1. Laboratory of Industrial Chemistry and Reaction Engineering, Johan Gadolin Process Chemistry Centre (PCC), Åbo Akademi University, Turku/Åbo FI-20500, Finland
2. Escuela de Ingenierías Industriales, Universidad de Valladolid, Valladolid ES-47002, Spain
3. Laboratory of Electron Microscopy, Department of Industrial Physics and Astronomy, University of Turku, Turku/Åbo FI-20500, Finland