Stereo-selective swelling of imprinted cholesteric networks

Details Stereo-selective swelling of imprinted cholesteric networks Stereo-selective swelling of imprinted cholesteric networks

2003-09-09

arxiv.org/abs/cond-mat/0309214v1

Phys. Rev. Lett. v..91, 085503 (2003)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.91.085503

Molecular chirality, and the chiral symmetry breaking of resulting macroscopic phases, can be topologically imprinted and manipulated by crosslinking and swelling of polymer networks. We present a new experimental approach to stereo-specific separation of chiral isomers by using a cholesteric elastomer in which a helical director distribution has been topological imprinted by crosslinking. This makes the material unusual in that is has a strong phase chirality, but no molecular chirality at all; we study the nature and parameters controlling the twist-untwist transition. Adding a racemic mixture to the imprinted network results in selective swelling by only the component of ``correct'' handedness. We investigate the capacity of demixing in a racemic environment, which depends on network parameters and the underlying nematic order.

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