Structure of smectic defect cores: an X-ray study of 8CB liquid crystal ultra-thin films

Abstract : We study the structure of very thin liquid crystal films frustrated by antagonistic anchorings in the smectic phase. In a cylindrical geometry, the structure is dominated by the defects for film thicknesses smaller than 150 nm and the detailed topology of the defects cores can be revealed by x-ray diffraction. They appear to be split in half tube-shaped Rotating Grain Boundaries (RGB). We determine the RGB spatial extension and evaluate its energy per unit line. Both are significantly larger than the ones usually proposed in the literature
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Contributor : Emmanuelle Lacaze <>
Submitted on : Wednesday, October 26, 2005 - 4:39:29 PM
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Jean-Philippe Michel, Emmanuelle Lacaze, M. Goldmann, Marc Gailhanou, Marc de Boissieu, et al.. Structure of smectic defect cores: an X-ray study of 8CB liquid crystal ultra-thin films. Physical Review Letters, American Physical Society, 2006, 96 (2), pp.027803. ⟨10.1103/PhysRevLett.96.027803⟩. ⟨hal-00012699⟩

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