1. Department of Chemistry, Federal University of São Carlos, 13565-905, São Carlos, SP, Brazil
2. National Nanotechnology Laboratory for Agriculture, Brazilian Agriculture Research Corporation (Embrapa), XV de Novembro Street – 1452, São Carlos, Brazil
3. Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476 Potsdam, Germany
4. Department of Chemistry, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais 35400-000, Brazil
5. Department of Physics, Federal University of Minas Gerais, 31270-901, Belo Horizonte, Minas Gerais, Brazil