Effect of electrolytes on bubble coalescence

@article{Craig1993EffectOE,
  title={Effect of electrolytes on bubble coalescence},
  author={Vincent S. J. Craig and Barry W. Ninham and Richard Mark Pashley},
  journal={Nature},
  year={1993},
  volume={364},
  pages={317-319}
}
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… 
Single Rising Bubble Motion in Aqueous Solution of Electrolyte
Effects of electrolytes on bubble coalescence are investigated experimentally from fluid dynamic point of view. Collisions of a bubble with free surface in two kinds of liquids, namely, ultrapure
Different Effects of Monovalent Anions and Cations on the Bubble Coalescence and Lifetime of Aqueous Films between Air Bubbles
Ions of inorganic salts are known to affect bubble coalescence via the surface charge density as described by the classical DLVO theory of colloid stability. Our experimental results obtained for
Ionic physisorption on bubbles induced by pulsed ultra-sound.
TLDR
It is shown here that the liquid phase resulting from the coalescence of the overflowing foam is enriched in some ions versus the initial brine and can be attributed to a weak adsorption of hydrated ions at the surfactant-water interface.
Studies on Bubble Column Evaporation in Various Salt Solutions
The physical properties of concentrated salt solutions are an important aspect of many industrial processes. The effects of different salts on the inhibition of bubble coalescence have raised some
Effect of organic matter on bubble surface tension
Bubble surface tension (BST) is measured by spinning single bubbles in a rotating cell and relating the resulting bubble deformation to the Centrifugal number Ce. Using this method, bubbles in
A quantitative review of the transition salt concentration for inhibiting bubble coalescence.
...
...

References

SHOWING 1-10 OF 11 REFERENCES
Stability of aqueous films on hydrophobic methylated silica
Experiments in which a small gas bubble was slowly advanced towards a polished silica plate under dilute aqueous solutions have shown that “thick” equilibrium films are formed not only on clean,
Cavitation and the Interaction Between Macroscopic Hydrophobic Surfaces
The interaction in water of neutral hydrocarbon and fluorocarbon surfaces, prepared by Langmuir-Blodgett deposition of surfactant monolayers, has been investigated. The attraction between these
The drainage of thin liquid films between solid surfaces
We present measurements of the thickness as a function of time of liquid films as they are squeezed between molecularly smooth mica surfaces. Three Newtonian, nonpolar liquids have been studied:
Attractive forces between uncharged hydrophobic surfaces: direct measurements in aqueous solution.
TLDR
For very hydrophobic surfaces, the cavitation effects on pulling the surfaces apart are described, and the strength of these attractive forces depends critically on the degree of hydrophobicity of the surface and is due to the long-range influence of thesurface on the structure of water.
The hydrophobic interaction is long range, decaying exponentially with distance
TLDR
From measurements of the total force as a function of distance between two hydrophobic surfaces immersed in aqueous electrolyte solutions, it is found that the hydphobic interaction has the same range as, but is about an order of magnitude stronger than, the van der Waals-dispersion force.
Effect of divalent electrolyte on the hydrophobic attraction
Measurements of the attraction between hydrophobic surfaces (chemically modified mica and mica coated with Langmuir-Blodgett films) across water, 0.01 M magnesium sulfate solution. and 0.1 M
...
...