Frozen smoke (Aerogels)

Source-This post on Frozen smoke is based on the article “Sensors made from ‘frozen smoke’ can detect toxic formaldehyde in homes and offices” published in “Physics.org” on 9th February 2024.

Why in the News?

Researchers have recently created a sensor using “frozen smoke” that uses artificial intelligence to detect formaldehyde in real-time, even at concentrations as low as eight parts per billion. It can exceed the sensitivity of many indoor air quality sensors.

What is Frozen smoke?

1. It is technically known as aerogel and is an exceptional material. It’s praised as a miracle material.

2. It was first developed in the 1930s.

3. Properties:
a. Aerogel has low density, high thermal resistance, and a very porous structure.
b. Aerogel has the texture of a fine, dry sponge but feels significantly lighter. In fact, it holds the title as the world’s lightest solid.
c. When gently pressed, aerogel regains its original shape, but pressing harder creates a dimple. However, excessive pressure can cause aerogel to shatter into tiny pieces like glass.
d. They are mostly made of air and can eliminate contaminants.

What is Formaldehyde?

1. Formaldehyde is a colorless, strong-smelling gas used in various industries for manufacturing building materials and household products.

2. It is a volatile organic compound (VOC) that can be emitted by certain materials like pressed wood products, wallpapers, paints, and synthetic fabrics.

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