Materialism: A Materials Science Podcast Episode 105: Cooling Paints
May 22, 2025
Discover how cooling paints can keep your home cooler without breaking the bank. The hosts dive into the science of innovative coatings, translating complex physical principles into practical solutions for energy efficiency. Explore the balance between aesthetics and functionality, using examples that spotlight unique materials like Oreos and eggshells. Health concerns around VOCs and nanoparticles are also examined, adding depth to the discussion on sustainable options for modern cooling technologies.
AI Snips
Chapters
Transcript
Episode notes
Physics Behind Cooling Paints
- Cooling paints work by passive radiative cooling, reducing solar absorption and maximizing thermal emission.
- They reflect solar wavelengths and emit heat especially in the 8-13 micron atmospheric window for effective cooling.
Walkie Talkie Building Melts Car
- The Walkie Talkie skyscraper in London reflected sunlight so intensely it melted cars and scorched sidewalks.
- Similar effects occurred with its Las Vegas counterpart, illustrating architectural risks of focused reflections.
Key Pigments and Their Roles
- Pigments in cooling paints include titanium oxide, silica, alumina, and barium sulfate, each with specific optical properties.
- Particle size distribution matters: a broad range enhances scattering and reflection across the solar spectrum.