Preparation, design, structure and application of aerogel-based materials for noise control

The imminent threat of noise pollution requires the development of efficient acoustic materials. Aerogels have been considered as a promising noise reduction materials due to their special porous structure, lightweight and acoustic delay characteristics. Currently, a variety of aerogels are investigated on materials, fabrication processes and structural design to explore the feasibility of aerogels as acoustic materials. This paper explains the acoustic mechanism for noise control, describes the mathematical models of sound absorption and insulation, as well as the preparation process of aerogels, and finally reviews the research progress and building application of aerogels in noise control. The future development of aerogels in noise control is also discussed.