Effect of electrolytes on bubble coalescence

  title={Effect of electrolytes on bubble coalescence},
  author={Vincent S. J. Craig and Barry W. Ninham and Richard Mark Pashley},
THE foaminess of ocean waves, relative to fresh water, has long been attributed to the effect of salts in reducing bubble coalescence9. This phenomenon is exploited in extraction processes using froth flotation1, in which the extraction efficiency increases as the bubble size gets smaller. But whereas the bubble-stabilizing effect of surfactants is well understood, the effect of salts is not; the fact that salts decrease the surface tension of water and that they are desorbed from the air–water… 
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A quantitative review of the transition salt concentration for inhibiting bubble coalescence.


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The hydrophobic interaction is long range, decaying exponentially with distance
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