Characterizing sliding and rolling contacts between single particles.

ABSTRACT: Contacts between particles in dense, sheared suspensions are believed to underpin much of their rheology. Roughness and adhesion are known to constrain the relative motion of particles, and thus globally affect the shear response, but an experimental description of how they microscopically influence the transmission of forces and relative displacements within contacts is lacking. Here, we show that an innovative colloidal-probe atomic force microscopy technique allows the simultaneous measurement of normal and tangential forces exchanged between tailored surfaces and microparticles while tracking their relative sliding and rolling, unlocking the direct measurement of coefficients of rolling friction, as well as of sliding friction. We demonstrate that, in the presence of sufficient tractio

SUBMITTER: Scherrer S 

PROVIDER: S-EPMC11912374 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature