Self-healing composite coating fabricated with a cystamine crosslinked cellulose nanocrystal stabilized Pickering emulsion

Xu, Guofan, Onyianta, Amaka J., Eloi, Jean-Charles, Harniman, Robert L., Laverock, Jude, Bond, Ian, Diejomaoh, Onajite Abafe, Koev, Todor T. ORCID:, Khimyak, Yaroslav Z. ORCID: and Eichhorn, Stephen J. (2024) Self-healing composite coating fabricated with a cystamine crosslinked cellulose nanocrystal stabilized Pickering emulsion. Biomacromolecules, 25 (2). pp. 715-728. ISSN 1525-7797

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A gelled Pickering emulsion system was fabricated by first stabilizing linseed oil droplets in water with dialdehyde cellulose nanocrystals (DACNCs) and then cross-linking with cystamine. Cross-linking of the DACNCs was shown to occur by a reaction between the amine groups on cystamine and the aldehyde groups on the CNCs, causing gelation of the nanocellulose suspension. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were used to characterize the cystamine-cross-linked CNCs (cysCNCs), demonstrating their presence. Transmission electron microscopy images evidenced that cross-linking between cysCNCs took place. This cross-linking was utilized in a linseed oil-in-water Pickering emulsion system, creating a novel gelled Pickering emulsion system. The rheological properties of both DACNC suspensions and nanocellulose-stabilized Pickering emulsions were monitored during the cross-linking reaction. Dynamic light scattering and confocal laser scanning microscopy (CLSM) of the Pickering emulsion before gelling imaged CNC-stabilized oil droplets along with isolated CNC rods and CNC clusters, which had not been adsorbed to the oil droplet surfaces. Atomic force microscopy imaging of the air-dried gelled Pickering emulsion also demonstrated the presence of free CNCs alongside the oil droplets and the cross-linked CNC network directly at the oil-water interface on the oil droplet surfaces. Finally, these gelled Pickering emulsions were mixed with poly(vinyl alcohol) solutions and fabricated into self-healing composite coating systems. These self-healing composite coatings were then scratched and viewed under both an optical microscope and a scanning electron microscope before and after self-healing. The linseed oil was demonstrated to leak into the scratches, healing the gap automatically and giving a practical approach for a variety of potential applications.

Item Type: Article
Additional Information: Funding information: The authors would like to thank the Engineering and Physical Sciences Research Council for funding the research (grant no. EP/V002651/1). TK is funded via a UKRI Future Leaders Fellowship awarded to Dr Matthew Wallace (MR/T044020/1). TK and YK are grateful to the UEA Faculty of Science NMR facility.
Uncontrolled Keywords: cystamine,cellulose nanocrystals,pickering emulsion,gel,poly(vinyl alcohol),self-healing,bioengineering,materials chemistry,polymers and plastics,biomaterials ,/dk/atira/pure/subjectarea/asjc/1500/1502
Faculty \ School: Faculty of Science > School of Pharmacy
UEA Research Groups: Faculty of Science > Research Groups > Pharmaceutical Materials and Soft Matter
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Depositing User: LivePure Connector
Date Deposited: 04 Mar 2024 18:37
Last Modified: 18 Mar 2024 13:30
DOI: 10.1021/acs.biomac.3c00915


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