Micron-sized antibubbles with tunable stability

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21 Citations (Scopus)

Abstract

Stable antibubbles, i.e. droplet-containing bubbles, with sizes in the micron range were produced. The antibubbles derive their stability from colloidal particles adsorbed at their interfaces. Antibubbles were produced by first making a particle-stabilized water-in-oil-in-water emulsion in which the water phases contain a solute that becomes glassy upon drying and in which the oil is volatile. This double emulsion was subsequently freeze-dried to remove both the water and the oil. Reconstituting the resulting powder in water led to the formation of antibubbles. It was shown that thus produced antibubbles have good barrier properties and that their stability, and thus their sensitivity to release triggers, is controlled by the hydrophobicity of the colloidal particles at the interfaces. When made to release, antibubbles release their core droplets almost instantaneously. This makes antibubbles excellent candidates for controlled release applications.

Original languageEnglish
Pages (from-to)15-20
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume419
DOIs
Publication statusPublished - Feb 2013
Externally publishedYes

Keywords

  • Antibubbles
  • Controlled release
  • Double emulsions
  • Encapsulation
  • Inverse bubbles
  • Pickering stabilization

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