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Double-Network Hydrogels via Hybrid Strategies: Potential in Large-Scale Manufacturing for Colorimetric Indicator.

Ningli An1, Jiwen Liu1, Wentao Zhou1

  • 1Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an 710054, China.

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|September 26, 2025
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Summary
This summary is machine-generated.

This study developed dual-network composite hydrogels for colorimetric indicators. The enhanced sodium alginate hydrogels show improved mechanical strength and ammonia detection capabilities, paving the way for industrial applications.

Keywords:
PVAagarcolorimetricdouble-networkgelatinsodium alginate

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Area of Science:

  • Materials Science
  • Biotechnology
  • Chemical Engineering

Background:

  • Biological hydrogels offer porous structures ideal for colorimetric indicators but suffer from poor mechanical properties, limiting industrial use.
  • Developing robust hydrogel supports is crucial for advancing colorimetric sensing technologies.
  • Composite hydrogels present a promising avenue to overcome the limitations of single-component biomass hydrogels.

Purpose of the Study:

  • To synthesize and characterize dual-network composite hydrogels (Agar/Gelatin, Sodium Alginate/Agar, Sodium Alginate/Poly (vinyl alcohol), and Sodium Alginate/Gelatin) for improved performance.
  • To investigate the impact of dual-network structures on mechanical properties and ammonia gas response.
  • To evaluate the potential of these composite hydrogels as solid supports for colorimetric indicators.

Main Methods:

  • Hybrid synthesis strategies were employed to create four distinct dual-network composite hydrogels.
  • Microscopy and Fourier transform infrared spectroscopy (FTIR) were used for material characterization.
  • Mechanical testing (tensile strength, toughness) and ammonia response evaluation (color difference threshold) were performed.

Main Results:

  • Incorporating Sodium Alginate (SA) into hydrogel matrices significantly enhanced mechanical properties and ammonia response via a secondary topological network.
  • Calcium ion cross-linking effectively regulated the interpenetrating double network structure.
  • SA/PVA hydrogels demonstrated a color difference threshold of 10 for ammonia detection, suitable for rapid sensing.
  • SA/Gel hydrogels exhibited superior mechanical robustness, with 11x tensile strength and 80x toughness compared to single gels.

Conclusions:

  • Dual-network composite hydrogels, particularly those incorporating Sodium Alginate, offer enhanced mechanical strength and sensing capabilities for colorimetric applications.
  • The SA/Gel composite hydrogel's exceptional mechanical properties make it highly suitable for large-scale manufacturing of colorimetric indicators.
  • These advanced hydrogels show significant promise for developing reliable and industrially viable ammonia detection systems.