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Tuning fluidic resistance via liquid crystal microfluidics.

Anupam Sengupta1

  • 1Max Planck Institute for Dynamics and Self Organization (MPIDS), Am Faßberg 17, 37077 Göttingen, Germany. anupam.sengupta@ds.mpg.de.

International Journal of Molecular Sciences
|November 22, 2013
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Summary

This study demonstrates tunable fluidic resistance in microfluidic devices using liquid crystals. Researchers achieved passive and active flow control by manipulating molecular orientation, enabling complex fluidic circuits without physical channel modifications.

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Area of Science:

  • Fluid dynamics
  • Materials science
  • Microfluidics

Background:

  • Flow in molecularly ordered fluids, like liquid crystals, is coupled with molecular orientation (director).
  • This anisotropic coupling offers unique functionalities absent in isotropic fluids.

Purpose of the Study:

  • To harness molecular anisotropy for patterning tunable fluidic resistance in microfluidic devices.
  • To demonstrate passive and active modulation of flow resistance using liquid crystals.

Main Methods:

  • Utilizing a nematic liquid crystalline material flowing in microchannels.
  • Implementing surface anchoring conditions for passive resistance modulation.
  • Employing external fields, such as temperature, for active resistance modulation.

Main Results:

  • Demonstrated passive modulation of fluidic resistance through surface anchoring.
  • Showcased active modulation of flow resistance using external fields.
  • Successfully fabricated basic fluidic circuits with tunable resistance.

Conclusions:

  • The concept allows for the creation of complex fluidic circuits by extending basic designs.
  • No additional design or morphological patterning of microchannels is required.
  • Anisotropy in liquid crystal flow provides a versatile platform for microfluidic control.