1. Department of Mechanical Engineering, University of North Dakota, Grand Forks, North Dakota 58201, United States
2. Biomedical Engineering Program, School of Computer Science and Electrical Engineering, University of North Dakota, Grand Forks, North Dakota 58201, United States
3. Department of Chemical Engineering, University of North Dakota, Grand Forks, North Dakota 58201, United States
4. NDSU Electron Microscopy Center, North Dakota State University, Fargo, North Dakota 58102, United States