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Atomistic Reverse Nonequilibrium Molecular Dynamics Simulation of the Viscosity of Ionic Liquid 1-n-butyl 3-methylimidazolium Bis(trifluoromethylsulfonyl)imide [bmim][Tf

Atomistic Reverse Nonequilibrium Molecular Dynamics Simulation of the Viscosity of Ionic Liquid 1-n-butyl 3-methylimidazolium Bis(trifluoromethylsulfonyl)imide [bmim][Tf

Rouhollah Safinejad, Nargess Mehdipour, Hossein Eslami

Phys Chem Chem Phys. 2018 Aug 22;20(33):21544-21551.

PMID: 30094445

Abstract:

The shear viscosity of room-temperature ionic liquid (IL) 1-n-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [bmim][Tf2N] is calculated over a temperature range 298-353 K, using the reverse nonequilibrium molecular dynamics simulation technique. The results of this work show that while the use of equilibrium molecular dynamics simulation techniques might be inefficient for viscosity calculations of ILs, the reverse nonequilibrium molecular dynamics technique is an efficient tool for this purpose. Our findings indicate that the shear rate for crossover from the Newtonian plateau to the shear thinning regime, corresponds to the relaxation time for the slowest microscopic scale motions, i.e., exchange of counterions in an ion's solvation shell (ion-pair relaxation time). The closeness of the time scales and activation energies for zero-shear-rate viscosities to the relaxation times and the corresponding activation energies for ion-pair formation/rupture, connects macroscopic dynamic properties with local atomic-level motions of the IL. The calculated viscosity coefficients and relaxation times for reorientations of the cation and anion as well as their corresponding activation energies are in very good agreement with experimental data.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1017254635	1,3-Dimethoxy-2-methylimidazolium bis(trifluoromethylsulfonyl)imide		1017254-63-5	Price

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