Viscoelastic behaviour of ferro- and antiferroelectric phases |
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| Authors: | T Othman Corresponding author Z Hammami A Gharbi H T Nguyen |
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| Institution: | 1. Laboratoire de Physique de la Matière Molle , Faculté des Sciences de Tunis , 1060 Bélvèdere, Tunis, Tunisie;2. Centre de Recherche Paul Pascal , Ave. A. Schweitzer, F- 33600 Pessac Cedex, France |
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| Abstract: | We have investigated the viscoelastic behaviour exhibited by chiral smectic C* phases in homeotropic orientation. For an appropriate scattering geometry and using the light scattering technique, the orientational diffusivities associated with the Goldsone mode in ferro- and antiferroelectric phases of C11thiobenzoate and C8tolane compounds have been measured. (SmCA*) is about 100 times weaker than (SmC*). This divergence may be largely attributed to the mode of the molecular arrangement in ferro- and antiferroelectric phases, in spite of the same helical structure observed in the two phases. |
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