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We perform an extensive computational study of binary mixtures of water andshort-chain alcohols resorting to two-scale potential models to account for thesingularities of hydrogen bonded liquids. Water molecules are represented by awell studied core softened potential which is known to qualitatively accountfor a large number of water's characteristic anomalies. Along the same lines,alcohol molecules are idealized by dimers in which the hydroxyl groups interactwith each other and with water with a core softened potential as well.Interactions involving non-polar groups are all deemed purely repulsive. Wefind that the qualitative behavior of excess properties (excess volume,enthalpy and constant pressure heat capacity) agrees with that foundexperimentally for alcohols such as t-butanol in water. Moreover, we observethat our simple solute under certain conditions acts as an "structure-maker",in the sense that the temperature of maximum density of the bulk water modelincreases as the solute is added, i.e. the anomalous behavior of the solvent isenhanced by the solute.

Temperature of maximum density and excess properties of short-chain alcohol aqueous solutions: A simplified model simulation study