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Since the structural transformations observed in water-ethanol binarymixtures are apparently driven by relatively weak intermolecular forces (likehydrophobicity and hydrogen bonding) that often cooperate to form selfassembled structures, one expects the aggregation properties to show strongtemperature dependence. We study the effect of temperature on the formation oftransient ethanol clusters as well as on the dynamic density heterogeneityinduced in the system due to such clustering. The dynamic heterogeneity isexpected to occur on small length scales with short lifetime and both areexpected to be temperature dependent. Indeed, a major finding of the work isstrong temperature dependence of the extent of structural heterogeneity.Distinct signature of static and dynamic heterogeneity of ethanol molecules isalso found to appear with lowering of temperature. This is attributed to theformation of transient ethanol clusters that are known to exhibit considerablysmall lifetime (order of a few picosecond). The transient dynamical features ofdynamic heterogeneity are expected to affect those relaxation processesoccurring at sub-picosecond time scales. On the other hand, strong temperaturedependence of micro-structure formation can be anticipated to be due toenhanced structural order stimulated in the system with lowering oftemperature. Present analyses reveal a number of interesting features whichwere not explored beforehand in this widely studied binary mixture.

Enhanced density fluctuations in water-ethanol mixtures at low ethanol concentrations: Temperature dependent studies