This is the second issue of the section "Thin Films and Foams" of Current Opinion in Colloid and Interface Science (COCIS). Practically no topic of the present 10 review articles overlaps the topics of the reviews published three years ago in our previous issue (COCIS, Vol. 13, No. 3, June 2008). This fact shows that both scientific areas - the thin liquid films and the foams - are rather vast and important areas of the colloid and interface science. The thin liquid films exist in all dispersion systems: foam films, emulsion films, films between colloid particles (nanoparticles!), asymmetric films at hetero-coagulation or at wetting phenomena, etc. Their study provides valuable information about the interactions in them and the kinetics of thinning and rupture, which determine the stability of the corresponding colloidal systems. Only one type of thin liquid film is relevant to the dispersion system foam-the foam film. On the other hand the foams are systems of great importance in industry and everyday life. In view of that we offer now to the reader two collections with equal number of review articles in each of these two large scientific areas: five reviews on thin liquid films and five reviews on foams.
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