1. Centre of Physics, University of Minho, Campus Gualtar, 4710-057 Braga, Portugal
2. Institute of Polymers & Composites IPC, University of Minho, Campus Azurém, 4804-533 Guimarães, Portugal
3. Laboratory of Research in Biofilms Rosário Oliveira (LIBRO), Centre of Biological Engineering (CEB), Campus de Gualtar, University of Minho, Braga, Portugal