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2013 | OriginalPaper | Buchkapitel

Sodium NMR Relaxation: A Versatile Non-invasive Tool for the Monitoring of Phase Transitions and the Estimation of Effective Pore Sizes of Supramolecular Hydrogels

verfasst von : M. Raue, A. Bernet, M. Küppers, S. Stapf, H.-W. Schmidt, B. Blümich, T. Mang

Erschienen in: Intelligent Hydrogels

Verlag: Springer International Publishing

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Abstract

Nuclear magnetic resonance (NMR) relaxometry of liquids is a widely used tool to characterize porous media. In particular, ²³Na NMR is an especially suitable method when applied to gels and biological tissues. In this work we investigated the thermoreversible melting and gelation processes of supramolecular hydrogels formed by succinamic acid-based amphiphiles (SAn) in a saturated aqueous NaHCO₃ solution (sat. aq. NaHCO₃ sol.). We could show that it is not only possible to determine the melting points and to monitor the gelation process with ²³Na relaxometry, but also to estimate the effective pore size based on the expanded Brownstein-Tarr model. Our findings are in good agreement with data from differential scanning calorimetry (DSC) and transmission electron microscopy (TEM) experiments.

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Vorheriges Kapitel Visualization of Hydrogel Shrinkage Due to Ion Replacement by 27Al and 23Na Magnetic Resonance Imaging

Nächstes Kapitel Tracer Mobility in Aqueous Poly(N-isopropylacrylamide) Grafted Networks: Effect of Interactions and Permanent Crosslinks

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Titel: Sodium NMR Relaxation: A Versatile Non-invasive Tool for the Monitoring of Phase Transitions and the Estimation of Effective Pore Sizes of Supramolecular Hydrogels
verfasst von: M. Raue
A. Bernet
M. Küppers
S. Stapf
H.-W. Schmidt
B. Blümich
T. Mang
Verlag: Springer International Publishing
Buch: Intelligent Hydrogels
Print ISBN: 978-3-319-01682-5

Electronic ISBN: 978-3-319-01683-2

Copyright-Jahr: 2013
DOI: https://doi.org/10.1007/978-3-319-01683-2_4

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