Temperature Dependence of Static and Dynamic Heterogeneities in a Water-Ethanol Binary Mixture and a Study of Enhanced, Short Lived Fluctuations at Low Concentrations

Ghosh, Rikhia and Bagchi, Biman (2016) Temperature Dependence of Static and Dynamic Heterogeneities in a Water-Ethanol Binary Mixture and a Study of Enhanced, Short Lived Fluctuations at Low Concentrations. In: JOURNAL OF PHYSICAL CHEMISTRY B, 120 (49). pp. 12568-12583.

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Abstract

Many aqueous binary mixtures, such as water ethanol, are known to exhibit multiple structural transformations that are apparently driven by intermolecular hydrophobic interaction as well as hydrogen bonding. These interactions often cooperate to form special types of self assembled structures. We study the effect of temperature on the formation of transient ethanol clusters as well as on the transient dynamic heterogeneity induced in the system due to such clustering. A major finding of the work is the existence of a strong temperature dependence of the extent of structural heterogeneity. Distinct signatures of dynamic heterogeneity of ethanol molecules are also found to appear with lowering of temperature. This is attributed to the formation of transient ethanol clusters that are known to have a small lifetime (of the order of a few picoseconds only). The transient dynamical features of dynamic heterogeneity are expected to affect those relaxation processes occurring at subpicosecond time scales. The present analyses reveal a number of interesting features, which were not explored earlier in this widely studied binary mixture.

Item Type:	Journal Article
Publication:	JOURNAL OF PHYSICAL CHEMISTRY B
Additional Information:	Copy right for this article belongs to theAMER CHEMICAL SOC, 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	21 Jan 2017 08:48
Last Modified:	21 Jan 2017 08:48
URI:	http://eprints.iisc.ac.in/id/eprint/55961

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