title: Mobility of capped silver nanoparticles under environmentally relevant conditions.
abstract: The mobility and deposition of capped silver (Ag) nanoparticles (NPs) on silica surfaces were characterized over a wide range of pH and ionic strength (IS) conditions, including seawater and freshwater. Two common organic capping agents (citrate and PVP) were evaluated. Both the capped Ag NPs and the silica surfaces were negatively charged under these environmentally relevant conditions, resulting in net repulsive electrostatics under most conditions. The steric repulsion introduced by the capping agents significantly reduced aggregation and deposition. In addition, the presence of natural organic matter in solution further decreased the deposition of either Ag NP on silica. Ag NPs were found to be highly mobile under these environmentally relevant conditions, with little or no deposition.
authors: Bren School of Environmental Science & Management, University of California at Santa Barbara, California 93106, United States.
authors: Beng Joo Reginald
authors: BJ
authors: Thio
authors: Milka O
authors: MO
authors: Montes
authors: Mahmoud A
authors: MA
authors: Mahmoud
authors: Dong-Woog
authors: DW
authors: Lee
authors: Dongxu
authors: D
authors: Zhou
authors: Arturo A
authors: AA
authors: Keller
mesh_terms: D000327:Adsorption; D019343:Citric Acid / Q000737:chemistry*; D005618:Fresh Water / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D009994:Osmolar Concentration; D011205:Povidone / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D012995:Solubility; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical; D019343:Citric Acid; D012834:Silver; D012822:Silicon Dioxide; D011205:Povidone