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Abstract : Electric field effects on crystal shapes of Blue Phases and of the Helicoidal Phase of cholesteric liquid crystals are considered We show that dielectric energy of these phases contributes to the energy βhkl, of steps on hkl facets and finally affects global crystal shapes : 1 facets perpendicular to the helix axis appear on droplets of the Helicoidal Phase, 2 100 facets appear on monocrystals of the Blue Phase II. We point out that shapes and sizes of facets, existing without the field, should be modified by the field.

Mots-clés : cholesteric liquid crystals

Author: P. Pierański P.E. Cladis R. Barbet-Massin

Source: https://hal.archives-ouvertes.fr/


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