Dielectric spectroscopy of liquid crystalline dispersions

Document Type

Article

Publication Date

3-14-2006

Abstract

We describe dielectric spectroscopy measurements on dispersions of two thermotropic liquid crystals (5CB and 8CB) in a poly(dimethylsiloxane) matrix. 5CB exhibits nematic and Isotropic phases, while 8CB exhibits smectic, nematic, and Isotropic phases. The spectra of the dispersions exhibit a temperature-dependent dielectric relaxation in the interval from 100 to 1000 Hz, with relaxation times that depend strongly on whether the dispersed phase is Isotropic, nematic, or smectic. The dielectric relaxation times also depend on the viscosity of the matrix fluid. These results suggest a coupling between the electric field and the mechanics of the interface that affects the spectrum of the dispersed phase and shifts the Maxwell-Wagner interfacial polarization peak. © 2006 American Chemical Society.

Identifier

33645515282 (Scopus)

Publication Title

Langmuir

External Full Text Location

https://doi.org/10.1021/la053489o

ISSN

07437463

First Page

2528

Last Page

2533

Issue

6

Volume

22

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