Abstract
Massive quantities of fly ash are produced worldwide from thermal power plants, posing a serious environmental threat due to their storage and disposal problems. In this study, for the first time, fly ash is converted into an advanced and novel aerogel through a green and eco-friendly process. The developed aerogel has a low density of 0.10–0.19 g cm−3, a high porosity of up to 90%, a low thermal conductivity of 0.042–0.050 W/mK, and a good sound absorption coefficient (noise reduction coefficient [NRC] value of 0.20–0.30). It also shows a high compressive Young’s modulus of up to 150 kPa. Therefore, the newly developed fly ash aerogel is a potential material for thermal and acoustic insulation applications, along with lightweight composites in automotive and aerospace applications.
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