1. School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
2. Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
3. Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, United States
4. Mechanical, Aerospace, and Nuclear Engineering Department, Rensselaer Polytechnic Institute, Troy, New York 12180, United States