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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Surface-aligning field in smectic liquid-crystal films.

LiDong Pan¹, C C Huang

¹School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|December 21, 2011

Summary

This summary is machine-generated.

Surface effects reduce twisting power in helical smectic-C*(α) liquid crystal films. A strong surface field, identified through J(1)-J(2) models, explains this phenomenon by altering interlayer interactions.

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Area of Science:

Condensed Matter Physics
Liquid Crystal Physics

Background:

Helical smectic-C*(α) phases exhibit unique chiral properties.
Free-standing liquid crystal films show reduced twisting power at surfaces.

Purpose of the Study:

To investigate the cause of reduced twisting power in the surface region of helical smectic-C*(α) liquid crystal films.
To quantitatively study interlayer interactions influenced by surface effects.

Main Methods:

Utilized two modified mean-field J(1)-J(2) models.
Calculated surface interlayer interaction profiles from experimental data.

Main Results:

Identified a strong surface field present in the liquid crystal films.
Correlated the strong surface field with the observed reduction in twisting power near the surface.

Conclusions:

The strong surface field is the primary reason for reduced twisting power in the surface region.
Interlayer interactions in smectic liquid crystals are significantly influenced by surface effects.