Acoustic Properties of Aerogels: Current Status and Prospects
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A2 Katsausartikkeli tieteellisessä aikakauslehdessä
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Date
2023-03
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Language
en
Pages
26
Series
Advanced Engineering Materials, Volume 25, issue 6
Abstract
Noise reduction remains an important priority in the modern society, in particular, for urban areas and highly populated cities. Insulation of buildings and transport systems such as cars, trains, and airplanes has accelerated the need to develop advanced materials. Various porous materials, such as commercially available foams and granular and fibrous materials, are commonly used for sound mitigating applications. In this review, a special class of advanced porous materials, aerogels, is examined, and an overview of the current experimental and theoretical status of their acoustic properties is provided. Aerogels can be composed of inorganic matter, synthetic or natural polymers, as well as organic/inorganic composites and hybrids. Aerogels are highly porous nanostructured materials with a large number of meso- and small macropores; the mechanisms of sound absorption partly differ from those of traditional porous absorbers possessing large macropores. The understanding of the acoustic properties of aerogels is far from being complete, and experimental results remain scattered. It is demonstrated that the structure of the aerogel provides a complex three-dimensional architecture ideally suited for promising high-performance materials for acoustic mitigation systems. This is in addition to the numerous other desirable properties that include low density, low thermal conductivity, and low refractive index.Description
This work was supported and carried out in the framework of COST Action CA18125 “Advanced Engineering and Research of aeroGels for Environment and Life Sciences” (AERoGELS, https://www.cost.eu/actions/CA18125), funded by the European Commission. The authors thank Noora Jäntti (Aalto University) for technical help. H.L. acknowledges the support of the U.S. Department of Energy's National Nuclear Security Administration under contracts DE-NA-0003525 and DE-NA0003962 and the Louis A. Beecherl Jr. Endowed Chair. S.M. would like to thank the United States National Aeronautics and Space Administration (NASA) Postdoctoral Program at the NASA Glenn Research Center, administered by Oak Ridge Associated Universities under contract with NASA. A.R. and B.M. acknowledge the support of the Program Directorate Aeronautics of the German Aerospace Center (Project: Innovative Digital Cabin Design – InDiCaD). J.V. acknowledges funding from Academy of Finland's Flagship Program under Project Nos. 318890 and 318891 (Competence Center for Materials Bioeconomy and FinnCERES). S.V. acknowledges the support of the NASA Space Technology Mission Directorate (STMD).
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Citation
Budtova, T, Lokki, T, Malakooti, S, Rege, A, Lu, H, Milow, B, Vapaavuori, J & Vivod, S 2023, ' Acoustic Properties of Aerogels: Current Status and Prospects ', Advanced Engineering Materials, vol. 25, no. 6, 2201137 . https://doi.org/10.1002/adem.202201137
