1. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 W Green St., Urbana, Illinois 61801, USA
2. Lawrence Livermore National Laboratory, Livermore, California 94550, USA
3. School of Chemical Sciences, University of Illinois at Urbana-Champaign, 505 S Mathews Ave., Urbana, Illinois 61801, USA
4. Department of Mathematical and Physical Sciences, Miami University, 4200 N University Blvd., Middletown, Ohio 45042, USA