1. MPI für Kolloid- und Grenzflächenforschung, Rudower Chaussee 3, D-12489 Berlin, Germany, Institute of Colloid Chemistry and Chemistry of Water, 42 Vernadsky Avenue, 252680 Kiev, Ukraine, ICFAM-CNR, Via De Marini 6, I-16149, Genoa, Italy, and Institute of Technical Ecology, Blvd. Shevchenko 25, 340017 Donetsk, Ukraine