1. Institute of Chemistry, University of Campinas (UNICAMP), P.O. Box 6154, 13083-970 Campinas, São Paulo, Brazil
2. Brazilian Synchrotron Light Laboratory, CNPEM, 13083-100 Campinas, São Paulo, Brazil
3. Department of Chemical Engineering, Federal University of São Carlos, P.O. Box 676, 13565-905 São Carlos, São Paulo, Brazil