Suppression of the anomalous relationship between diffusivities of cations and anions by water in imidazolium-based ionic liquids
Proton pulsed field gradient (PFG) NMR technique at high magnetic field (17.6 T) and high magnetic field gradients (up to 30 T/m) is applied to study diffusion of the anions and cations in the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate ([Emim][ETSO4]) with and without water. Excellent NMR...
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Universitätsbibliothek Leipzig
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ndltd-DRESDEN-oai-qucosa.de-bsz-15-qucosa-1927852016-01-05T03:30:10Z Suppression of the anomalous relationship between diffusivities of cations and anions by water in imidazolium-based ionic liquids Menjoge, Amrish Vasenkov, Sergey Diffusion Transport diffusion transport ddc:530 Proton pulsed field gradient (PFG) NMR technique at high magnetic field (17.6 T) and high magnetic field gradients (up to 30 T/m) is applied to study diffusion of the anions and cations in the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate ([Emim][ETSO4]) with and without water. Excellent NMR spectral resolution attained by this technique allowed high-precision monitoring of the diffusivities of the anions, cations and water in a single experiment. The PFG NMR data show that the anomalous relationship between the ion diffusivities, i.e. larger self-diffusion coefficient of the bulkier [Emim] cation than that of the less bulky [ETSO4] anion, becomes much less pronounced due to addition of water into the ionic liquid. This observation is explained by the distortion of the local structure in the ionic liquid by water molecules leading to a possible loss of the diffusion anisotropy for the cation diffusion. The reported experimental data are in a qualitative agreement with the most recent results of molecular dynamics simulations (see references 9 and 10). Universitätsbibliothek Leipzig University of Florida, Department of Chemical Engineering Universität Leipzig, Fakultät für Physik und Geowissenschaften 2016-01-04 doc-type:article application/pdf http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-192785 urn:nbn:de:bsz:15-qucosa-192785 issn:1862-4138 http://www.qucosa.de/fileadmin/data/qucosa/documents/19278/diff_fund_9%282009%293.pdf Diffusion fundamentals 9 (2009) 3, S. 1-7 eng |
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English |
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Article |
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Diffusion Transport diffusion transport ddc:530 |
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Diffusion Transport diffusion transport ddc:530 Menjoge, Amrish Vasenkov, Sergey Suppression of the anomalous relationship between diffusivities of cations and anions by water in imidazolium-based ionic liquids |
description |
Proton pulsed field gradient (PFG) NMR technique at high magnetic field (17.6 T) and high magnetic field gradients (up to 30 T/m) is applied to study diffusion of the anions and cations in the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate ([Emim][ETSO4]) with
and without water. Excellent NMR spectral resolution attained by this technique allowed high-precision monitoring of the diffusivities of the anions, cations and water in a single experiment. The PFG NMR data show that the anomalous relationship between the ion diffusivities, i.e. larger self-diffusion coefficient of the bulkier [Emim] cation than that of the less bulky [ETSO4] anion, becomes much less pronounced due to addition of water into the ionic liquid. This observation is explained by the distortion of the local structure in the ionic liquid by water molecules leading to a possible loss of the diffusion anisotropy for the cation
diffusion. The reported experimental data are in a qualitative agreement with the most recent results of molecular dynamics simulations (see references 9 and 10). |
author2 |
University of Florida, Department of Chemical Engineering |
author_facet |
University of Florida, Department of Chemical Engineering Menjoge, Amrish Vasenkov, Sergey |
author |
Menjoge, Amrish Vasenkov, Sergey |
author_sort |
Menjoge, Amrish |
title |
Suppression of the anomalous relationship between diffusivities of cations and anions by water in imidazolium-based ionic liquids |
title_short |
Suppression of the anomalous relationship between diffusivities of cations and anions by water in imidazolium-based ionic liquids |
title_full |
Suppression of the anomalous relationship between diffusivities of cations and anions by water in imidazolium-based ionic liquids |
title_fullStr |
Suppression of the anomalous relationship between diffusivities of cations and anions by water in imidazolium-based ionic liquids |
title_full_unstemmed |
Suppression of the anomalous relationship between diffusivities of cations and anions by water in imidazolium-based ionic liquids |
title_sort |
suppression of the anomalous relationship between diffusivities of cations and anions by water in imidazolium-based ionic liquids |
publisher |
Universitätsbibliothek Leipzig |
publishDate |
2016 |
url |
http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-192785 http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-192785 http://www.qucosa.de/fileadmin/data/qucosa/documents/19278/diff_fund_9%282009%293.pdf |
work_keys_str_mv |
AT menjogeamrish suppressionoftheanomalousrelationshipbetweendiffusivitiesofcationsandanionsbywaterinimidazoliumbasedionicliquids AT vasenkovsergey suppressionoftheanomalousrelationshipbetweendiffusivitiesofcationsandanionsbywaterinimidazoliumbasedionicliquids |
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1718160370244255744 |