1. Department of Geography, College of Science; Swansea University; Swansea; SA2 8PP; UK
2. Chemistry Group, College of Engineering; Swansea University; Swansea; SA2 8PP; UK
3. School of Science and Technology; Nottingham Trent University; Nottingham; NG11 8NS; UK
4. Faculty of Engineering & Environment; Northumbria University; Newcastle upon Tyne; NE1 8ST; UK
5. Technology and Bionics, Hochschule Rhein-Waal; Nollenburger Weg 115; 46446; Emmerich; Germany