Landau model for polymer-stabilized ferroelectric liquid crystals: experiment and theory

P. Archer, I. Dierking, M.A. Osipov

Research output: Contribution to journalArticle

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Abstract

The interaction between a phase separated polymer network and a liquid crystal was studied across the smectic-A* (Sm-A*) to smectic-C* (Sm-C*) phase transition of a polymer-stabilized ferroelectric liquid crystal polymerized in the Sm-A* phase. Using precise measurements of the tilt angle and the spontaneous polarization as functions of the external electric field and polymer concentration, the effective coefficients of the Landau expansion of the free energy of the Sm-C* phase have been determined experimentally. The observed polymer concentration dependence of the Landau expansion coefficients is explained using a more general theoretical model which incorporates the effect of polymer networks on the local liquid crystal director configuration. In particular, using experimental estimates of the penetration depth of the polymer network into the liquid crystal, it is shown that the b coefficient calculated from the Landau model increases with polymer concentration, evidencing the relationship determined experimentally.
LanguageEnglish
Pages051703-051703
Number of pages0
JournalPhysical Review E
Volume78
Issue number5
DOIs
Publication statusPublished - Nov 2008

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Liquid Crystal
Polymers
liquid crystals
polymers
Experiment
Model
Coefficient
coefficients
expansion
Tilt
Penetration
Theoretical Model
External Field
Free Energy
Electric Field
Polarization
Phase Transition
penetration
free energy
Angle

Keywords

  • landau model
  • polymer-stabilized ferroelectric liquid crystals
  • Polymer-stabilized liquid crystals

Cite this

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Landau model for polymer-stabilized ferroelectric liquid crystals: experiment and theory. / Archer, P.; Dierking, I.; Osipov, M.A.

In: Physical Review E, Vol. 78, No. 5, 11.2008, p. 051703-051703.

Research output: Contribution to journalArticle

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AU - Dierking, I.

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AB - The interaction between a phase separated polymer network and a liquid crystal was studied across the smectic-A* (Sm-A*) to smectic-C* (Sm-C*) phase transition of a polymer-stabilized ferroelectric liquid crystal polymerized in the Sm-A* phase. Using precise measurements of the tilt angle and the spontaneous polarization as functions of the external electric field and polymer concentration, the effective coefficients of the Landau expansion of the free energy of the Sm-C* phase have been determined experimentally. The observed polymer concentration dependence of the Landau expansion coefficients is explained using a more general theoretical model which incorporates the effect of polymer networks on the local liquid crystal director configuration. In particular, using experimental estimates of the penetration depth of the polymer network into the liquid crystal, it is shown that the b coefficient calculated from the Landau model increases with polymer concentration, evidencing the relationship determined experimentally.

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