1. Materials Science and Engineering, University of Texas at Austin, Austin, Texas 78712, United States
2. International Iberian Nanotechnology Laboratory, 4715-330 Braga, Portugal
3. Department of Mechanical and Energy Engineering, Purdue School of Engineering & Technology, Indiana University Purdue University Indianapolis, Indianapolis, Indiana 46202 United States
4. School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47906, United States
5. Mechanical Engineering Department and IDMEC, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisboa, Portugal