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Microchannel geometry effects on nematic dowser domain dynamics.

Tadej Emeršic̆1,2, Rui Zhang3, Simon C̆opar4

  • 1Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA.

Soft Matter
|July 25, 2025
PubMed
Summary
This summary is machine-generated.

Fluid flow in microfluidic channels controls the dynamics of liquid crystal defects, known as dowser domains. Channel geometry dictates domain growth, lifespan, and splitting, enabling new device designs.

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Area of Science:

  • Soft Matter Physics
  • Fluid Dynamics
  • Materials Science

Background:

  • Topological defects in liquid crystals are crucial for applications like adaptive optics and displays.
  • Understanding defect dynamics is key to optimizing liquid crystal device performance.

Purpose of the Study:

  • Investigate the dynamics of dowser domains (disclination loops) in nematic liquid crystals within microfluidic channels.
  • Determine the influence of channel geometry and fluid flow on domain behavior.

Main Methods:

  • Combined experimental studies with numerical simulations.
  • Utilized microfluidic channels with varying geometries (constrictions, expansions, serpentine, T-junction).

Main Results:

  • Fluid flow, governed by channel geometry, dictates dowser domain dynamics, shape, and size.
  • Channel constrictions accelerate growth and extend domain lifetime.
  • Channel expansions slow dynamics and shorten domain lifespan.
  • Serpentine channels and T-junctions allow manipulation of domain shape, lifespan, and splitting.

Conclusions:

  • Channel geometry is a primary factor controlling topological defect dynamics in liquid crystals.
  • Findings enable the design of hierarchical networks for high-throughput manipulation of dowser domains.
  • Advances understanding of defect loop dynamics and flow-based liquid crystal device development.