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Ion Channels and Anisotropic Ion Mobility in a Liquid-Crystalline Columnar Phase As Observed by Multinuclear NMR Diffusometry
KTH, School of Chemical Science and Engineering (CHE), Centres, Industrial NMR Centre.
KTH, School of Chemical Science and Engineering (CHE), Centres, Industrial NMR Centre.ORCID iD: 0000-0002-6524-1441
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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
Abstract [en]

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.
Keyword [en]
self-organization, field-gradient, diffusion, water, assemblies, membrane
National Category
Physical Chemistry
URN: urn:nbn:se:kth:diva-27949DOI: 10.1021/jp1082054ISI: 000284454500007ScopusID: 2-s2.0-78649495296OAI: diva2:383195
Swedish Research Council
QC 20110104Available from: 2011-01-04 Created: 2011-01-03 Last updated: 2011-02-25Bibliographically approved
In thesis
1. Nano-segregated soft materials observed by NMR spectroscopy
Open this publication in new window or tab >>Nano-segregated soft materials observed by NMR spectroscopy
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is about using nuclear magnetic resonance (NMR) spectroscopy for studying soft materials. Soft materials may be encountered everyday by most readers of this thesis, for example when taking a shower or watching TV. The usefulness of these materials originates from them being soft yet, at the same time, having some kind of a structure. The characteristic length scale of those structures is often on the order of nanometers (10-9 m) and the structure can respond to various external stimuli such as temperature, electric and magnetic fields, or the presence of interfaces.

NMR spectroscopy excels when studying soft materials because it is a non-invasive technique with a large spectral resolution. Moreover, different NMR methods allow us to study local molecular dynamics or longer-range translational diffusion. Understanding those latter aspects is very important for the development of dynamic and responsive materials.

Papers I-III present our work on assessing molecular adsorption on interfaces in colloidal dispersions. Here, carbon nanotubes (CNTs) or silica particles were the colloidal substrates to which proteins, polymers or surfactants adsorbed. Papers IV-VI concern ionic mobility in liquid crystals (LCs). The influence of material structure on, for example, the anisotropy of diffusion or on the association/dissociation of ions was studied in several LC phases.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. 46 p.
Trita-CHE-Report, ISSN 1654-1081 ; 2011:12
nuclear magnetic resonance, soft matter, colloidal dispersion, carbon nanotubes, colloidal silica, adsorption, liquid crystals, ionic liquids, diffusion
National Category
Physical Chemistry
urn:nbn:se:kth:diva-30337 (URN)978-91-7415-876-2 (ISBN)
Public defence
2011-03-18, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 09:30 (English)
QC 20110225Available from: 2011-02-25 Created: 2011-02-23 Last updated: 2011-02-25Bibliographically approved

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Frise, Anton E.Dvinskikh, Sergey V.Furo, Istvan
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