1. Department of Applied Physics Aalto University School of Science P.O. Box 15100 Aalto Espoo FI‐00076 Finland
2. Center of Fundamental and Advanced Technical Research Romanian Academy 24 Mihai Viteazul str. Timisoara 300223 Romania
3. VTT Technical Research Centre of Finland Ltd. P.O. Box 1000 Espoo FI‐02044 VTT Finland
4. Department of Bioproducts and Biosystems Aalto University School of Chemical Engineering P.O. Box 15100 Aalto Espoo FI‐00076 Finland