Figure 3.

The dependence of the excess molar volume of aqueous solutions of DESs on molar fraction of deep eutectic solvent at 298.15 K: (a) for DES1; (b) for DES2; (c) for DES3; (d) for DES4; (■) experimental data; (―) calculated using the PFP model; (………) interactional contribution ($V_{int}^E$); (– – –), free volume contribution ($V_{fv}^E$); (– ▪ –), characteristic pressure contribution ($V_{P^{\ast }}^E$).