1. Department of Chemistry, Laboratory of Innovative Techniques of the Environment Preservation, University Brothers Mentouri, Constantine, Algeria;
2. Department of Physics, Laboratory of Thermodynamics and Material Surface Treatments, University Brothers Mentouri, Constantine, Algeria;
3. Department of Physics, Laboratory of Thin Films and Interfaces, University Brothers Mentouri, Constantine, Algeria;
4. Clay and Interface Mineralogy, RWTH, Aachen University, Aachen, Germany