Title: Studies of the temperature-pitch variations in planar cholesteric layers and surface anchoring
Authors: Zink, Johannes ×
Belyakov, VA #
Issue Date: 1999
Series Title: Molecular crystals and liquid crystals science and technology Section A: Molecular crystals and liquid crystals vol:329 Part 2 pages:1069-1076
Abstract: Analysis of the temperature dependence of the measured optical characteristics of planar oriented cholesteric (CLC) layers shows that just before the change of the number of half-pitches within the layer thickness by one, the director direction at the surface essentially differs from the alignment direction and the jump temperature is dependent on the direction of the temperature change (cooling or heating). A theoretical description of this hysteresis is presented on the basis of a continuum theory of elasticity of CLC's that takes also account of the surface anchoring. Because the observed hysteresis and deviation angle are dependent on the molecular anchoring forces at the surface the corresponding measurements fitted to the developed theory are used to obtain information about the anchoring potential. The possible ways of the, model independent, anchoring potential reconstruction and the different jump mechanisms are discussed
ISSN: 1058-725X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
× corresponding author
# (joint) last author

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