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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Nematic liquid crystalline elastomers are aeolotropic materials.

L Angela Mihai1, Haoran Wang2, Johann Guilleminot3

  • 1School of Mathematics, Cardiff University, Senghennydd Road, Cardiff CF24 4AG, UK.

Proceedings. Mathematical, Physical, and Engineering Sciences
|February 14, 2022
PubMed
Summary

Liquid crystal elastomers exhibit anisotropic responses not predicted by ideal models. Incorporating nematic order effects into continuum models improves theoretical predictions of their elastic behavior.

Keywords:
anisotropyelastic modulielastomersfinite deformationliquid crystalsmolecular dynamics simulations

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Continuum Mechanics

Background:

  • Continuum models for ideal nematic solids are standard for liquid crystal elastomers.
  • Experimental data reveals anisotropic responses unpredicted by ideal models, necessitating new theoretical approaches.
  • Aeolotropic effects in nematic elastomers require additional coupling terms between elastic and nematic responses.

Purpose of the Study:

  • To analyze theoretically and computationally the elastic response of nematic elastomers under various deformations.
  • To compare elastic moduli from molecular dynamics simulations with theoretical predictions.
  • To investigate the necessity of including nematic order effects in continuum frameworks for accurate modeling.

Main Methods:

  • Theoretical analysis of stretch and shear deformations.
  • Computational molecular dynamics simulations.
  • Comparison of infinitesimal elastic strain limit moduli.

Main Results:

  • Discrepancies between ideal models and experimental observations of nematic elastomer response.
  • Molecular dynamics simulations provide data for elastic moduli.
  • Theoretical models enhanced with nematic order effects show improved agreement with simulation results.

Conclusions:

  • Ideal continuum models are insufficient for describing the full elastic response of nematic elastomers.
  • Including nematic order effects within the continuum framework is crucial for accurately predicting aeolotropic behavior.
  • The study validates the enhanced continuum approach through comparison with molecular dynamics simulations.