**Acknowledgements**

The authors acknowledge the financial support from CNPq (scholarships from Molecular Biophysics graduate program, IBILCE/UNESP), FAPESP (grant # 2013/24461-7) and to the contribution from State University of São Paulo—UNESP (PROPe/PROPG), which made possible the publication of this work. We also thank Nanotechnology National Laboratory for Agriculture – LNNA (CNPq/SISNANO/MCTI) for the XRD measurements.
