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Nanotribology of hydrogels with similar stiffness but different polymer and crosslinker concentrations
University of Western Australia, Australia.
University of Western Australia, Australia.
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design. KTH Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-8935-8070
University of Western Australia, Australia.
2020 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 563, p. 347-353Article in journal (Refereed) Published
Abstract [en]

Hypothesis: The stiffness has been found to regulate hydrogel performances and applications. However, the key interfacial properties of hydrogels, like friction and adhesion are not controlled by the stiffness, but are altered by the structure and composition of hydrogels, like polymer volume fraction and crosslinking degree. Experiments: Colloidal probe atomic force microscopy has been use to investigate the relationship between tribological properties (friction and adhesion) and composition of hydrogels with similar stiffness, but different polymer volume fractions and crosslinking degrees. Findings: The interfacial normal and lateral (friction) forces of hydrogels are not directly correlated to the stiffness, but altered by the hydrogel structure and composition. For normal force measurements, the adhesion increases with polymer volume fraction but decreases with crosslinking degree. For lateral force measurements, friction increases with polymer volume fraction, but decreases with crosslinking degree. In the low normal force regime, friction is mainly adhesion-controlled and increases significantly with the adhesion and polymer volume fraction. In the high normal force regime, friction is predominantly load-controlled and shows slow increase with normal force. 

Place, publisher, year, edition, pages
Academic Press Inc. , 2020. Vol. 563, p. 347-353
Keywords [en]
Adhesion, Colloidal probe atomic force microscopy, Friction, Hydrogel, Atomic force microscopy, Force measurement, Hydrogels, Nanotribology, Polymers, Probes, Stiffness, Volume fraction, Colloidal probe atomic force microscopies, Cross-linking degree, Crosslinker concentration, Hydrogel structure, Interfacial property, Normal forces, Polymer volume fraction, Tribological properties, Crosslinking, n, n' methylenebisacrylamide, polyacrylamide gel, Article, chemical composition, chemical structure, colloid, concentration (parameter), correlation coefficient, cross linking, force, nanotechnology, priority journal, rigidity, shear strength, volume
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-43390DOI: 10.1016/j.jcis.2019.12.045Scopus ID: 2-s2.0-85076841751OAI: oai:DiVA.org:ri-43390DiVA, id: diva2:1390368
Available from: 2020-01-31 Created: 2020-01-31 Last updated: 2020-01-31Bibliographically approved

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Rutland, Mark W.

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