Thickness dependent phase behavior of antiferroelectric liquid crystal films

Lidong Pan; Shun Wang; C. S. Hsu; C. C. Huang

doi:10.1103/PhysRevLett.103.187802

Thickness dependent phase behavior of antiferroelectric liquid crystal films

Lidong Pan, Shun Wang, C. S. Hsu, C. C. Huang

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Free standing films of a liquid crystal compound with simple surface enhanced order were studied. The resultant phase diagram demonstrates that (1) the short helical pitch smectic-Cα* phase disappears below a film thickness of 10 layers, and (2)the temperature window of a distorted 4 layer smectic-CFI2* phase increases dramatically upon decreasing film thickness. The experimental findings were attributed to the reduced dimensionality and enhanced surface effects in thin films. The results of the smectic-Cα * phase are consistent with what have been reported for helically ordered magnetic thin films, with a noticeable difference due to the opposite effect of the surface on ordering in the two systems.

Original language	English (US)
Article number	187802
Journal	Physical review letters
Volume	103
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.103.187802
State	Published - Oct 30 2009

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10.1103/PhysRevLett.103.187802

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abstract = "Free standing films of a liquid crystal compound with simple surface enhanced order were studied. The resultant phase diagram demonstrates that (1) the short helical pitch smectic-Cα* phase disappears below a film thickness of 10 layers, and (2)the temperature window of a distorted 4 layer smectic-CFI2* phase increases dramatically upon decreasing film thickness. The experimental findings were attributed to the reduced dimensionality and enhanced surface effects in thin films. The results of the smectic-Cα * phase are consistent with what have been reported for helically ordered magnetic thin films, with a noticeable difference due to the opposite effect of the surface on ordering in the two systems.",

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AB - Free standing films of a liquid crystal compound with simple surface enhanced order were studied. The resultant phase diagram demonstrates that (1) the short helical pitch smectic-Cα* phase disappears below a film thickness of 10 layers, and (2)the temperature window of a distorted 4 layer smectic-CFI2* phase increases dramatically upon decreasing film thickness. The experimental findings were attributed to the reduced dimensionality and enhanced surface effects in thin films. The results of the smectic-Cα * phase are consistent with what have been reported for helically ordered magnetic thin films, with a noticeable difference due to the opposite effect of the surface on ordering in the two systems.

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Thickness dependent phase behavior of antiferroelectric liquid crystal films

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