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Ion-Specific Bubble Coalescence Dynamics in Electrolyte Solutions.

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Dissolved ions significantly impact bubble coalescence time, affecting industrial processes. This study reveals how electrolytes like NaCl and Na2SO4 retard coalescence by influencing thin film drainage dynamics.

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Area of Science:

  • Fluid dynamics
  • Colloid and surface science
  • Electrochemistry

Background:

  • Bubble coalescence is critical in industrial applications like froth flotation and thermal management.
  • The presence of dissolved ions in the liquid phase influences bubble coalescence dynamics.
  • Understanding thin electrolyte film behavior between a bubble and a substrate is key to controlling coalescence.

Purpose of the Study:

  • To investigate the effect of electrolyte concentration and ion type on thin film drainage and bubble coalescence.
  • To develop a numerical model incorporating surface tension gradients and electric double layer (EDL) effects.
  • To elucidate the role of Marangoni stresses and EDL in determining bubble coalescence time scales.

Main Methods:

  • Development of a thin-film equation-based numerical model.
  • Inclusion of ion concentration-dependent surface tension gradients and EDL.
  • Analysis of Marangoni stresses and EDL influence on fluid drainage dynamics.

Main Results:

  • Certain electrolytes (NaCl, Na2SO4, NaI) retard bubble coalescence, while others (HCl, HNO3) have minimal effect.
  • Increased electrolyte concentration enhances Marangoni stresses, slowing drainage and promoting dimple formation.
  • EDL and van der Waals forces dictate final thin film dynamics on hydrophilic substrates, leading to stable electrolyte layers.
  • Higher NaCl concentrations reduce stabilizing film thickness; Na2SO4 stabilizes at smaller thicknesses due to cation valency.

Conclusions:

  • Electrolyte composition and concentration are crucial factors governing bubble coalescence time.
  • Marangoni stresses and EDL interactions play significant roles in the hydrodynamics of thin electrolyte films.
  • The findings provide insights for controlling bubble coalescence in various industrial processes.