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Shear-induced gelation of self-yielding active networks
Physical Review Letters ( IF 8.385 ) Pub Date : 
David A. Gagnon; Claudia Dessi; John P. Berezney; Remi Boros; Daniel T. -N. Chen; Zvonimir Dogic; Daniel L. Blair

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 non-equilibrium networks. Experiments reveal a surprising non-monotonic 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 solid-like and yielded fluid-like elements of the network accurately describes the rheological measurements.
更新日期:2020-09-15

 

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