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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Pickering emulsions stabilized by inside/out Janus nanotubes: Oil triggers an evolving solid interfacial layer.

Estelle Puel1, Céline Cau Dit Coumes2, Arnaud Poulesquen2

  • 1Université Paris-Saclay, CEA Saclay, CNRS, NIMBE, UMR 3685, LIONS, 91191 Gif-Sur-Yvette Cedex, France.

Journal of Colloid and Interface Science
|June 4, 2023
PubMed
Summary

Janus imogolite nanotubes (Imo-CH3) efficiently stabilize oil-in-water Pickering emulsions at low concentrations. Emulsion stability is achieved above a critical Imo-CH3 concentration due to a self-assembling interfacial layer.

Keywords:
Gel oil networkHybrid imogolitesInterfacial propertiesJanus nanotubesPickering emulsions

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Nanotechnology

Background:

  • Pickering emulsions are stabilized by solid particles at the oil-water interface.
  • Janus nanoparticles, with distinct surface properties, offer tunable interfacial behavior.
  • Imogolite nanotubes, modified to be Janus (Imo-CH3), possess unique hydrophilic/hydrophobic characteristics.

Purpose of the Study:

  • To investigate the emulsification properties of Janus imogolite nanotubes (Imo-CH3).
  • To elucidate the stabilization mechanism of Imo-CH3 in oil-in-water Pickering emulsions.
  • To determine the critical concentration for effective emulsion stabilization.

Main Methods:

  • Small Angle X-ray Scattering (SAXS) for structural analysis.
  • Interfacial observations to monitor droplet behavior.
  • Rheological measurements to assess emulsion stability.
  • Synthesis of Janus imogolite nanotubes (Imo-CH3).

Main Results:

  • Rapid interfacial stabilization of oil-in-water emulsions was achieved at a critical Imo-CH3 concentration of 0.6 wt%.
  • Below the threshold, cascading coalescence occurred, expelling excess oil.
  • Above the threshold, a robust interfacial solid layer formed from aggregated Imo-CH3 nanotubes, enhancing stability.

Conclusions:

  • Janus imogolite nanotubes (Imo-CH3) are effective stabilizers for oil-in-water Pickering emulsions.
  • A critical concentration of Imo-CH3 is essential for forming a stabilizing interfacial layer.
  • The self-assembly of Imo-CH3 nanotubes at the interface drives emulsion stability.