1. Department of Chemistry, University of Patras, GR-26504 Patras, Greece
2. School of Science and Technology, Hellenic Open University, Parodos Aristotelous 18, GR-26335 Patras, Greece
3. Foundation for Research and Technology, Institute of Chemical Engineering Science (FORTH/ICE-HT), Stadiou Str., Platani, P.O. Box 1414, GR-26500 Patras, Greece