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Spatial mapping of flow-induced molecular alignment in a noncrystalline biopolymer fluid using double quantum filtered (DQF) 23Na MRI

Pavlovskaya, Galina E.; Meersmann, Thomas

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Abstract

Flow-induced molecular alignment was observed experimentally in a non-liquid- crystalline bioplymeric fluid during developed tubular flow. The fluid was comprised of rigid rods of the polysaccharide xanthan and exhibited shear-thinning behavior. Without a requirement for optical transparency or the need for an added tracer, 23Na magic angle (MA) double quantum filtered (DQF) magnetic resonance imaging (MRI) enabled the mapping of the anisotropic molecular arrangement under flow conditions. A regional net molecular alignment was found in areas of high shear values in the vicinity of the tube wall. Furthermore, the xanthan molecules resumed random orientations after the cessation of flow. The observed flow-induced molecular alignment was correlated with the rheological properties of the fluid. The work demonstrates the ability of 23Na MA DQF magnetic resonance to provide a valuable molecular-mechanical link.

Journal Article Type Article
Publication Date Jul 16, 2014
Journal Journal of Physical Chemistry Letters
Electronic ISSN 1948-7185
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 5
Issue 15
APA6 Citation Pavlovskaya, G. E., & Meersmann, T. (2014). Spatial mapping of flow-induced molecular alignment in a noncrystalline biopolymer fluid using double quantum filtered (DQF) 23Na MRI. Journal of Physical Chemistry Letters, 5(15), doi:10.1021/jz501075j
DOI https://doi.org/10.1021/jz501075j
Keywords Flow-induced alignment; NMR; Sodium-23; Rheology; Quadrupolar coupling; Oscillatory shear; Non-Newtonian
Publisher URL http://pubs.acs.org/doi/abs/10.1021/jz501075j
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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