Friction of Poroelastic Contacts with Thin Hydrogel Films

Langmuir : the ACS Journal of Surfaces and Colloids
J DelavoipièreAntoine Chateauminois

Abstract

We report on the frictional behavior of thin poly(dimethylacrylamide) hydrogel films grafted on glass substrates in sliding contact with a glass spherical probe. Friction experiments are carried out at various velocities and normal loads applied with the contact fully immersed in water. In addition to friction force measurements, a novel optical setup is designed to image the shape of the contact under steady-state sliding. The velocity dependence of both friction force Ft and contact shape is found to be controlled by a Péclet number, Pe, defined as the ratio of the time τ needed to drain the water out of the contact region to a contact time a/ v, where v is the sliding velocity and a is the contact radius. When Pe < 1, the equilibrium circular contact achieved under static normal indentation remains unchanged during sliding. Conversely, for Pe > 1, a decrease in the contact area is observed together with the development of a contact asymmetry when the sliding velocity is increased. A maximum in Ft is also observed at Pe ≈1. These experimental observations are discussed in the light of a poroelastic contact model based on a thin-film approximation. This model indicates that the observed changes in contact geometry are due to t...Continue Reading

References

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Citations

Jul 1, 2020·Soft Matter·Lola CiapaAntoine Chateauminois
Sep 26, 2019·Soft Matter·Shabnam Z BonyadiAlison C Dunn
Nov 28, 2020·Journal of the Mechanical Behavior of Biomedical Materials·Shabnam Z BonyadiAlison C Dunn
Aug 2, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Yuki A MeierRok Simic
Aug 14, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Pierre VialarCarlos Drummond
Oct 3, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Koki ShinomiyaYoshimune Nonomura
Jul 11, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Karl G JohannesMark E Rentschler
Aug 13, 2021·Journal of Biomechanical Engineering·Brandon K ZimmermanGerard A Ateshian

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