1 Laboratory of Polymers and Dyes Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, 541 24, Thessaloniki, Greece.
2 Department of Mineralogy-Petrology-Economic Geology, Aristotle University of Thessaloniki, GR-54 124, Thessaloniki, Greece.
3 Laboratory of Polymers and Dyes Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, 541 24, Thessaloniki, Greece. axilias@chem.auth.gr.