Document Detail

Binary Diffusion Coefficients for Mixtures of Ionic Liquids [EMIM][N(CN)(2)], [EMIM][NTf(2)], and [HMIM][NTf(2)] with Acetone and Ethanol by Dynamic Light Scattering (DLS).
MedLine Citation:
PMID:  23343565     Owner:  NLM     Status:  Publisher    
Mutual diffusivities for binary mixtures of the ionic liquids (ILs) [EMIM][N(CN)(2)] (1-ethyl-3-methylimidazolium dicyanimide), [EMIM][NTf(2)] (1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide), and [HMIM][NTf(2)] (1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) with acetone and ethanol were studied in dependence on composition in the temperature range from 283.15 K to 323.15 K applying dynamic light scattering (DLS). The influence of experimental parameters on the achievable uncertainties was analyzed to ensure the acquisition of accurate data in adequate measurement times. For all probed systems, increasing binary diffusion coefficients were found for increasing temperatures. The systematic variation of anion and cation of the investigated ILs as well as a comparison with literature data demonstrates the considerable influence of different ions on the resulting binary diffusion coefficients. Lower mutual diffusivities were found for the mixtures with ethanol than for those with acetone, which could be related to the formation of hydrogen bonds between ethanol and the ions. Most of the investigated IL solvent mixtures show increasing binary diffusion coefficients with increasing solvent concentration. For the mixtures of [EMIM][NTf(2)] with ethanol, however, a minimum of the mutual diffusivities was found in the ethanol mole fraction range from 0.7 to 0.8, which may hint at the vicinity to a critical demixing point. The viscosity of the pure ILs turned out to be no reliable indicator for the mutual diffusivity in mixtures with the same solvent.
Michael Heinrich Rausch; Lisa Hopf; Andreas Heller; Alfred Leipertz; Andreas Paul Fröba
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-24
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  -     ISSN:  1520-5207     ISO Abbreviation:  J Phys Chem B     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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