Phase chirality and stereo-selective swelling of cholesteric elastomers

Details Phase chirality and stereo-selective swelling of cholesteric elastomers Phase chirality and stereo-selective swelling of cholesteric elastomers

2003-09-09

arxiv.org/abs/cond-mat/0309215v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

Cholesteric elastomers possess a macroscopic ``phase chirality'' as the director n rotates in a helical fashion along an optical axis $z$ and can be described by a chiral order parameter. This parameter can be tuned by changing the helix pitch p and/or the elastic properties of the network. The cholesterics also possess a local nematic order, changing with temperature or during solvent swelling. In this paper, by measuring the power of optical rotation, we discover how these two parameters vary as functions of temperature or solvent adsorbed by the network. The main result is a finding of pronounced stereo-selectivity of cholesteric elastomers, demonstrating itself in the retention of the ``correct'' chirality component of a racemic solvent. It has been possible to quantify the amount of such stereo-separation, as the basic dynamics of the effect.

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