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The Impact of Surface Charges of Carboxylated Cellulose Nanofibrils on the Water Motions in Hydrated Films
Stockholm University, Sweden; Aalto University, Finland.
RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign. Stockholm University, Sweden.ORCID-id: 0000-0002-9663-7705
Aalto University, Finland.
Aalto University, Finland.
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2022 (Engelska)Ingår i: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 23, nr 8, s. 3104-3115Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Cellulose nanofibrils (CNFs) with carboxylated surface ligands are a class of materials with tunable surface functionality, good mechanical properties, and bio-/environmental friendliness. They have been used in many applications as scaffold, reinforcing, or functional materials, where the interaction between adsorbed moisture and the CNF could lead to different properties and structures and become critical to the performance of the materials. In this work, we exploited multiple experimental methods to study the water movement in hydrated films made of carboxylated CNFs prepared by TEMPO oxidation with two different surface charges of 600 and 1550 μmol·g-1. A combination of quartz crystal microbalance with dissipation (QCM-D) and small-angle X-ray scattering (SAXS) shows that both the surface charge of a single fibril and the films' network structure contribute to the moisture uptake. The films with 1550 μmol·g-1 surface charges take up twice the amount of moisture per unit mass, leading to the formation of nanostructures with an average radius of gyration of 2.1 nm. Via the nondestructive quasi-elastic neutron scattering (QENS), a faster motion is explained as a localized movement of water molecules inside confined spheres, and a slow diffusive motion is found with the diffusion coefficient close to bulk water at room temperature via a random jump diffusion model and regardless of the surface charge in films made from CNFs.

Ort, förlag, år, upplaga, sidor
NLM (Medline) , 2022. Vol. 23, nr 8, s. 3104-3115
Nyckelord [en]
carboxylic acid, cellulose, nanofiber, water, chemistry, quartz crystal microbalance, small angle scattering, X ray diffraction, Carboxylic Acids, Nanofibers, Quartz Crystal Microbalance Techniques, Scattering, Small Angle, X-Ray Diffraction
Nationell ämneskategori
Biokemi och molekylärbiologi
Identifikatorer
URN: urn:nbn:se:ri:diva-60058DOI: 10.1021/acs.biomac.1c01517Scopus ID: 2-s2.0-85135599185OAI: oai:DiVA.org:ri-60058DiVA, id: diva2:1699984
Tillgänglig från: 2022-09-29 Skapad: 2022-09-29 Senast uppdaterad: 2023-06-08Bibliografiskt granskad

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Yu, Shun

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