The role of ionic surfactant on volumetric properties of n-butanol/diethylene glycol and ethanol/diethylene glycol binary mixed solvents.
Abstract
This work presents experimental data on the densities and excess molar volumes of n-butanol/diethylene glycol and ethanol/diethylene glycol binary solvent mixtures at varying alcohol compositions and different concentrations of sodium dodecyl sulphate (SDS) at 298.15 K. The excess molar volumes of the binary solvent mixtures were calculated from the experimental density data of the mixtures and the pure component solvents.
The results showed that the excess molar volumes of the n-butanol/diethylene glycol system were negative across the entire range of solvent compositions studied, with the magnitude increasing significantly with higher SDS concentrations. In contrast, the excess molar volumes (Vᴱ) for the ethanol/diethylene glycol binary system were positive throughout the composition range and gradually increased with increasing SDS concentrations.
These findings indicate that sodium dodecyl sulphate induces a contractive volume effect in the n-butanol/diethylene glycol system and an expansive volume effect—or repulsive interaction—in the ethanol/diethylene glycol binary solvent system.
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