1. School of Materials EngineeringBirck Nanotechnology CenterPurdue University West Lafayette IN 47907 USA
2. Department of Comparative PathobiologyCollege of Veterinary MedicinePurdue University West Lafayette IN 47907 USA
3. School of Agriculture and BioengineeringBrick Nanotechnology Research CenterPurdue University West Lafayette IN 47907 USA
4. Department of Basic Medical SciencesBirck Nanotechnology CenterCollege of Veterinary MedicinePurdue University West Lafayette IN USA
5. Davidson School of Chemical EngineeringPurdue University West Lafayette IN 47907 USA