Exploring the Use of Ionic Liquid Mixtures to Enhance the Performance of Dicationic Ionic Liquids Article Swipe

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Sharon I. Lall-Ramnarine , Sophia Suarez , Eddie Fernandez , Chanele Rodriguez , Sujun Wei , Mallory Gobet , J. R. P. Jayakody , Surajdevprakash B. Dhiman , James F. Wishart ·

YOU? · · 2017 · Open Access · · DOI: https://doi.org/10.1149/2.0271708jes

Dicationic ionic liquids (DILs) of diverse structural architectures (including symmetrical and asymmetrical ammonium, phosphonium and heterodications and the bis(trifluoromethylsulfonyl)amide (NTf₂^-) anion) have been prepared and used as additives to N-methyl-N-ethoxyethylpyrrolidinium (P₁EOE) NTf₂, a relatively high-performing IL in terms of its transport properties (viscosity 53 mPa s). The three-ion, binary IL mixtures were characterized for their thermal and transport properties using differential scanning calorimetry, temperature dependent viscosity, conductivity and Pulsed Gradient Spin Echo (PGSE) NMR. Variable temperature ¹H, ¹⁹F and ³¹P self-diffusion coefficients were determined at 25, 60 and 75°C. The order of the diffusion coefficients was D(P₁EOE⁺) > D(anion) > D(dication), and the composition of the dication had a strong effect on the degree to which diffusion of all three species is more or less coupled. IL mixtures containing about 30 mol % of the dicationic NTf₂ and 70 mol % of P₁EOE NTf₂ resulted in a significant decrease in glass transition temperatures and viscosities compared to the pure DIL. The mixtures extended the liquid range and potential for practical applications significantly. Finally, the data obtained here provides insight into the future design of dicationic salts tailored to exhibit lower viscosity and higher conductivities.

Related Topics

Ionic Liquid

Chemistry

Differential Scanning Calorimetry

Concepts

Ionic liquid Dication Phosphonium Chemistry Differential scanning calorimetry Viscosity Diffusion Ion Glass transition Analytical Chemistry (journal) Ionic conductivity Amide Physical chemistry Thermodynamics Organic chemistry Polymer Electrolyte Electrode Catalysis Physics

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Type: article
Language: en
Landing Page: https://doi.org/10.1149/2.0271708jes
PDF: http://jes.ecsdl.org/content/164/8/H5150.full.pdf
OA Status: hybrid
Cited By: 13
References: 53
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DOI: https://doi.org/10.1149/2.0271708jes

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Title: Exploring the Use of Ionic Liquid Mixtures to Enhance the Performance of Dicationic Ionic Liquids

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Language: en

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Publication year: 2017

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Publication date: 2017-01-01

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Authors: Sharon I. Lall-Ramnarine, Sophia Suarez, Eddie Fernandez, Chanele Rodriguez, Sujun Wei, Mallory Gobet, J. R. P. Jayakody, Surajdevprakash B. Dhiman, James F. Wishart

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Concepts: Ionic liquid, Dication, Phosphonium, Chemistry, Differential scanning calorimetry, Viscosity, Diffusion, Ion, Glass transition, Analytical Chemistry (journal), Ionic conductivity, Amide, Physical chemistry, Thermodynamics, Organic chemistry, Polymer, Electrolyte, Electrode, Catalysis, Physics

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Cited by: 13

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