Entropy-driven enhanced self-diffusion in confined reentrant supernematics

Mazza, Marco G.; Greschek, Manuel; Valiullin, Rustem; Kärger, Jörg; Schoen, Martin

doi:10.1103/PhysRevLett.105.227802

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Entropy-driven enhanced self-diffusion in confined reentrant supernematics

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Mazza, Marco G.
Group Non-equilibrium soft matter, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Mazza, M. G., Greschek, M., Valiullin, R., Kärger, J., & Schoen, M. (2010). Entropy-driven enhanced self-diffusion in confined reentrant supernematics. Physical Review Letters, 105(22): 227802. doi:10.1103/PhysRevLett.105.227802.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-B453-D

Abstract

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≃1. 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.