Jos� Garcia-Torres is Serra H�nter Associate Professor in the Department of Materials Science and Engineering at Universitat Polit�cnica de Catalunya (UPC). Carlos Alem�n is Full Professor of Physical Chemistry and leader of the Innovation in Materials and Molecular Engineering group in the Chemical Engineering Department at Universitat Polit�cnica de Catalunya (UPC). Ram K. Gupta is Associate Professor in the Department of Chemistry at Pittsburg State University.