Heterogeneity of network structures and water dynamics in κ-carrageenan gels probed by nanoparticle diffusometry
- de Kort, Daan W.
- Schuster, Erich
- Hoeben, Freek J.M.
- Barnes, Ryan
- Emondts, Meike
- Janssen, Henk M.
- Lorén, Niklas
- Han, Songi
- van As, Henk
- van Duynhoven, John P.M.
DOIAbstract
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 rela...
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