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Ultrasound Control of Pickering Emulsion-Based Capsule Preparation.

Filip Ratajczak1, Bassam Jameel1, Rafał Bielas1

  • 1Faculty of Physics, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland.

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|September 14, 2024
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Summary

This study introduces an ultrasound method to monitor the formation of microparticle-shelled capsules. The non-destructive technique effectively tracks structural changes during capsule fabrication using Pickering emulsions.

Keywords:
Pickering emulsioncapsulesmagnetic nanoparticlesultrasound

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry
  • Acoustics

Background:

  • Microparticle-shelled capsules, fabricated from particle-stabilized emulsions (Pickering emulsions), offer significant potential across various applications.
  • Controlling the sintering of particles to form rigid capsule shells during fabrication remains a challenge.

Purpose of the Study:

  • To develop and validate a non-destructive ultrasound method for monitoring the formation of Pickering emulsion-based capsules.
  • To assess the correlation between ultrasonic properties and structural changes during capsule synthesis.

Main Methods:

  • Fabrication of capsules using polyethylene microparticles and iron oxide nanoparticles as stabilizers for Pickering emulsions.
  • Application of an external electric field to facilitate droplet coalescence.
  • Heating under an alternating magnetic field to induce particle sintering.
  • Monitoring structural changes using non-destructive ultrasound attenuation and velocity measurements.
  • Complementary observation of droplet size changes using optical microscopy.

Main Results:

  • Ultrasonic attenuation increased during droplet coalescence, indicating detection of structural changes.
  • A more significant increase in ultrasonic attenuation was observed after magnetic heating, correlating with capsule shell formation.
  • Ultrasonic velocity measurements did not show similar variations, highlighting the specificity of attenuation.
  • Optical microscopy confirmed changes in droplet size corresponding to ultrasonic observations.

Conclusions:

  • The proposed ultrasound method non-destructively monitors structural changes during Pickering emulsion capsule formation.
  • Ultrasonic attenuation coefficient serves as a quantitative indicator for evaluating the capsule formation process.
  • This technique offers precise control over capsule shell rigidity and formation.