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Light-Programmable Assemblies of Isotropic Micromotors.

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Researchers developed light-controlled isotropic micromotors that can form tunable nonequilibrium assemblies. These active micro-machines offer enhanced steerability for advanced functional microdevices.

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Area of Science:

  • Soft Matter Physics
  • Active Matter
  • Photocatalysis

Background:

  • Nonequilibrium assemblies are crucial for advanced materials but often lack precise control.
  • Existing micro/nanomotors typically rely on inherent asymmetry, leading to random rotations that hinder local interactions and steerability.

Purpose of the Study:

  • To demonstrate light-programmable interactions and tunable assembly formation using isotropic photocatalytic micromotors.
  • To overcome limitations of steerability in active matter systems.

Main Methods:

  • Utilized isotropic photocatalytic micromotors exhibiting persistent phoretic flow independent of Brownian rotations.
  • Applied directional incident light to control light-programmable local interactions (attraction/repulsion/alignment).
  • Demonstrated the organization of micromotors into various nonequilibrium assemblies and patterned structures.

Main Results:

  • Achieved light-programmable interactions, reversibly switching between attraction and repulsion/alignment.
  • Organized micromotors into tunable nonequilibrium assemblies: apolar solids (colloidal crystals), polar liquids (phototactic streams), and polar solids (phototactic crystals).
  • Demonstrated the ability to 'cut' assemblies into predesigned patterns using superimposed light edges.

Conclusions:

  • Isotropic photocatalytic micromotors offer unprecedented light-based control over active matter assembly.
  • This approach facilitates the development of steerable nonequilibrium assemblies and functional microdevices.
  • Enables precise patterning and dynamic reconfiguration of active matter systems.