1. Center for Research on Advanced Fiber Technologies (CRAFT) Materials Research Institute Department of Engineering Science and Mechanics Pennsylvania State University University Park PA 16802 USA
2. Department of Materials Science and Engineering A. J. Drexel Nanomaterials Institute Drexel University Philadelphia PA 19104 USA
3. Huck Institute of Life Sciences Department of Biochemistry and Molecular Biology Pennsylvania State University University Park PA 16802 USA