Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.018003
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Funding
- Gates Millennium Scholars fellowship
- National Science Foundation (NSF) Graduate Research Fellowship [DGE-1144469]
- NSF Grant [CBET 1437570]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1437570] Funding Source: National Science Foundation
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The current understanding is that the non-Newtonian rheology of active matter suspensions is governed by fluid-mediated hydrodynamic interactions associated with active self-propulsion. Here we discover an additional contribution to the suspension shear stress that predicts both thickening and thinning behavior, even when there is no nematic ordering of the microswimmers with the imposed flow. A simple micromechanical model of active Brownian particles in homogeneous shear flow reveals the existence of off-diagonal shear components in the swim stress tensor, which are independent of hydrodynamic interactions and fluid disturbances. Theoretical predictions from our model are consistent with existing experimental measurements of the shear viscosity of active suspensions, but also suggest new behavior not predicted by conventional models.
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