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This work quantifies translational and rotational irreversibility in cyclically sheared colloidal suspensions across varying concentrations using a custom confocal-rheometer. By employing smooth and lobed colloidal particles, the study reveals flow-induced anisotropic effective diffusivities that are sensitive to particle concentration and morphology. The findings demonstrate that within the irreversible regime, shear-induced anisotropy is governed by interparticle friction and interlocking, which collectively drive mixing and enforce rotational isotropy.
Cyclically sheared colloidal suspensions exhibit flow-induced anisotropic effective diffusivities, with irreversibility driven by friction and interlocking that enforce rotational isotropy.
We investigate the translational and rotational dynamics of cyclically sheared suspensions over a broad range of particle concentrations. The transition to an irreversible state is studied using a custom confocal-rheometer and colloidal particles synthesized with chemically identical smooth and lobed surfaces. The particle trajectories and rotations are tracked in three dimensions to reveal enhanced effective diffusivities that exhibit flow induced anisotropy that depends on particle concentration and particle morphology. We show that within the irreversible state, the shear induced anisotropy is determined by interparticle friction and interlocking mechanisms that promote mixing and enforce rotational isotropy.