Behavior of aqueous stable colloidal nano-C 60 aggregates exposed to TX100 micelles under different environmental conditions

C 60 , as one of carbon nanomaterials widely used in various fields, could be released into the water environment thus exerting some potential health risks to human beings. This work examined the behavior of aqueous stable colloidal nano-C 60 (nC 60 ) aggregates under different environmental conditions including Polyethylene glycol octylphenol ether (TX100) micelles concentration, pH, and reaction time when exposed to TX100 micelles. Results show that the nC 60 aggregates became more dispersive and restored the capability of generating the singlet oxygen when exposed to TX100 micelles. With the increase of TX100 concentration, smaller average size of nC 60 aggregates was observed in dynamic light scattering (DLS) analysis, the fluorescence intensity of TX100 was more quenched by nC 60 aggregates, and the kinetic rate constant of generating the singlet oxygen for nC 60 aggregates was improved. The mean size of nC 60 aggregates in the presence of TX100 had no obvious variations when the pH ranged from 4 to 8. The longer reaction time between nC 60 aggregates and TX100 led to a higher kinetic rate constant of generating the singlet oxygen. Collective data suggest that variations in physicochemical properties of nC 60 aggregates are strongly dependent on the surrounding media under different environmental conditions and directly govern nC 60 ’s transport behavior and potential toxicity.