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Active fluids have applications in micromixing, but little is known about themixing kinematics of systems with spatiotemporally-varying activity. Toinvestigate, UV-activated caged ATP was used to activate controlled regions ofmicrotubule-kinesin active fluid and the mixing process was observed withfluorescent tracers and molecular dyes. At low P\'eclet numbers (diffusivetransport), the active-inactive interface progressed toward the inactive areain a diffusion-like manner that was described by a simple model combiningdiffusion with Michaelis-Menten kinetics. At high P\'eclet numbers (convectivetransport), the active-inactive interface progressed in a superdiffusion-likemanner that was qualitatively captured by an active-fluid hydrodynamic modelcoupled to ATP transport. Results showed that active fluid mixing involvescomplex coupling between distribution of active stress and active transport ofATP and reduces mixing time for suspended components with decreased impact ofinitial component distribution. This work will inform application of activefluids to promote micromixing in microfluidic devices.

Self-mixing in microtubule-kinesin active fluid from nonuniform to uniform distribution of activity