1. Hephaestus Laboratory, School of Chemistry, Faculty of Sciences, Democritus University of Thrace, 65404 Kavala, Greece
2. Civil Engineering Department, School of Engineering, Democritus University of Thrace, 67100 Xanthi, Greece
3. Hephaestus Laboratory, Department of Physics, Faculty of Sciences, Democritus University of Thrace, 65404 Kavala, Greece