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Light-directed movement of polymer microstructures.

Trent R Northen1, Neal W Woodbury

  • 1Department of Chemistry and Biochemistry, Arizona State University, and Biodesign Institute at Arizona State University, Tempe, Arizona 85287-1604, USA. tn@asu.edu

Langmuir : the ACS Journal of Surfaces and Colloids
|May 18, 2005
PubMed
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Researchers demonstrated light-directed motion in polymer microstructures. Asymmetric light caused specific shrinkage, enabling controlled movement for applications in micro-robotics and fluidics.

Area of Science:

  • Photochemistry
  • Polymer Science
  • Microfluidics
  • Microrobotics

Background:

  • Light can induce photochemical reactions altering material properties.
  • Controlling microstructures with light offers potential for advanced applications.
  • Polymer microstructures can exhibit significant volume changes upon chemical modification.

Purpose of the Study:

  • To investigate light-induced motion in modified polymer microstructures.
  • To explore the relationship between asymmetric illumination and directed movement.
  • To assess the potential of this system for micromechanical and microfluidic applications.

Main Methods:

  • Fabrication of swellable poly(2-hydroxyethyl methacrylate) microstructures via photopolymerization.

Related Experiment Videos

  • Surface amination with glycine and protection using a photolabile group (4-nitroveratryloxycarbanyl, NVOC).
  • Asymmetric and symmetric 365 nm laser illumination of cone-shaped microstructures in N,N'-dimethylformamide.

    • Main Results:

    • NVOC addition increased microstructure volume by over 10%.
    • Asymmetric illumination induced >4% polymer shrinkage at the cone base, resulting in 1 mm/s tip velocity.
    • Symmetric illumination caused solvent displacement with velocities >0.01 mm/s.

    Conclusions:

    • Asymmetric light can precisely control the motion of polymer microstructures.
    • The system demonstrates potential for light-directed micromechanical systems.
    • Applications include optical control of microfluidics and light-activated chemical delivery.