1. Aerospace Division, Defence Science and Technology Group, Melbourne 3207, Australia
2. Centre for Materials and Surface Science, Department of Chemistry and Physics, La Trobe University, Melbourne 3086, Australia
3. School of Science, RMIT University, GPO Box 2476, Melbourne 3001, Australia
4. Department of Mechanical Engineering, Department of Materials Science and Engineering, and Center for Composite Materials, University of Delaware, Newark, Delaware 19716, United States