A Eutectic-interface Engineered Al₂TiO₅ Nanofibrous Aerogel for Superinsulation Under Extreme Conditions

Area of Science:

• Materials Science
• Nanotechnology
• Ceramic Engineering

Background:

• Ceramic aerogels are sought after for extreme temperature insulation but face a trade-off between thermal resistance and mechanical stability.
• Existing methods often require high temperatures, limiting scalability and material properties.

Purpose of the Study:

• To develop a ceramic aerogel that is both a thermal super-insulator and mechanically robust at extreme temperatures.
• To overcome the inherent trade-off between thermal resistance and thermomechanical stability in ceramic materials.

Main Methods:

• A eutectic-interface engineering strategy was employed to create a 3D, elastic aluminum titanate (Al2TiO5) nanofibrous aerogel.
• A scalable, fully aqueous roll-to-roll electrospinning process was utilized for low-temperature synthesis.
• The synthesis resulted in a co-continuous Al2O3-TiO2 eutectic architecture.

Main Results:

• The aerogel exhibits ultralow thermal conductivity (0.033 W·m⁻¹·K⁻¹ at 25°C and 0.103 W·m⁻¹·K⁻¹ at 1000°C).
• It demonstrates robustness against direct flame at 1300°C without structural failure.
• The material shows excellent elastic recovery (up to 90% after 50% strain compression).

Conclusions:

• The developed elastic ceramic aerogel offers a viable and sustainable solution for mass production.
• Eutectic interfaces are key to achieving superior thermal insulation and thermal stability.
• This work presents a new paradigm for transforming brittle eutectic oxides into high-performance thermal super-insulators for demanding applications.