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Yield stress-enabled microencapsulation of field responsive microparticle suspensions.

Samuel R Wilson-Whitford1,2, Maria Chiara Roffin1,3, Jinghui Gao1

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Summary

Pickering stabilization can trap microparticles, hindering their function within microcapsules. This study introduces a method using yield stress gels to suspend particles, allowing external field manipulation for controlled particle release after encapsulation.

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Area of Science:

  • Materials Science
  • Colloid and Interface Science
  • Chemical Engineering

Background:

  • Microencapsulation often involves trapping particles at interfaces, a phenomenon known as Pickering stabilization.
  • Pickering stabilization irreversibly embeds particles in microcapsule membranes, which is problematic when particles need to remain suspended within the core.

Purpose of the Study:

  • To develop a general procedure to prevent detrimental Pickering stabilization in microencapsulation.
  • To enable controlled suspension and spatial manipulation of microparticles within microcapsule cores.

Main Methods:

  • Utilizing yield stress materials as the core medium for microcapsules.
  • Employing an external field to manipulate the spatial distribution of encapsulated particles.

Main Results:

  • Yield stress gels effectively suspend particles against sedimentation.
  • The gel's yield stress is sufficient for particle suspension but allows mobility under an external field.
  • External fields disrupt the gel network, enabling particle movement post-encapsulation.

Conclusions:

  • A novel method using yield stress materials overcomes limitations of Pickering stabilization in microencapsulation.
  • This technique allows for controlled particle positioning and suspension within microcapsules, preserving particle functionality.