Interfacial tension of CO2-NaCl

CO2-CaCl2 and CO2-(NaCl+CaCl2) solution systems was studied at different salt concentration and ratio by molecular dynamics simulation

in order to understand influence of different salt ions at molecular level.The results showed that the presence of salt ions increased interfacial tension between CO2 and water

which majority was caused by number of cationic charges and the rest was by cation atomic properties such as Lennard Jones potential parameters and atomic mass.The interfacial tension increment of these three systems were all linearly dependent on ionic strength

but the slope had no relationship to types of salt solutions.This founding would provide theoretical guidance for IFT prediction.