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Heterogeneity of Network Structures and Water Dynamics in κ-Carrageenan Gels Probed by Nanoparticle Diffusometry.
Wageningen University, The Netherlands; TI-COAST, The Netherlands.
RISE - Research Institutes of Sweden, Bioscience and Materials, Agrifood and Bioscience.
TI-COAST, The Netherlands; SyMO-Chem B.V, The Netherlands.
University of California, USA.
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2018 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 34, no 37Article in journal (Refereed) Published
Abstract [en]

A set of functionalized nanoparticles (PEGylated dendrimers, d = 2.8-11 nm) was used to probe the structural heterogeneity in Na+/K+ induced κ-carrageenan gels. The self-diffusion behavior of these nanoparticles as observed by 1H pulsed-field gradient NMR, fluorescence recovery after photobleaching, and raster image correlation spectroscopy revealed a fast and a slow component, pointing toward microstructural heterogeneity in the gel network. The self-diffusion behavior of the faster nanoparticles could be modeled with obstruction by a coarse network (average mesh size <100 nm), while the slower-diffusing nanoparticles are trapped in a dense network (lower mesh size limit of 4.6 nm). Overhauser dynamic nuclear polarization-enhanced NMR relaxometry revealed a reduced local solvent water diffusivity near 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO)-labeled nanoparticles trapped in the dense network, showing that heterogeneity in the physical network is also reflected in heterogeneous self-diffusivity of water. The observed heterogeneity in mesh sizes and in water self-diffusivity is of interest for understanding and modeling of transport through and release of solutes from heterogeneous biopolymer gels.

Place, publisher, year, edition, pages
2018. Vol. 34, no 37
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Natural Sciences
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URN: urn:nbn:se:ri:diva-35143DOI: 10.1021/acs.langmuir.8b01052PubMedID: 30132676Scopus ID: 2-s2.0-85053514539OAI: oai:DiVA.org:ri-35143DiVA, id: diva2:1247111
Available from: 2018-09-11 Created: 2018-09-11 Last updated: 2019-06-25Bibliographically approved

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