Analysis of velocity cross-correlation and preferential solvation for the system N-methylpyrrolidone–water at 20 °C

Abstract

Viscosity, density, diffusion and self-diffusion data have been collected on the system N-methylpyrrolidone–water at 20 °C over the entire composition range. From density and vapour pressure data, affinities, G_αβ(α,β= 1, 2), were computed and compared with the velocity cross-correlation coefficients, f_αβ. Good agreement was found between the interpretation of dynamic, f_αβ, and thermodynamic, G_αβ, data. Both data are in favour of preferential solute–solvent interactions leading to short-lived hydration aggregates.