1. Department of Aerospace Engineering, Iowa State University, Ames, Iowa 50011, USA
2. Materials and Nanotechnology Program, North Dakota State University, Fargo, ND 58108, USA
3. Zernike Institute for Advanced Materials, University of Groningen, 9747 AG, Groningen, The Netherlands
4. Department of Civil, Construction and Environmental Engineering, North Dakota State University, Fargo, ND 58108, USA