1. G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
2. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
3. Woodward Academy, College Park, Georgia 30337, USA
4. Riverwood International Charter School, Atlanta, Georgia 30328, USA
5. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA
6. Army Research Laboratory, Adelphi, Maryland 20783, USA
7. Naval Research Laboratory, Washington, DC 20375, USA