Chapter 03 of 5
Nanopores: The Physics of 99% Air
Why a material that is almost entirely empty space is a master insulator.
- Internal Architecture
A Skeleton of Glass
Aerogel is composed of a three-dimensional network of silica clusters. These clusters form a rigid, open-cell structure that is 99.8% empty space.
- Microscopic Scale
The Power of Nanopores
The 'empty' space isn't just one big bubble. It is divided into millions of tiny pores, each only 10 to 100 nanometers wide.
- Paradox
Solid or Gas?
Because it is mostly air, aerogel has a density close to that of the atmosphere. Yet, its silica skeleton allows it to hold its shape like a solid.
17 more cards in this chapter
Could you answer this?
Why is convection effectively eliminated within a silica aerogel structure?
☁️ The Impossible Smoke of Aerogel
- 01The Bet: Replacing Liquid with AirThe origins of the world's lightest solid from a 1930s laboratory wager.
- 02Supercritical Drying & The Phase ShiftMastering the physics of heat and pressure to create 'frozen smoke.'
- 03Nanopores: The Physics of 99% AirWhy a material that is almost entirely empty space is a master insulator.
- 04Stardust & The Cosmic VacuumHow NASA used aerogel to catch high-speed particles from a comet's tail.
- 05The Future of Less: Beyond SilicaModern iterations using carbon and polymers for the next generation of materials.