1. Department of Chemical and Biological Engineering, Iowa State University, Ames, Iowa 50011, United States
2. Research Center for Biorenewable Chemicals (CBiRC), Ames, Iowa 50011, United States
3. The Ames Laboratory, U.S. Department of Energy, and Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
4. Materials Analysis and Research Laboratory, Iowa State University, Ames, Iowa 50011, United States