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Selected aspects of aqueous/aqueous two phase systems

Pacek A.W.

Polish Journal of Chemical Technology

2005

Vol. 7, nr 4

24-28

It has been frequently assumed that there is a full analogy between aqueous/aqueous and oil/aqueous two phase systems. The results reported in this paper clearly indicate that this analogy is rather limited. As the interfacial tension in aqueous/aqueous systems is two-three orders of magnitude lower than in oil/aqueous systems, the mechanisms of breakage in diluted as well as the structure and stability of concentrated aqueous/aqueous dispersions are very different than oil/aqueous dispersions. Therefore, well established models describing maximum stable drop size and the limits of stability (phase inversion) in oil/aqueous systems are often not applicable in aqueous/aqueous systems.