1. Physics Department, Natural Sciences Faculty, Ariel University, P.O.B. 3, 40700 Ariel, Israel
2. Institute of Technical Chemistry, Ural Division, Russian Academy of Science, Academika Koroleva Street 3, Perm 614013, Russia
3. Chemical Engineering, Biotechnology and Materials Department, Engineering Faculty, Ariel University, P.O.B. 3, 40700 Ariel, Israel