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Continuous fabrication of core-shell aerogel microparticles using microfluidic flows.

Nicholas Teo1, Chenxi Jin1, Akshata Kulkarni1

  • 1Department of Polymer Engineering, The University of Akron, 250 South Forge Street, Akron, OH 44325-0301, United States.

Journal of Colloid and Interface Science
|November 26, 2019
PubMed
Summary

Researchers fabricated core-shell polyimide aerogel microparticles using a microfluidic device and an oil-in-oil-in-oil emulsion system. This method creates stable, porous structures for potential advanced material applications.

Keywords:
AerogelsCore-shellDouble emulsionMicrofluidicsPolyimide

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Aerogels offer unique properties but fabricating them into microparticles is challenging.
  • Microfluidic devices enable precise control over droplet formation for advanced material synthesis.

Purpose of the Study:

  • To develop a microfluidic method for fabricating core-shell polyimide aerogel microparticles.
  • To investigate the influence of surfactants and process parameters on microparticle formation.

Main Methods:

  • Utilized a simple microfluidic device for sequential, step-wise emulsification in an oil-in-oil-in-oil system.
  • Polymerized polyimide sol as a shell around a silicone oil core.
  • Isolated gel microparticles and employed supercritical drying to obtain aerogels.

Main Results:

  • Successfully fabricated core-shell polyimide aerogel microparticles with controlled shell thickness and diameter.
  • Demonstrated the formation of stable double emulsions, preventing coalescence and rupture.
  • Investigated the impact of flow rates and shell liquid viscosity on microparticle characteristics.

Conclusions:

  • The microfluidic O/O/O emulsion system is effective for producing core-shell polyimide aerogel microparticles.
  • Process parameters in the microfluidic device significantly influence the morphology of the resulting microparticles.
  • This fabrication technique offers a pathway for creating tailored microscale aerogel structures.