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Dynamic Colloidal Molecules Maneuvered by Light-Controlled Janus Micromotors.

Yirong Gao1, Fangzhi Mou1, Yizheng Feng1

  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology , Wuhan 430070, China.

ACS Applied Materials & Interfaces
|June 13, 2017
PubMed
Summary

Researchers created dynamic colloidal molecules that self-assemble and disassemble using light-activated Janus micromotors. This breakthrough enables precise control over microstructures for potential microdevice fabrication.

Keywords:
Janus micromotorscolloidal moleculeslight-controlled motionmicrolens arraysreversible assembly

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Soft Matter Physics

Background:

  • Colloidal particles are fundamental building blocks in various scientific disciplines.
  • Autonomous movement and controlled assembly of microstructures remain significant challenges.
  • Janus micromotors offer promising platforms for directed motion and manipulation at the microscale.

Purpose of the Study:

  • To propose and demonstrate a dynamic colloidal molecule capable of autonomous movement.
  • To achieve swift, reversible, and in-place assembly and dissociation of colloidal molecules with high accuracy.
  • To explore the potential of light-controlled interactions for microdevice fabrication.

Main Methods:

  • Utilizing a titanium dioxide/platinum (TiO2/Pt) Janus micromotor for light-driven propulsion.
  • Employing light-switchable electrostatic interactions to capture and assemble colloidal particles.
  • Regulating time-dependent UV light intensity to control assembly, stabilization, and stop-and-go motion.
  • Dissociating colloidal molecules by deactivating light irradiation.

Main Results:

  • Successfully demonstrated the formation of dynamic colloidal molecules with precisely controlled configurations.
  • Achieved autonomous movement and reversible, in-place assembly/dissociation of these colloidal molecules.
  • Showcased the ability to capture and assemble colloidal particles sequentially using the micromotor.
  • Verified that UV light intensity precisely controls the dynamic colloidal molecules' motion and stability.

Conclusions:

  • The developed strategy enables the creation of dynamic colloidal molecules with light-controlled motion and assembly.
  • This approach is versatile and applicable to various charged colloidal particles.
  • The findings suggest a novel pathway for the rapid, reversible, in-place construction of functional microdevices, such as microlens arrays.