1. Laboratory Environment and Mineral Processing, CNRS, Nancy-University, BP 40 - F-54501 Vandoeuvre-lès-Nancy Cedex, France, Centro de Biomedicina Molecular e Estrutural, Departamento de Quimica, Bioquimica e Farmácia, Faculdade de Ciencias e Tecnologia, Universidade do Algarve, Campus de Gambelas, 8005-139, Faro, Portugal, and Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands