Macroscopic torsional strain and induced molecular conformational deracemization |
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Authors: | Basu Rajratan Pendery Joel S Petschek Rolfe G Lemieux Robert P Rosenblatt Charles |
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Institution: | Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106, USA. |
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Abstract: | A macroscopic helical twist is imposed on an achiral nematic liquid crystal by controlling the azimuthal alignment directions at the two substrates. On application of an electric field the director rotates in the substrate plane. This electroclinic effect, which requires the presence of chirality, is strongest at the two substrates and increases with increasing imposed twist distortion. We present a simple model involving a trade-off among bulk elastic energy, surface anchoring energy, and deracemization entropy that suggests the large equilibrium director rotation induces a deracemization of chiral conformations in the molecules-effectively "top-down" chiral induction-quantitatively consistent with experiment. |
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