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

Marco G Mazza1, Manuel Greschek, Rustem Valiullin

  • 1Stranski-Laboratorium für Physikalische und Theoretische Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany.

Physical Review Letters
|January 15, 2011
PubMed
Summary

We discovered unique "supernematic" liquid crystal phases in nanoconfinement. These phases exhibit extremely high self-diffusivity, offering potential for new material applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Liquid crystals exhibit diverse mesophases, including nematic and smectic phases.
  • Nanoconfinement significantly alters the phase behavior and properties of liquid crystals.
  • Reentrant phase transitions are complex phenomena observed in certain liquid crystal systems.

Purpose of the Study:

  • To investigate the formation and properties of reentrant nematic phases in nanoconfined liquid crystals.
  • To explore the self-diffusivity characteristics of these unique phases.
  • To assess the feasibility of experimental verification using advanced NMR techniques.

Main Methods:

  • Molecular dynamics simulations utilizing the Gay-Berne-Kihara model.
  • Analysis of liquid crystal behavior under nanoconfinement conditions.
  • Calculation of nematic order parameter (S) and self-diffusivity.

Main Results:

  • Formation of reentrant nematic phases at densities exceeding smectic A phases.
  • Observation of a high nematic order parameter (S≃1) in these "supernematic" phases.
  • An order of magnitude increase in self-diffusivity along the nematic director compared to lower-density nematic phases.

Conclusions:

  • Enhanced self-diffusivity in reentrant nematic phases is linked to reduced rotational configurational entropy due to confinement.
  • The findings suggest that pulsed field gradient NMR can experimentally validate these simulated "supernematic" liquid crystal behaviors.