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Superchaotropic nano-ions as foam stabilizers.

Max Hohenschutz1, Isabelle Grillo2, Charles Dewhurst2

  • 1Institut de Chimie Séparative de Marcoule, ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France.

Journal of Colloid and Interface Science
|June 29, 2021
PubMed
Summary

Superchaotropic ions, like SiW, effectively stabilize non-ionic surfactant foams by inducing electrostatic repulsions, leading to thicker, uniform foam films. This demonstrates their potential as powerful foam stabilizers.

Keywords:
Foam SANSMixed surfactant foamNano-ionStable foamSuperchaotrope

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Area of Science:

  • Colloid and Surface Science
  • Materials Chemistry
  • Physical Chemistry

Background:

  • Weakly hydrated nanometric ions, termed superchaotropes, adsorb strongly to non-ionic surfaces.
  • This adsorption alters surface physical-chemical properties via a charging effect.
  • Superchaotropic ions show potential as stabilizing agents for non-ionic colloidal systems, including foams.

Purpose of the Study:

  • To investigate the stabilizing effect of the superchaotropic Keggin-ion SiW12O40(4-) (SiW) on non-ionic surfactant foams.
  • To elucidate the impact of SiW on foam stability, liquid drainage, and bubble size.
  • To understand the mechanism of SiW adsorption and its influence on foam film structure.

Main Methods:

  • Foams of non-ionic surfactant BrijO10 were studied with and without SiW.
  • Image analysis and conductimetry were used to assess foam stability and drainage under free drainage conditions.
  • Small angle neutron scattering (SANS) was employed to analyze foam films in a dry, quasi-stationary state.

Main Results:

  • SiW at millimolar concentrations significantly stabilizes non-ionic surfactant foams.
  • Stabilization is achieved by inducing electrostatic repulsions between foam film interfaces, resulting in thicker, monodisperse films.
  • SiW adsorbs to polar heads of non-ionic surfactants via the superchaotropic effect, contrasting with SDS adsorption via hydrophobic effects.

Conclusions:

  • Superchaotropic ions, exemplified by SiW, are effective stabilizers for non-ionic surfactant foams.
  • The study demonstrates the potential of superchaotropic ions for stabilizing colloidal systems.
  • The mechanism involves electrostatic repulsions driven by superchaotropic adsorption, leading to enhanced foam properties.