Particle-wall tribology of slippery hydrogel particle suspensions

Shewan, Heather M., Stokes, Jason R. and Cloitre, Michel (2017) Particle-wall tribology of slippery hydrogel particle suspensions. Soft Matter, 13 10: 2099-2106. doi:10.1039/c6sm01775d

Author Shewan, Heather M.
Stokes, Jason R.
Cloitre, Michel
Title Particle-wall tribology of slippery hydrogel particle suspensions
Journal name Soft Matter   Check publisher's open access policy
ISSN 1744-6848
Publication date 2017-03-14
Year available 2017
Sub-type Article (original research)
DOI 10.1039/c6sm01775d
Open Access Status Not yet assessed
Volume 13
Issue 10
Start page 2099
End page 2106
Total pages 8
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Abstract Slip is an important phenomenon that occurs during the flow of yield stress fluids like soft materials and pastes. Densely packed suspensions of hydrogel microparticles are used to show that slip is governed by the tribological interactions occurring between the samples and shearing surfaces. Both attractive/repulsive interactions between the dispersed particles and surface, as well as the viscoelasticity of the suspension, are found to play key roles in slip occurring within rheometric flows. We specifically discover that for two completely different sets of microgels, the sliding stress at which slip occurs scales with both the modulus of the particles and the bulk suspension modulus. This suggests that hysteresis losses within the viscoelastic particles contribute to friction forces and thus slip at the particle-surface tribo-contact. It is also found that slip during large amplitude oscillatory shear and steady shear flows share the same generic features.
Keyword Hard-Sphere Suspensions
Concentrated Suspensions
Microgel Suspensions
Shear Viscosity
Screw Extrusion
Complex Fluids
Soft Materials
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID DP150104147
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
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