Journal
CHEMICAL PHYSICS
Volume 457, Issue -, Pages 87-97Publisher
ELSEVIER
DOI: 10.1016/j.chemphys.2015.05.022
Keywords
Acetonitrile-water mixtures; Density Functional Theory; Ab initio molecular dynamics; Organic-water solvents; Microheterogeneity
Funding
- CityU Start-up Grant [7200397]
- CityU SRG Fund [7004166]
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Structural properties of acetonitrile and acetonitrile-water mixtures are studied using Density Functional Theory (DFT) and ab initio molecular dynamics simulations. Stable molecular clusters consisted of several water and acetonitrile molecules are identified to provide microscopic understanding of the interaction among water and acetonitrile molecules. Ab initio molecular dynamics simulations are performed to study the liquid structure at the finite temperature. Three mixing compositions in which the mole fraction of acetonitrile equals 0.109, 0.5 and 0.891 are studied. These compositions correspond to three distinct structural regimes. At the 0.109 and 0.891 mole fraction of acetonitrile, the majority species are mostly connected among themselves and the minority species are either isolated or forming small clusters without disrupting the network of the majority species. At the 0.5 mole fraction of acetonitrile, large water and acetonitrile clusters persist throughout the simulation, exhibiting the microheterogeneous behavior in acetonitrile-water mixtures in the mid-range mixing ratio. (C) 2015 Elsevier B.V. All rights reserved.
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