Hydrophobic, elastic Cyclodextrin-based aerogel with stable broadband sound absorption

The rapid development of human society has brought much noise pollution, which damage our quality of life seriously. However, it is difficult to design a material with broadband sound absorption performance. Herein, we explored composite aerogels composed of cyclodextrin, CNC and siloxane. The resulting CCA aerogels have broadband sound absorption performance. The bandwidth with a sound absorption coefficient greater than 0.8 can be over 5000 Hz (750–1250, 1750–6400 Hz), and the best sound absorption coefficient appears at the low frequency (around 768 Hz, 0.95). The CCA aerogels also show good elasticity and their mechanical properties are better than most sound-absorbing materials. Furthermore, CCA aerogels exhibit stable broadband sound absorption performance in humid environment or after compression treatment.