Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.178003
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Funding
- Templeton Foundation [57392]
- Georgetown University
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0019733]
- [NSF-MRSEC-2011486]
- U.S. Department of Energy (DOE) [DE-SC0019733] Funding Source: U.S. Department of Energy (DOE)
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An enticing feature of active materials is the possibility of controlling macroscale rheological properties through the activity of the microscopic constituents. Using a unique combination of microscopy and rheology we study three dimensional microtubule-based active materials whose autonomous flows are powered by a continually rearranging connected network. We quantify the relationship between the microscopic dynamics and the bulk mechanical properties of these nonequilibrium networks. Experiments reveal a surprising nonmonotonic viscosity that strongly depends on the relative magnitude of the rate of internally generated activity and the externally applied shear. A simple two-state mechanical model that accounts for both the solidlike and yielded fluidlike elements of the network accurately describes the theological measurements.
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