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Updated: Jun 23, 2026

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Size-dependent light-driven effect observed for azo polymer colloidal spheres with different average diameters.

Junpeng Liu1, Yaning He, Xiaogong Wang

  • 1Department of Chemical Engineering, Laboratory for Advanced Materials, Tsinghua University, Beijing, P. R. China 100084.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 13, 2009
PubMed
Summary

Colloidal spheres made from azo polymers deform when exposed to polarized light, with size significantly impacting their shape and speed of deformation. Smaller spheres (200-300 nm) deform fastest and most extensively.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Colloidal spheres are versatile materials with applications in various fields.
  • Photoresponsive polymers offer dynamic control over material properties.
  • Understanding photoinduced deformation is crucial for designing advanced materials.

Purpose of the Study:

  • To synthesize azo polymer colloidal spheres with controlled diameters.
  • To investigate the photoinduced deformation behavior of these spheres under laser irradiation.
  • To elucidate the relationship between sphere size and deformation characteristics.

Main Methods:

  • Synthesis of colloidal spheres via hydrophobic aggregation of azo polymers (BP-AZ-CA, BP-AZ-NT).
  • Characterization using transmission electron microscopy, dynamic light scattering, and UV-vis spectroscopy.

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Last Updated: Jun 23, 2026

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  • Photoinduced deformation studies using a linearly polarized Ar+ laser beam.

    • Main Results:

    • Colloidal spheres deformed along the laser polarization direction upon irradiation.
    • Deformation rate and degree were strongly dependent on average sphere diameter.
    • Spheres with diameters of 200-300 nm exhibited the fastest and largest deformation.
    • BP-AZ-CA spheres showed faster deformation than BP-AZ-NT spheres of similar size.
    • Larger BP-AZ-CA spheres (510 nm) formed complex spindle-like or tadpole-like shapes.

    Conclusions:

    • Photoinduced deformation of azo polymer colloidal spheres is highly sensitive to their size.
    • Sphere size is a critical factor influencing deformation rate, extent, and resulting morphology.
    • Findings provide insights into the mechanisms of photoinduced colloid deformation.