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NMR molecular dynamics study of chromonic liquid crystals Edicol Sunset Yellow doped with salts
Author(s) -
Almeida Martins João P.,
Chávez Fabián Vaca,
Sebastião Pedro J.
Publication year - 2014
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.4091
Subject(s) - chemistry , liquid crystal , relaxometry , molecular dynamics , relaxation (psychology) , phase (matter) , proton nmr , larmor precession , proton , ion , chemical physics , nuclear magnetic resonance , computational chemistry , condensed matter physics , magnetic field , stereochemistry , organic chemistry , spin echo , physics , medicine , psychology , social psychology , quantum mechanics , magnetic resonance imaging , radiology
We investigate the effect of monoatomic salts on the molecular dynamics in the nematic and isotropic phases formed by the chromonic liquid crystal Edicol Sunset Yellow. The study was carried out using proton nuclear magnetic resonance relaxometry. To analyse the effect of incorporation of additional sodium chloride or lithium chloride on the solutions’ molecular dynamics, the spin‐lattice relaxation time was measured for Larmor frequencies between 10kHz and 100MHz. In the nematic phase, the presence of additional sodium or lithium ions seems to contribute to an increase of the rotations/reorientations correlation times in comparison with the mixture without extra ions. The collective motions detected by proton NMR relaxometry are associated with collective fluctuations of molecules within the stacks in the nematic phase and with order parameter fluctuations in the isotropic phase. Copyright © 2014 John Wiley & Sons, Ltd.