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Updated: Jun 17, 2026

Biophysical Characterization of Flagellar Motor Functions
06:08

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Published on: January 18, 2017

Geometric control of motility-induced phase separation.

Toler H Webb1, Helen S Ansell1, Daniel M Sussman1

  • 1Department of Physics, Emory University, Atlanta, GA 30322, USA. daniel.m.sussman@emory.edu.

Soft Matter
|June 16, 2026
PubMed
Summary

Curved surfaces control active matter self-organization. Varying torus shape shifts motility-induced phase separation (MIPS) clusters, revealing thermodynamic MIPS mechanisms in curved spaces.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Active Matter Physics

Background:

  • Curvature significantly impacts soft, active, and biological materials.
  • Motility-induced phase separation (MIPS) is a key non-equilibrium transition in active matter.

Purpose of the Study:

  • To investigate how geometric curvature influences MIPS.
  • To explore the use of curved spaces for understanding active matter dynamics.

Main Methods:

  • Studied active Brownian particles on a torus surface.
  • Varied the torus aspect ratio to induce geometric changes.
  • Analyzed the morphology and location of MIPS clusters.

Main Results:

  • Weak curvature robustly controls MIPS cluster location and morphology.
  • Torus aspect ratio changes drive MIPS cluster transitions from disk to band structures.
  • Cluster boundary geometries favor a thermodynamic over a simple kinetic MIPS model.

Conclusions:

  • Curved geometry offers precise control over active matter self-organization.
  • Curved spaces serve as sensitive platforms for probing fundamental MIPS mechanisms.
  • Results support a boundary-length-minimizing picture for MIPS in the large-particle limit.