1. Department of Chemical Engineering and Materials Science, University of Minnesota 1 , Minneapolis, Minnesota 55455
2. Department of Materials Science and Engineering, Massachusetts Institute of Technology 2 , Cambridge, Massachusetts 02139
3. Department of Materials Science and Engineering, Pennsylvania State University 3 , University Park, Pennsylvania 16802
4. Departments of Physics, and Engineering Science and Mechanics, Pennsylvania State University 4 , University Park, Pennsylvania 16802
5. Department of Aerospace Engineering and Mechanics, University of Minnesota 5 , Minneapolis, Minnesota 55455