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Ambient-Dried Silica Xerogels with Enhanced Strength and Thermal Insulation via Calcium Ion-Glycerol Synergistic Crosslinking

  • 0Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, National Engineering Research Center of Biomaterials, Nanjing Forestry University, Nanjing 210037, China.
Gels (basel, Switzerland) +

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June 25, 2025

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June 25, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

This study enhances silica xerogels using calcium-glycerol synergy for improved mechanical strength and thermal insulation. The novel ambient-pressure method creates robust materials for demanding applications.

Area Of Science

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background

  • Silica xerogels offer high porosity but lack mechanical strength for advanced uses.
  • Improving xerogel properties is crucial for applications in building envelopes and aerospace.

Purpose Of The Study

  • To develop robust silica xerogels with enhanced mechanical and thermal insulation properties.
  • To investigate the synergistic effects of calcium and glycerol in an ambient-pressure sol-gel process.

Main Methods

  • Ambient-pressure sol-gel synthesis incorporating controlled calcium (Ca2+) and glycerol.
  • Physicochemical analyses including mechanical testing and porosity measurements.
  • Thermal insulation evaluation under high-temperature conditions.

Main Results

  • Optimal Ca2+ incorporation (6 wt.%) significantly enhanced gelation kinetics and network formation.
  • Achieved exceptional compressive strength (30.8 MPa) and maintained mesoporosity (50-90 nm).
  • Demonstrated outstanding thermal insulation with a 220 °C temperature differential.

Conclusions

  • Calcium-glycerol synergy provides a scalable, energy-efficient method for producing high-performance silica xerogels.
  • The approach enhances mechanical robustness via Ca2+-induced reinforcement and glycerol-mediated stress relief.
  • These improved silica xerogels show significant potential for thermal insulation in construction and aerospace.

Keywords:

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