1. Rowland Institute at Harvard, Harvard University, 100 Edwin H. Land Boulevard, Cambridge, Massachusetts 02142, United States
2. AMSRD-ARL-WM-BD, Weapons & Materials Directorate, US Army Research Laboratory, Aberdeen Proving Ground, Maryland 21005-5069, United States
3. Department of Mechanical Engineering and Materials Science, Rice University, 6100 Main Street, Houston, Texas 77005, United States