prasad, S. K., Rao, D. S. S., & Bahr, C. (2002). Comparative x-ray and dielectric measurements of smectic A - smectic-C* transition in bulk and confined geometries. Physical Review E, 66(3): 031710. doi:10.1103/PhysRevE.66.031710.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-B64D-B
Abstract
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.