1. Interdisciplinary Research Institute on Bio-Nano-Sciences, Babes-Bolyai University, Treboniu Laurian nr. 42, Cluj-Napoca 400271, Romania
2. School of Chemical and Biochemical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States
3. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States