About the Authors

Samuel W. Bennett
Dongxu Zhou
Randall Mielke
Arturo A. Keller


Affiliation University of California Center on the Environmental Implications of Nanotechnology and Bren School of Environmental Science and Management, University of California Santa Barbara, Santa Barbara, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SWB DZ AAK. Performed the experiments: SWB DZ RM. Analyzed the data: SWB DZ AAK. Contributed reagents/materials/analysis tools: AAK. Wrote the paper: SWB DZ AAK.