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Differential rotation in cholesteric pillars under a temperature gradient.

Jun Yoshioka1,2, Fumito Araoka3

  • 1RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan. j-yoshi@fc.ritsumei.ac.jp.

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|October 15, 2020
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Summary
This summary is machine-generated.

Cholesteric droplets exhibit a novel differential rotation under temperature gradients, driven by internal fluid flow. This discovery reveals a new rotational mode in these liquid crystal systems.

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Area of Science:

  • Physics
  • Materials Science
  • Fluid Dynamics

Background:

  • Cholesteric droplets typically show collective or rigid-body rotation under thermal gradients.
  • Previous studies focused on bulk rotation, not spatially varying angular velocity within droplets.

Purpose of the Study:

  • To identify and characterize a new rotational mode in cholesteric droplets under a temperature gradient.
  • To investigate the underlying fluid dynamics and director motion responsible for this phenomenon.

Main Methods:

  • Experimental observation of pillar-shaped cholesteric droplets confined between substrates.
  • Detailed analysis of the internal flow field using microscopy and fluid dynamics principles.

Main Results:

  • A novel differential rotation mode was observed, where angular velocity varies radially within the droplet.
  • A double convection roll was identified within the cholesteric pillars under a temperature gradient.
  • Inhomogeneous material flow, driven by the temperature gradient, was found to induce this differential rotation.

Conclusions:

  • The observed differential rotation in cholesteric pillars is driven by temperature-gradient-induced inhomogeneous flow.
  • The coupling between fluid flow and director motion is crucial for understanding rotation in cholesteric droplets under thermal gradients.