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Bubble nucleation in micellar solution: a density functional study.

Pankaj A Apte1, Isamu Kusaka

  • 1The Koffolt Laboratories, The Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, Ohio 43210, USA.

The Journal of Chemical Physics
|December 21, 2004
PubMed
Summary
This summary is machine-generated.

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Adding non-ionic surfactant to solutions lowers the energy barrier for bubble nucleation, especially at higher concentrations. Micelles can assist bubble formation at moderate negative pressures.

Area of Science:

  • Physical Chemistry
  • Soft Matter Physics
  • Computational Chemistry

Background:

  • Bubble nucleation is crucial in phase transitions and material processing.
  • Understanding nucleation in complex fluids like micellar solutions is challenging.
  • Negative pressure conditions offer unique insights into fluid stability.

Purpose of the Study:

  • To investigate the free energetics of bubble nucleation in micellar solutions under negative pressure.
  • To determine the effect of surfactant concentration on the nucleation barrier.
  • To explore micelle-assisted bubble nucleation mechanisms.

Main Methods:

  • Utilized a density functional model for a two-component non-ionic surfactant solution.
  • Represented solvent as single hard-core spheres and surfactant as two tangent hard-core spheres.

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  • Modeled attractive interactions using the 1/R(6) form.

    • Main Results:

    • The free energy barrier for bubble nucleation is consistently lower in binary surfactant solutions compared to pure solvents.
    • Increasing surfactant mole fraction further decreases the nucleation barrier.
    • At moderately low negative pressures, stable micelles can facilitate bubble nucleation, lowering the barrier.

    Conclusions:

    • Surfactants significantly reduce the energetic cost of bubble nucleation in solutions.
    • Micelles provide a pathway for bubble formation, particularly at specific negative pressure ranges.
    • The liquid-liquid miscibility of the system is linked to micelle-mediated bubble nucleation.