Radiation Characterization of Smart Aerogels Based on Hollow VO₂ Particles

Area of Science:

• Materials Science
• Nanotechnology
• Energy Science

Background:

• Smart aerogels offer dynamic thermal regulation by adjusting emittance with temperature.
• Thermochromic materials are key to developing adaptable radiative cooling technologies.
• Energy consumption and carbon emissions reduction are critical global challenges.

Purpose of the Study:

• To design and analyze smart aerogels utilizing hollow vanadium dioxide (VO2) particles for enhanced emittance modulation.
• To investigate the radiation characteristics of individual hollow VO2 particles and the overall aerogel structure.
• To provide a theoretical basis for advanced infrared smart aerogels for energy-saving applications.

Main Methods:

• Calculated radiation characteristics of single hollow VO2 particles using the multi-sphere superposition T-matrix method.
• Determined aerogel radiation characteristics via the Monte Carlo method.
• Optimized particle radius (1 μm) and shell thickness (40 nm) for thermal regulation.

Main Results:

• Hollow VO2 particles demonstrated excellent thermal regulation properties.
• A 50 μm thick VO2 particle smart aerogel with a 2.5% volume fraction achieved an emittance of 51.295%.
• The designed aerogel exhibits significant emittance modulation capabilities.

Conclusions:

• The study successfully designed a smart aerogel with tunable infrared emittance using hollow VO2 particles.
• Optimized hollow VO2 particle dimensions are crucial for effective thermal regulation.
• This research lays the groundwork for developing highly efficient, energy-saving infrared smart aerogels.