1. Department of ChemistryUniversity of Nebraska–Lincoln Lincoln NE 68588 USA
2. Nanoscience and Technology DivisionArgonne National Laboratory Lemont IL 60439 USA
3. Department of Mechanical and Materials EngineeringUniversity of Nebraska–Lincoln Nebraska Hall Lincoln NE 68588 USA
4. Department of GeneticsCell Biology and AnatomyUniversity of Nebraska Medical CenterDurham Research Center II Omaha NE 68106 USA
5. Houston DistrictTexas Department of Transportation Houston TX 77007 USA
6. Department of Pharmaceutical SciencesUniversity of Nebraska Medical Center College of Pharmacy Omaha NE 68198 USA
7. Nebraska Center for Materials and NanoscienceUniversity of Nebraska–Lincoln Lincoln NE 68588 USA