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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Colloid Science

Background:

  • Bubble surface mobility in aqueous solutions can be altered by alcohol additives.
  • Previous studies utilized ethanol and propanol, but the generalizability to other alcohols remains unclear.

Purpose of the Study:

  • To investigate the effect of methanol and glycerol on bubble surface mobility in aqueous solutions.
  • To determine if alcohol structure influences the modulation of bubble surface mobility.

Main Methods:

  • Characterized thin liquid film drainage between air bubbles and mica surfaces.
  • Measured mobility across varying alcohol concentrations and bubble approach velocities.
  • Compared methanol-water and glycerol-water systems.

Main Results:

  • Methanol addition increased bubble surface mobility, transitioning from immobile to mobile with concentration, similar to ethanol and propanol.
  • The critical methanol concentration for mobility transition decreased with increasing bubble approach velocity.
  • Glycerol addition did not alter bubble surface mobility, which remained tangentially immobile across all tested concentrations.

Conclusions:

  • Tunable bubble surface mobility in alcohol-water mixtures is not universal.
  • The specific molecular structure of alcohols and their interaction with water at interfaces determine surface mobility modulation.
  • Methanol's short-chain structure allows mobility tuning, while glycerol's polyalcohol structure does not.