1. Laboratory for Atomistic and Molecular Mechanics (LAMM), Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
2. Department of Materials, University of Oxford, 16 Parks Road, Oxford OX1 3PH, United Kingdom
3. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, P.R. China
4. Electron Physical Sciences Imaging Center, Diamond Light Source Ltd, Didcot OX11 0DE, United Kingdom