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Active turbulence in tubulin-based gels reveals a single intrinsic length scale governing flow geometry. This scale dictates vortex sizes and laminar flow patterns, offering insights into active matter self-organization.

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Area of Science:

  • Physics
  • Biophysics
  • Soft Matter Physics

Background:

  • Active matter systems exhibit self-organization and emergent behaviors.
  • Active nematics, composed of self-driven components, display orientational order and turbulent flow.
  • Understanding the fundamental length and time scales in active matter is crucial.

Purpose of the Study:

  • To identify and characterize the governing length scale in active turbulence within a tubulin-based active gel.
  • To investigate how this length scale influences flow geometry across different regimes.
  • To explore the role of topological defects in defining active matter length scales.

Main Methods:

  • Experimental investigation of a quasi-2D layer of tubulin-based active gel.
  • Analysis of vortex size distribution in active turbulence.
  • Observation of swirling laminar flows in contact with a lattice of circular domains.

Main Results:

  • A single intrinsic length scale determines the geometry of active flows.
  • This length scale is revealed by an exponential distribution of vortex sizes.
  • The same length scale acts as a cutoff for scale-free power law distributions in laminar flows.

Conclusions:

  • Active systems possess an intrinsic length scale that governs flow patterns.
  • Topological defects play a role in establishing this active length scale.
  • This finding provides a method to probe intrinsic scales in active matter and understand adaptation strategies.