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Title

Determination of oxygen permeability in acrylic-based hydrogels by proton NMR spectroscopy and imaging

AuthorsCompañ, Vicente; Mollá, Sergio; Vallejos, Saúl; García, Félix; García, José Miguel; Guzmán, Julio ; Garrido, Leoncio
Keywordsacrylic hydrogels
oxygen permeability
paramagne­tism
proton NMR imaging
Issue Date2014
PublisherJohn Wiley & Sons
CitationMacromolecular Chemistry and Physics 215: 624- 637 (2014)
AbstractPolymer network membranes with a high capacity for water absorption are obtained by radical polymerization of N-[2-(2-hydroxyethoxy)ethyl]methacrylamide (HEEMAM). The permeability, solubility, and diffusion coefficients of oxygen in hydrogels are determined using nuclear magnetic resonance (NMR) methods based on the paramagnetic effect of dissolved oxygen gas on the proton spin-lattice relaxation times of water, and the results are compared with those obtained with electrochemical procedures. The results of NMR measurements of oxygen transport coefficients in distilled water show excellent agreement with corresponding literature values. The results of the potentiostatic and NMR oxygen transport measurements in hydrogels are in reasonable agreement and support the viability of the NMR method. An NMR method to determine the transport coefficients of oxygen in hydrogels is proposed. The method exploits the paramagnetic properties of the oxygen gas and its effect on the water proton NMR spin-lattice relaxation time to map the spatial and temporal concentrations of dissolved oxygen in hydrated gels. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
URIhttp://hdl.handle.net/10261/97424
DOI10.1002/macp.201300730
Identifiersdoi: 10.1002/macp.201300730
issn: 1022-1352
e-issn: 1521-3935
Appears in Collections:(ICTP) Artículos
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