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Related Experiment Video

Updated: Apr 15, 2026

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Liquid Crystal Foams Generated by Pressure-Driven Microfluidic Devices.

Shuojia Shi1, Hiroshi Yokoyama1

  • 1Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 31, 2015
PubMed
Summary
This summary is machine-generated.

Researchers created stable liquid crystal foams using a microfluidic device. Bubbles injected into the nematic phase and cooled to the smectic phase yielded high-quality foams without surfactants.

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Microfluidics

Background:

  • Thermotropic liquid crystals exhibit inherent foaming capabilities due to their anisotropic molecular structures.
  • Traditional foam fabrication often relies on surfactants, which can complicate material properties and applications.

Purpose of the Study:

  • To develop a surfactant-free method for fabricating stable liquid crystal foams.
  • To investigate the controlled injection of uniform gas bubbles into liquid crystals using microfluidics.

Main Methods:

  • Utilized a T-junction microfluidic device for gas bubble injection into liquid crystals.
  • Investigated bubble formation and stability in both nematic and smectic liquid crystal phases.
  • Controlled bubble size and injection rate via microfluidic channel dimensions and flow rates.

Main Results:

  • Achieved stable injection of uniform air bubbles (tens of micrometers) with low polydispersity (<4%) at rates up to 110 Hz.
  • Demonstrated that bubble size is primarily dictated by microfluidic channel dimensions, independent of the liquid crystal phase.
  • Identified an efficient fabrication route: injecting bubbles in the nematic phase and rapidly cooling to the smectic phase.

Conclusions:

  • Microfluidic-assisted bubble injection offers a precise method for creating surfactant-free liquid crystal foams.
  • The nematic-to-smectic phase transition is a key step for achieving stable, high-density liquid crystal foams.
  • This technique holds potential for advanced materials with tailored foam structures.