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Mechanofluorescent Double Network Ionogels

  • 0State Key Laboratory of Artificial Intelligence for Material Science, School of Materials Science and Engineering, Beihang University, Beijing 100191, China.
Acs Applied Materials & Interfaces +

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August 11, 2025

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August 11, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

Researchers developed a novel mechanofluorescent double network (DN) ionogel. This material offers enhanced stability and tunable stress sensitivity for flexible fluorescent stress sensors, overcoming limitations of traditional hydrogels.

Area Of Science

  • Materials Science
  • Polymer Chemistry
  • Soft Matter Physics

Background

  • Mechanofluorescent gels change color with applied force, useful for alerts, crack visualization, and camouflage.
  • Existing hydrogel-based mechanofluorescent materials lack stability at high temperatures or in dry conditions due to water evaporation.
  • This instability limits their practical applications in harsh environments.

Purpose Of The Study

  • To develop a stable and highly stress-sensitive mechanofluorescent material.
  • To overcome the environmental instability of traditional mechanofluorescent hydrogels.
  • To create a versatile platform for flexible fluorescent stress sensors.

Main Methods

  • Fabrication of a mechanofluorescent double network (DN) ionogel.
  • The ionogel incorporates immobilized ionic liquids (IL) within two interpenetrating polymer networks.
  • Characterization of mechanical properties, stress sensitivity, and thermal/desiccation stability.

Main Results

  • The developed ionogel exhibits low volatility and excellent mass retention (<1.5% weight loss over 15 days at 80 °C).
  • The material demonstrates high stress sensitivity and reversible color changes in response to force.
  • Mechanical properties and mechanofluorescent sensitivity are tunable via ionic liquid and mechanofluorophore content.

Conclusions

  • The DN ionogel effectively overcomes the environmental instability of conventional mechanofluorescent gels.
  • This material offers a promising, stable, and tunable platform for flexible fluorescent stress sensors.
  • The findings pave the way for advanced applications requiring robust stress-responsive materials.

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