Viscoelastic behaviour of the SmC phase

Using a light scattering technique at a fixed temperature, we have investigated viscoelastic behaviour exhibited by the ferroelectric smectic phase (SmC*) of C 8 tolane in a homeotropic orientation. Experiments were performed in backward and forward scattering geometries that allowed us to deduce se...

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Bibliographic Details
Published in:Liquid crystals 2005-05, Vol.32 (5), p.579-584
Main Authors: Hammami, Z., Othman, T., Gharbi, A., Nguyen, H. T.
Format: Article
Language:English
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Summary:Using a light scattering technique at a fixed temperature, we have investigated viscoelastic behaviour exhibited by the ferroelectric smectic phase (SmC*) of C 8 tolane in a homeotropic orientation. Experiments were performed in backward and forward scattering geometries that allowed us to deduce separately orientational diffusivities k 3 /η and k + /η corresponding to the Goldstone mode. The k 3 /η value measured in the SmC* phase is about 100 times higher than in the SmC A * phase exhibited by the same liquid crystal compound. The factor 100 may be attributed in great part to the molecular arrangement mode in adjacent smectic layers. However k + /η measured in the SmC* phase is in the same order of magnitude as those measured previously in SmC A * phases.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678290500115823