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Light-Actuated, Tunable Micromachines from Photo-Swellable Colloidal Ionogels.

Dezhou Cao1, Jingru Xu1, Dongqing He1,2

  • 1School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, Guangdong, 518055, China.

Small (Weinheim an Der Bergstrasse, Germany)
|May 30, 2025
PubMed
Summary

Light-responsive ionogels create tunable micromachines. These photo-swellable colloidal ionogels release ions under UV light, enabling water pumping and self-propelling micromotors with precise light control.

Keywords:
azobenzene‐based ionic liquidsdiffusiophoresislight‐actuated micromachinesphoto‐swellable colloidal ionogels

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Nanotechnology

Background:

  • Active colloids offer potential for stimuli-responsive micromachines.
  • Light control is crucial for fine-tuning micromachine performance and applications.

Purpose of the Study:

  • Develop light-actuated, tunable micromachines using photo-swellable colloidal ionogels.
  • Investigate the mechanisms of ion release, water pumping, and micromotor propulsion.

Main Methods:

  • Synthesized azobenzene-modified co-polymer microspheres infused with azobenzene-based ionic liquids (Azo-ILs).
  • Utilized UV/visible light to induce reversible cis-trans isomerization, controlling swelling and ion release.
  • Employed finite element and Brownian dynamics simulations to validate electrokinetic mechanisms.

Main Results:

  • UV light triggered rapid (milliseconds) ionogels swelling and Azo-IL release, leading to diffusiophoresis and diffusioosmosis.
  • Achieved isotropic ion release for water pumping (30 µm exclusion zones) and anisotropic release for micromotors (≈3 µm s⁻¹).
  • Demonstrated precise light intensity and azobenzene content modulation of micromachine interactions.

Conclusions:

  • Established a versatile platform for light-controlled micromachines based on photo-swellable colloidal ionogels.
  • Validated the electrokinetic principles governing ion-driven pumping and propulsion.
  • Highlighted potential applications in fluid manipulation, drug delivery, and soft robotics.