Hello everyone,

I have a question concerning the calculation of chi parameters for salt ions, such as sodium and chloride.

From my understanding of the attached article, this calculation can be performed using the Blends module by analyzing the mixing energy.

However, when I attempt this calculation for ions - even when modeling them in their hydrated forms - the resulting chi parameters are strongly negative. These values are not viable for subsequent parameterization in DPD simulations.

Could the issue be related to the choice of force field or the charge assignment method? I would be grateful for any insights or suggestions on the correct approach for obtaining physically meaningful chi parameters for ionic species.

Thank you in advance for your help.