Octylamine-modified cellulose nanocrystal-enhanced stabilization of Pickering emulsions for self-healing composite coatings

Xu, Guofan, Nigmatullin, Rinat, Koev, Todor T., Khimyak, Yaroslav Z., Bond, Ian P. and Eichhorn, Stephen J. (2022) Octylamine-modified cellulose nanocrystal-enhanced stabilization of Pickering emulsions for self-healing composite coatings. ACS Applied Materials & Interfaces, 14 (10). 12722–12733. ISSN 1944-8244

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Abstract

Linseed oil-in-water Pickering emulsions are stabilized by both sulfated CNCs (sCNCs) and octylamine-modified CNCs (oCNCs). oCNCs with hydrophobic moieties grafted on the surfaces of otherwise intact nanocrystals provided emulsions exhibiting stronger resistance to creaming of oil droplets, compared with unmodified sCNCs. sCNCs were not able to completely stabilize linseed oil in water at low CNC concentrations while oCNCs provided emulsions with no unemulsified oil residue at the same concentrations. Oil droplets in oCNC emulsions were smaller than those in samples stabilized by sCNCs, corresponding with an increased hydrophobicity of oCNCs. Cryo-SEM imaging of stabilized droplets demonstrated the formation of a CNC network at the oil–water interface, protecting the oil droplets from coalescence even after compaction under centrifugal force. These oil droplets, protected by a stabilized CNC network, were dispersed in a water-based commercial varnish, to generate a composite coating. Scratches made on these coatings self-healed as a result of the reaction of the linseed oil bled from the damaged droplets with oxygen. The leakage and drying of the linseed oil at the location of the scratches happened without intervention and was accelerated by the application of heat.

Item Type: Article
Additional Information: Acknowledgements: S.J.E. would like to thank the Engineering and Physical Sciences Research Council for funding (Grant No. V002651/1). T.T.K. acknowledges the support of the UKRI Future Leaders Fellowship awarded to M. Wallace (MR/T044020/1). We are grateful to the UEA’s Faculty of Science NMR facility.
Uncontrolled Keywords: cellulose nanocrystals (cncs),octylamine,pickering emulsion,self-healing,coatings,linseed oil,cellulose nanocrystals,materials science(all) ,/dk/atira/pure/subjectarea/asjc/2500
Faculty \ School: Faculty of Science > School of Pharmacy
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 11 Mar 2022 15:30
Last Modified: 24 May 2022 14:52
URI: https://ueaeprints.uea.ac.uk/id/eprint/83998
DOI: 10.1021/acsami.2c01324

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