1. School
of Mechanical, Materials and Mechatronics Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia
2. Electron
Microscope Unit, The University of New South Wales, Sydney, New South Wales 2052, Australia
3. Ningbo
Key Laboratory of Marine Protection Materials, Ningbo Institute of
Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China
4. Australian Synchrotron, 800 Blackburn
Road, Clayton, Victoria 3168, Australia