E.Llorensa, H.Ibañeza, L.J.del Valle,J.Puiggalí
aDepartament d'Enginyeria Química, Universitat Politècnica de Catalunya, Av. Diagonal 647, Barcelona E-08028, Spain
bCenter for Research in Nano-Engineering (CrNE), Universitat Politècnica de Catalunya, Edifici C, C/Pasqual i Vila s/n, Barcelona E-08028, Spain
Received 18 July 2014, Revised 19 December 2014, Accepted 7 January 2015, Available online 9 January 2015.