Entropy-driven enhanced self-diffusion in confined reentrant supernematics

Details Entropy-driven enhanced self-diffusion in confined reentrant supernematics Entropy-driven enhanced self-diffusion in confined reentrant supernematics

2010-10-31

arxiv.org/abs/1011.0147v1

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 5 figures

Scientific paper

We present a molecular dynamics study of reentrant nematic phases using the Gay-Berne-Kihara model of a liquid crystal in nanoconfinement. At densities above those characteristic of smectic A phases, reentrant nematic phases form that are characterized by a large value of the nematic order parameter $S\simeq1$. Along the nematic director these "supernematic" phases exhibit a remarkably high self-diffusivity which exceeds that for ordinary, lower-density nematic phases by an order of magnitude. Enhancement of self-diffusivity is attributed to a decrease of rotational configurational entropy in confinement. Recent developments in the pulsed field gradient NMR technique are shown to provide favorable conditions for an experimental confirmation of our simulations.

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