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Active turbulence in a gas of self-assembled spinners

Supporting Information

  • Download Supporting Information (PDF)
  • Download Appendix (PDF)
  • Download Movie_S01 (AVI) - An example experimental video of nickel microparticles suspended at air–water interface and subjected to a uniaxial in-plane alternating magnetic field. The spinner phase with a large nonmagnetic tracer (diameter 500 ± 20 μm) is presented. The active particles can be either single or self-assemble into short-lived chains, which spontaneously rotate CW or CCW and create strong hydrodynamic flows. The alternating magnetic field amplitude was 2.7 mT, the frequency of the magnetic field 60 Hz, and the active particle number density in the spinner phase 3.5 ± 0.5 mm?2.
  • Download Movie_S02 (AVI) - Simulation animation of the dynamics of spinners (red) and passive tracers (blue). The parameters correspond to the results presented in Fig. 4 and listed in SI Appendix.
  • Download Movie_S03 (AVI) - A time series of calculated velocity, streamline, and vorticity fields from experimental measurements. Hydrodynamic flows are the strongest next to the spinners, which rotate in-plane in either direction. The parameters correspond to the results presented in Fig. 4.

Online Impact

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