| 초록 |
Amphiphilic AuNPs functionalized with hydrophobic and hydrophilic ligands have shown diverse adsorption behaviors at the oil-water interface depending on their surface properties. In this study, we investigated the effect of ionic strength on the adsorption of amphiphilic AuNPs at hexane-water interface. Three different monovalent ion salts such as LiCl, KCl, and tetramethylammonium chloride (TMACl) with different ionic strength were added to amphiphilic AuNPs solution. All experimental results could be fitted well by Langmuir isotherm model, in which the equilibrium constant (K) and maximum uptake concentration of AuNPs (Cmax) were readily obtained. The values of K and Cmax become larger as increasing the ionic strength (LiCl ＞ KCl ＞ TMACl), in which a decrease in electrostatic repulsions between AuNPs plays an important role in decrease the distance between AuNPs at the interface. |
