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Updated: May 17, 2026

Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release
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A colloidal hydrogel with high structural stability for visualized moisture electricity generator.

Si Chen1, Shuang Chen1, Qin Zhang1

  • 1Polymeric and Soft Materials Laboratory, School of Chemistry and Life Science and Advanced Institute of Materials Science, Changchun University of Technology, Changchun 130012, China.

Journal of Colloid and Interface Science
|May 15, 2026
PubMed
Summary
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This study introduces a stable colloidal hydrogel for moisture electricity generators (MEGs). The novel hydrogel offers consistent power output and visual moisture indication, overcoming limitations of conventional designs.

Area of Science:

  • Materials Science
  • Energy Harvesting
  • Nanotechnology

Background:

  • Conventional hydrogel-based moisture electricity generators (MEGs) exhibit unstable electrical output due to hydrogel swelling/shrinkage.
  • This instability limits their practical application in harvesting energy from ambient moisture.

Purpose of the Study:

  • To develop a structurally stable colloidal hydrogel for enhanced MEG performance.
  • To create a visual indicator for moisture absorption and electricity generation using reversible color change.

Main Methods:

  • Fabrication of a colloidal hydrogel via precipitation polymerization of methacrylamide (MAm) and benzyl methacrylate (BzMA) in a water/dimethyl sulfoxide solvent system.
  • Characterization of the hydrogel's structural stability, anti-swelling/anti-shrinkage properties, and moisture-triggered reversible color change.
Keywords:
Colloidal hydrogelMoisture absorption-desorptionMoisture electricity generatorsStructural stabilityVisualized MEG

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  • Assembly and testing of the colloidal hydrogel-based MEG for electrochemical performance and long-term stability.

    • Main Results:

    • The colloidal hydrogel demonstrated excellent anti-swelling and anti-shrinkage properties, maintaining structural integrity in varying humidity.
    • The hydrogel exhibited reversible color change linked to moisture adsorption/desorption, providing a visual cue.
    • The developed MEG achieved an open-circuit voltage of 1.00 V, current density of 144.20 μA cm⁻², and stable output for over 50 hours at 90% RH.
    • Excellent cyclic stability was observed over ten moisture absorption-desorption cycles.

    Conclusions:

    • A structurally stable colloidal hydrogel was successfully fabricated, enabling efficient and reliable moisture electricity generation.
    • The visual color change provides a unique method for monitoring moisture levels and energy generation status.
    • This work presents a promising strategy for advancing stable and high-performance moisture electricity generators for powering small electronic devices.