1. School of Engineering and Applied Sciences; Harvard University; 9 Oxford Street Cambridge MA 02139 USA
2. Department of Mechanical Engineering; Massachusetts Institute of Technology; 77 Massachusetts Avenue Cambridge MA 02139 USA
3. Institute of Particle Technology; Friedrich-Alexander-University Erlangen-Nürnberg; Haberstr. 9a 91058 Erlangen Germany
4. Cluster of Excellence Engineering of Advanced Materials; Friedrich-Alexander-University Erlangen-Nürnberg; Nägelsbacherstr. 49 91054 Erlangen Germany