1. School of Materials Science and Technology
2. China University of Geosciences
3. Beijing 100083, P.R. China
4. Department of Mechanical and Mechatronics
5. University of Waterloo
6. Waterloo N2L 3G1, Canada
7. Waterloo Institute for Nanotechnology
8. Mechanical, Aerospace, & Biomedical Engineering Department
9. University of Tennessee – Knoxville