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Related Experiment Video

Updated: Jun 13, 2026

Growing Protein Crystals with Distinct Dimensions Using Automated Crystallization Coupled with In Situ Dynamic Light Scattering
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Physically controlled cross-linking in gelated crystalline colloidal array photonic crystals.

Cheng Chen1, Yihua Zhu, Hua Bao

  • 1Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.

ACS Applied Materials & Interfaces
|April 20, 2010
PubMed
Summary

We developed a novel gelated crystalline colloidal array (GCCA) using poly(vinyl alcohol) (PVA) hydrogel. This photonic crystal material is tunable, reversible, and shows potential for pH sensing applications.

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Last Updated: Jun 13, 2026

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Crystalline colloidal arrays (CCAs) are photonic crystals with tunable properties.
  • Poly(vinyl alcohol) (PVA) hydrogels offer biocompatibility and tunable mechanical properties.
  • Developing stable, shapeable, and functional photonic materials remains a key challenge.

Purpose of the Study:

  • To create a stable, shapeable, and tunable photonic crystal material.
  • To investigate the sol-gel reversibility and rehydration stability of the material.
  • To explore the pH sensing capabilities of functionalized PVA-based CCAs.

Main Methods:

  • Preparation of PVA hydrogel via a chilling-thawing method.
  • Physical immobilization of CCA within the PVA hydrogel matrix.
  • Functionalization of PVA hydrogel with Chitosan (CS) for sensing applications.

Main Results:

  • Successfully fabricated a gelated crystalline colloidal array (GCCA) with tunable visible light diffraction.
  • Demonstrated sol-gel reversibility upon temperature cycling and long-term storage stability after rehydration.
  • Observed pH sensing behavior in PVA/CS GCCA, with sensitivity correlating to CS concentration.

Conclusions:

  • The developed PVA-based GCCA is a stable, shapeable, and tunable photonic crystal.
  • The material exhibits reversible sol-gel behavior and retains its optical properties after rehydration.
  • PVA/CS GCCA shows promise as a pH-responsive material for sensing applications.