Estimating microstructural length scales in k-carrageenan hydrogels by PFG NMR nanoprobe diffusometry

Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

Abstract

We use PFG NMR to measure hindered self-diffusion of spherical, monodisperse diffusional nanoprobes in a polysaccharide network.
These nanoprobes have different diameters in the 1–10 nm range, but identical inert (PEG) surfaces. We use Johnson’s model of
particle self-diffusion in fibrous networks to estimate the polymer strand thickness and to obtain a measure for the network mesh
size. Johnson’s model takes into account the obstruction effect, and the degree of obstruction is independent from the arrangement
of the polymer strands at low polymer concentrations. Probe particles with different sizes provide consistent predictions of strand
thickness in this concentration regime. This allows us to infer a structural length scale close to the average mesh size of the polymer
network.
Original languageEnglish
Title of host publicationProceedings of the XIII International Conference on the Applications of Magnetic Resonance in Food Science
EditorsGisela Guthausen, John van Duynhoven
PublisherIM Publications
Pages73-76
ISBN (Electronic)9781906715243
DOIs
Publication statusPublished - 2016

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