Apparent molar volumes and expansivities of aqueous solutions of ionic liquids, l-alkyl-3-methylimidazolium alkyl sulfate at TÂ =Â (298.15-328.15)Â K

► Ionic liquids under study is predominantly a structure breaker due to hydrophobic hydration. ► Apparent molar volumes at infinite dilution increase with increasing alkyl chain length of cation, and anion size in the order: [EMIm][MSO4] < [HMIm][MSO4] < [HMIm][ESO4]. ► [EMIm][MSO4] interacts with water more strongly than other studied ionic liquids.