The authors thank Fundação para a Ciência e a Tecnologia (FCT), Portugal, for financial support (CIENCIA 2007 program for Sónia Carabineiro (SAC)), and project PTDC/EQU-ERQ/101456/2008, financed by Fundação para a Ciência e Tecnologia (FCT) and FEDER in the context of Programme COMPETE. Funds from Mexican Consejo Nacional de Ciencia y Tecnologia (CONACYT) grant No. 79062 and Programa de Apoyo a Proyectos de Investigación e Innovación Tecnológica (PAPIT-UNAM) grant No. IN 100908 are also acknowledged. The authors thank Laboratorio de Investigaciones en Nanociencias y Nanotecnologia (LINAN) laboratory from IPICyT for providing microscopy and simulation services for this work.
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