1. C Sequeira Chemical Engineering, Instituto Superior Técnico, Lisboa, 1049-001, Portugal
2. D Cardoso Instituto Superior Técnico, University of Lisbon Center of Physics and Engineering of Advanced Materials, Lisboa, Portugal
3. L Amaral Instituto Superior Técnico, University of Lisbon Center of Physics and Engineering of Advanced Materials, Lisboa, Portugal
4. B Sljukic Instituto Superior Técnico, University of Lisbon Center of Physics and Engineering of Advanced Materials, Lisboa, Portugal
5. D Santos Instituto Superior Técnico, University of Lisbon Center of Physics and Engineering of Advanced Materials, Lisboa, 1049-001, Portugal