Effect of contact geometry on the friction of acrylamide hydrogels with different surface structures

• Published in: Friction Vol. 10; no. 3; pp. 360 - 373
• Main Authors: Liu, Wenrui, Simič, Rok, Liu, Yuhong, Spencer, Nicholas D.
• Format: Journal Article
• Language: English
• Published: Beijing Tsinghua University Press 01.03.2022; Springer Nature B.V; State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China; Laboratory for Surface Science and Technology,Department of Materials,ETH Zurich,8093 Zurich,Switzerland%Laboratory for Surface Science and Technology,Department of Materials,ETH Zurich,8093 Zurich,Switzerland%State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China
• Subjects: Acrylamide; Coefficient of friction; Configurations; Contact pressure; Contact stresses; Corrosion and Coatings; Crosslinking; Engineering; Friction; Friction reduction; Geometry; Hydrogels; Mechanical Engineering; Nanotechnology; Normalizing; Physical Chemistry; Polyacrylamide; Research Article; Shear stress; Sliding; Surfaces and Interfaces; Thin Films; Tribology; Water supply; hydrogels; friction coefficient (COF); superlubricity; aqueous lubrication; contact geometry

Polyacrylamide (PAAm) hydrogels with brush-covered or crosslinked surfaces were produced and their tribological behavior was studied over a wide range of sliding speeds for two different contact geometries: sphere-on-flat and flat-pin-on-flat. Irrespective of the contact geometry, the brushy hydroge...