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Article overview
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Enhanced density fluctuations in water-ethanol mixtures at low ethanol concentrations: Temperature dependent studies | | Rikhia Ghosh
; Biman Bagchi
; | | Date: |
2 May 2016 | | Abstract: | Since the structural transformations observed in water-ethanol binary
mixtures are apparently driven by relatively weak intermolecular forces (like
hydrophobicity and hydrogen bonding) that often cooperate to form self
assembled structures, one expects the aggregation properties to show strong
temperature dependence. We study the effect of temperature on the formation of
transient ethanol clusters as well as on the dynamic density heterogeneity
induced in the system due to such clustering. The dynamic heterogeneity is
expected to occur on small length scales with short lifetime and both are
expected to be temperature dependent. Indeed, a major finding of the work is
strong temperature dependence of the extent of structural heterogeneity.
Distinct signature of static and dynamic heterogeneity of ethanol molecules is
also found to appear with lowering of temperature. This is attributed to the
formation of transient ethanol clusters that are known to exhibit considerably
small lifetime (order of a few picosecond). The transient dynamical features of
dynamic heterogeneity are expected to affect those relaxation processes
occurring at sub-picosecond time scales. On the other hand, strong temperature
dependence of micro-structure formation can be anticipated to be due to
enhanced structural order stimulated in the system with lowering of
temperature. Present analyses reveal a number of interesting features which
were not explored beforehand in this widely studied binary mixture. | | Source: | arXiv, 1605.0386 | | Services: | Forum | Review | PDF | Favorites | |
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