Transport properties in ionic liquids and ionic liquid mixtures : the challenges of NMR pulsed field gradient diffusion measurements

Annat, Gary, MacFarlane, Douglas R. and Forsyth, Maria 2007, Transport properties in ionic liquids and ionic liquid mixtures : the challenges of NMR pulsed field gradient diffusion measurements, Journal of physical chemistry B : condensed matter, materials, surfaces, interfaces and biophysical, vol. 111, no. 30, pp. 9018-9024.

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Title Transport properties in ionic liquids and ionic liquid mixtures : the challenges of NMR pulsed field gradient diffusion measurements
Author(s) Annat, Gary
MacFarlane, Douglas R.
Forsyth, Maria
Journal name Journal of physical chemistry B : condensed matter, materials, surfaces, interfaces and biophysical
Volume number 111
Issue number 30
Start page 9018
End page 9024
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 2007-07-04
ISSN 1520-6106
1520-5207
Summary Pulsed field gradient NMR is a powerful method for the measurement of diffusion coefficients in liquids and solids and has begun to attract much attention in the ionic liquids field. However, aspects of the methodology as traditionally applied to solutions may not be uniformly applicable in these more viscous and chemically complex systems. In this paper we present data which shows that the Pulsed Gradient Spin Echo (PGSE) method in particular suffers from intrinsic internal gradients and can produce apparent diffusion coefficients which vary by as much as 20% for different 1H nuclei within a given moleculean obvious anomaly. In contrast, we show that the Pulsed Gradient Stimulated Echo method does not suffer from this problem to the same extent and produces self-consistent data to a high degree of accuracy (better than 1%). This level of significance has allowed the detection, in this work, of subtle mixing effects in [C3mpyr][NTf2] and [C4mpyr][NTf2] mixtures.
Language eng
Field of Research 039999 Chemical Sciences not elsewhere classified
Socio Economic Objective 970103 Expanding Knowledge in the Chemical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2007, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30030055

Document type: Journal Article
Collection: Institute for Technology Research and Innovation
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