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Programmable Photonic Response in pH-Responsive Block Copolymer Colloids.

Soohyun Ban1, Juyoung Lee1, Hayoung Kim1

  • 1School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.

ACS Applied Materials & Interfaces
|July 7, 2025
PubMed
Summary
This summary is machine-generated.

We developed pH-responsive polymer colloids with tunable structural color. By controlling polymer cross-linking and swelling, we achieved full-spectrum color modulation for stimuli-responsive photonic materials.

Keywords:
cross-linking densityionic hydration interactionsmicroparticlespH-responsive block copolymersstructural color

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Three-dimensionally ordered photonic colloids link nanoscale structure to optical properties.
  • Polymer-based colloids offer tunable characteristics for advanced materials.

Purpose of the Study:

  • To create pH-responsive photonic colloids with tunable structural color.
  • To investigate the relationship between internal morphology and optical response.
  • To establish a platform for stimuli-responsive photonic materials.

Main Methods:

  • Synthesized pH-responsive poly(styrene-block-2-vinylpyridine) (PS-b-P2VP) colloids.
  • Controlled P2VP domain cross-linking with 1,8-dibromooctane.
  • Tuned structural color via pH-induced swelling dynamics and anion interactions.

Main Results:

  • Achieved tunable structural color from violet to red by controlling cross-linking density.
  • Demonstrated that anion hydration energy dictates water uptake and color shift.
  • Showcased continuous, full-spectrum color modulation through systematic parameter tuning.
  • Enabled real-time optical tracking of internal structural changes at the single-particle level.

Conclusions:

  • PS-b-P2VP colloids provide a versatile platform for stimuli-responsive photonic materials.
  • The system allows for programmable color output based on environmental stimuli.
  • This work enables precise control over nanoscale morphology for macroscale optical effects.