Ion Channels and Anisotropic Ion Mobility in a Liquid-Crystalline Columnar Phase As Observed by Multinuclear NMR Diffusometry
2010 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 114, no 47, 15477-15482 p.Article in journal (Refereed) Published
The anisotropic diffusion of anions and cations in the columnar and isotropic phases of a fan-shaped imidazolium hexafluorophosphate salt is measured by H-1 and F-19 diffusion NMR experiments. The macroscopic orientation of the columnar phase is investigated by H-2 NMR spectroscopy. We find that the anions, confined by the cations, diffuse faster than the cations along the columns but slowly across them, which exemplifies the ion channel model of these materials. The cations and anions are dissociated in the columnar phase but are paired or clustered in the isotropic phase.
Place, publisher, year, edition, pages
2010. Vol. 114, no 47, 15477-15482 p.
self-organization, field-gradient, diffusion, water, assemblies, membrane
IdentifiersURN: urn:nbn:se:kth:diva-27949DOI: 10.1021/jp1082054ISI: 000284454500007ScopusID: 2-s2.0-78649495296OAI: oai:DiVA.org:kth-27949DiVA: diva2:383195
FunderSwedish Research Council
QC 201101042011-01-042011-01-032011-02-25Bibliographically approved