2025/06/19 by Praseeda P. Nair, Aditi Prabhune, Sanjay Kumar +1
Chemical Engineering · #Thermodynamic properties of mixtures #Chemical and Physical Properties in Aqueous Solutions #Ionic liquids properties and applications
paper · doi:10.1021/acs.jced.5c00049
Thermophysical properties are crucial for various industrial applications, process designs, and modeling as they provide insight into intermolecular interactions. In this work, the binary mixtures of polar aprotic solvents dimethyl sulfoxide (DMSO) and N -methyl-2-pyrrolidone (NMP) with a polar protic solvent, water, has been investigated to assess intermolecular interactions and structural behavior. Density (ρ), molar volume ( V m ), and coefficient of thermal expansion (α P ) along with excess coefficient of thermal expansion (α P E ), excess molar volume ( V m E ), and FTIR analysis of binary mixtures were evaluated at various temperatures (293.15–318.15 K). The result reveals that a strong hydrogen-bonding network of water molecules is broken down by DMSO and NMP molecules between 0.3 and 0.4 mole fractions. The new network of hydrogen bonding formed within DMSO + water and NMP + water is strong and hetero-associated, expressed by the negative value of V m E . The packing factor in NMP + water affects V m E showing more molecular interactions than DMSO + water. The DMSO + NMP mixture reveals positive V m E values, indicating the self-association of polar solvents.