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Selective emulsion inversion in an equilibrium Janus drop. 1. Unlimited space.

S E Friberg1

  • 1Ugelstad Laboratory, NTNU, Trondheim, NO, Norway.

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PubMed
Summary

Janus emulsions can undergo catastrophic inversion. Increasing the volume of one oil phase can selectively invert the emulsion from oil-in-water to water-in-oil, altering drop structure.

Keywords:
Emulsion InversionEmulsion drop topologyInterface equilibrium and spreadingJanus emulsionsMicrofluidics

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Area of Science:

  • Colloid and Surface Science
  • Materials Science

Background:

  • Janus emulsions, with distinct properties on each hemisphere, are crucial in advanced materials.
  • Understanding their stability and phase inversion is key for controlling emulsion behavior.

Purpose of the Study:

  • To investigate the conditions leading to catastrophic phase inversion in a single Janus emulsion drop.
  • To analyze the structural transformation of Janus drops under varying oil and water phase volumes.

Main Methods:

  • Utilized local equilibrium calculations to model a single Janus drop composed of two immiscible oils (O1, O2) in an aqueous continuous phase.
  • Systematically varied the relative volume of O2 (lower interfacial tension) while maintaining the O1 radius constant.
  • Calculated the limiting coverage of O1 by O2 and simulated phase inversion by reducing the aqueous phase volume.

Main Results:

  • Determined the limiting fraction of O1 covered by O2 for infinite O2 volume.
  • Demonstrated selective emulsion inversion from (O1+O2)/W to (W+O1)/O2 upon reduction of the continuous aqueous phase volume.
  • Observed subsequent reduction in the size and radius of the water cap with further water removal.

Conclusions:

  • Catastrophic inversion of Janus emulsion drops is achievable by manipulating phase volumes and interfacial tensions.
  • The study provides a predictive framework for controlling Janus emulsion morphology and stability.