Skip to Main content Skip to Navigation
Journal articles

Kinetic aspects of the adsorption of xyloglucan onto cellulose nanocrystals

Abstract : In this work, the adsorption of a neutral flexible polysaccharide, xyloglucan (XG), onto thin cellulose nanocrystal (CNC) surfaces has been investigated to get more insight into the CNC-XG association. Gold-coated quartz crystals were spin-coated with one layer of CNC, and XG adsorption was monitored in situ using a quartz crystal microbalance with dissipation (QCM-D). The adsorption of XG under flow at different concentrations did not result in the same surface concentration, which evidenced a kinetically controlled process. In an attempt to describe the binding of XG to CNCs, adsorption data were fitted to a kinetic model comprising a contribution from XG adsorption onto uncovered CNC surfaces and a contribution from XG adsorption after rearrangement. Kinetic studies evidenced the presence of two adsorption regimes as a function of XG concentration. For low XG concentrations, the kinetic constant for chain rearrangement is comparable to the kinetic constant for adsorption. This fact implies a rearrangement and alignment of XG molecules on CNCs. Differently, for higher XG concentrations, the kinetic constant related to the conformational rearrangement decreases, indicating that XG molecules have no time to laterally rearrange before new XG molecules adsorb.
Document type :
Journal articles
Complete list of metadata

https://hal.inrae.fr/hal-02637726
Contributor : Migration Prodinra <>
Submitted on : Wednesday, May 27, 2020 - 11:59:31 PM
Last modification on : Friday, May 21, 2021 - 3:40:27 AM

Identifiers

Collections

Citation

Ana Villares, Céline Moreau, Abir Dammak, Isabelle Capron, Bernard Cathala. Kinetic aspects of the adsorption of xyloglucan onto cellulose nanocrystals. Soft Matter, Royal Society of Chemistry, 2015, 11 (32), pp.6472 - 6481. ⟨10.1039/c5sm01413a⟩. ⟨hal-02637726⟩

Share

Metrics

Record views

19