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The Ouzo Effect is the name given to the spontaneous rapid formation of an emulsion - micro and nano-scale oily droplets suspended in water - when (as an example) the alcoholic drink Ouzo is added to water (or vice versa).
'Normal' emulsions require the addition of a 'surfactant' (soap-like) chemical, and agitation, to achieve the emulsion.
The 'Ouzo' type of emulsions are stable - they don't settle out - the droplets stabilizing with an average diameter of around 3 microns
The exact electro-chemical mechanisms which produce the effect are not yet understood.
There are a number of applications of the effect in the manufacture of pseudo-latexes, silicone emulsions, and biodegradable polymeric nanocapsules etc.
See : ChemPhysChem Volume 6, Issue 2 p. 209-216
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