1. Physics and Astronomy, Fuels and Energy Technology Institute, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
2. Nuclear Magnetic Resonance Facility, Mark Wainwright Analytical Centre, The University of New South Wales, Sydney, NSW 2052, Australia
3. John De Laeter Centre, Curtin University, GPO Box U1987, Perth, WA 6845, Australia