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Area of Science:

  • Fluid Dynamics
  • Materials Science
  • Microfluidics

Background:

  • Liquid crystal microfluidics offers programmable flow control.
  • Flow behavior in curved microchannels remains largely unstudied.

Purpose of the Study:

  • To investigate and demonstrate how channel curvature influences liquid crystal (LC) flow.
  • To explore the potential of curvature-mediated control for microfluidic applications.

Main Methods:

  • Experimental studies using U- and L-shaped microchannels with a nematic LC.
  • Numerical simulations to analyze flow and director field dynamics.
  • Polarizing optical microscopy for flow visualization.

Main Results:

  • Channel curvature induces transverse flow-induced director gradients.
  • The director field influences and controls the LC flow.
  • Curvature-mediated control allows programmable amplification or suppression of LC transport.

Conclusions:

  • Microchannel geometry, specifically curvature, is a key factor in programming LC flows.
  • This research introduces concepts for novel LC microfluidic valves.
  • Findings have implications for understanding LC behavior in complex biological systems.