Carbohydrate gel beads as model probes for quantifying non-ionic and ionic contributions behind the swelling of delignified plant fibers

Journal of Colloid and Interface Science
Rose-Marie Pernilla KarlssonLars Wågberg

Abstract

Macroscopic beads of water-based gels consisting of uncharged and partially charged β-(1,4)-d-glucan polymers were developed to be used as a novel model material for studying the water induced swelling of the delignified plant fiber walls. The gel beads were prepared by drop-wise precipitation of solutions of dissolving grade fibers carboxymethylated to different degrees. The internal structure was analyzed using Solid State Cross-Polarization Magic Angle Spinning Carbon-13 Nuclear Magnetic Resonance and Small Angle X-ray Scattering showing that the internal structure could be considered a homogeneous, non-crystalline and molecularly dispersed polymer network. When beads with different charge densities were equilibrated with aqueous solutions of different ionic strengths and/or pH, the change in water uptake followed the trends expected for weak polyelectrolyte gels and the trends found for cellulose-rich fibers. When dried and subsequently immersed in water the beads also showed an irreversible loss of swelling depending on the charge and type of counter-ion which is commonly also found for cellulose-rich fibers. Taken all these results together it is clear that the model cellulose-based beads constitute an excellent tool for ...Continue Reading

Citations

Jun 10, 2021·ACS Applied Materials & Interfaces·Yunus Can GorurLars Wågberg
Mar 1, 2019·Biomacromolecules·Rose-Marie Pernilla KarlssonLars Wågberg
Sep 29, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Rose-Marie Pernilla KarlssonLars Wågberg

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