Thermal Insulation Nanofiber Aerogels: A Journey from Structure Construction to Multifunctionalization

Area of Science:

• Materials Science
• Nanotechnology
• Thermal Engineering

Background:

• Conventional aerogels possess excellent thermal insulation but suffer from brittleness, limiting their use in demanding environments.
• Nanofiber aerogels (NFAs) utilize high-aspect-ratio fibers to enhance flexibility and mechanical robustness.
• Advanced structural design of NFAs is crucial for overcoming the limitations of traditional aerogels.

Purpose of the Study:

• To review recent advancements in thermal insulation NFAs.
• To elucidate heat transfer mechanisms within NFAs.
• To explore structural engineering strategies and potential applications of NFAs.

Main Methods:

• Investigation of microstructure-heat transfer relationships in NFAs.
• Analysis of four construction strategies based on fiber component dimensions: reinforcement, 1D reconstruction, 2D stacking, and 3D direct production.
• Evaluation of the balance between mechanical and insulation properties achieved by different NFA structures.

Main Results:

• NFAs demonstrate tunable mechanical-insulation properties through controlled structural engineering.
• Specific construction strategies significantly influence thermal performance and mechanical integrity.
• Microstructure plays a key role in dictating heat transfer behavior.

Conclusions:

• NFAs represent a promising class of materials for advanced thermal protection.
• Structural engineering of fiber components offers a pathway to optimize NFA performance.
• NFAs show potential for applications beyond thermal insulation, including sound absorption and filtration.