1. School of Mechanical Engineering, Ray W. Herrick Laboratories, Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907 e-mail: jfrhoads@purdue.edu
2. Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH 43210
3. School of Engineering, Catholic University of America, Washington, DC 20064
4. School of Mechanical Engineering, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
5. Department of Mechanical and Aerospace Engineering, Florida Institute of Technology, Melbourne, FL 32901
6. Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia