1. Institute of Materials and Surface Engineering, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Paula Valdena 3/7, Riga LV-1048, Latvia
2. Institute of Technical Physics, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Paula Valdena 3/7, Riga LV-1048, Latvia
3. School of Science, STEM College, RMIT University, Melbourne, VIC 3001, Australia
4. School of Chemical and Biomedical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia
5. School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, U.K.
6. Department of Aeronautics, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.