1. Department of Materials Science and Engineering The Pennsylvania State University University Park PA 16802 USA
2. PolyK Technologies State College PA 16803 USA
3. Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing 100081 P. R. China
4. Media Lab MIT Cambridge MA 02139 USA
5. Materials Research Institute The Pennsylvania State University University Park PA 16802 USA
6. Department of Engineering Science and Mechanics The Pennsylvania State University University Park PA 16802 USA
7. Department of Mathematics The Pennsylvania State University University Park PA 16802 USA