1. Nicholas School
of the Environment and Center for the Environmental Implications of
Nanotechnology, Duke University, Durham,
North Carolina 27708-0328, United States
2. Department of Civil & Environmental Engineering and Center for the Environmental Implications of Nanotechnology, Duke University, Durham, North Carolina 27708, United States
3. CEREGE UMR 6635 CNRS Aix-Marseille Univ, iCEINT international Consortium for the Environmental
Implications of NanoTechnology, 13545 Aix en Provence, France
4. Department
of Chemistry, Duke University, Durham, North Carolina 27708, United States