1. Laboratory of Polymeric Materials and Biosorbents, Federal University of São Carlos-Campus Araras, Rodovia Anhanguera, km 174-SP-330, Caixa Postal 153, 13600-970, Araras, SP, Brasil
2. Physical and Chemistry Institute, Federal University of Itajubá, Itajubá, 13610-180, Brazil
3. Physical Department, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil
4. Laboratory of Hybrid Materials, Federal University of São Paulo, Diadema, 31270-901, Brazil