Acoustic absorption properties of granular silica aerogels

dc.contributor.authorDasyam, Amrutha
dc.contributor.authorKhaleel, Ola
dc.contributor.authorSharma, Bhisham N.
dc.description.abstractAerogels are a class of synthetic materials derived using supercritical drying to extract the liquid component of a gel and replacing it with a gas. This process results in the formation of an ultra-lightweight nanoporous solid composed of up to 99.98% air by volume. Here, we characterize the absorption properties of commercially available aerogel granules using a two-microphone impedance tube. Four different aerogels with granule diameters ranging from 2- to 4000 μm and granule densities ranging 120 to 180 kg/m3 are tested. The results show that the aerogel granules are highly effective in absorbing sound over a wide frequency range. Further, we use an inverse characterization approach to obtain their acoustic transport properties and explore the possibility of modelling them as an equivalent rigid-frame porous material within the frequency range of interest.en_US
dc.description.sponsorshipThis material is based upon work supported by a Seed Research Initiation grant under the Kansas NASA EPSCoR Program Research Infrastructure Development program. Amrutha Dasyam would also like to acknowledge the support through an Undergraduate Research and Creative Activities grant provided by Wichita State University.en_US
dc.identifier.citationDasyam, A., Khaleel, O., & Sharma, B. (2020). Acoustic absorption properties of granular silica aerogels. Paper presented at the Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020,en_US
dc.publisherInstitute of Noise Control Engineeringen_US
dc.relation.ispartofseriesINTER-NOISE and NOISE-CON Congress and Conference Proceedings;
dc.rights.holder© Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020. All rights reserved.en_US
dc.subjectAcoustic impedanceen_US
dc.subjectAcoustic noiseen_US
dc.subjectAcoustic variables controlen_US
dc.subjectAcoustic wave absorptionen_US
dc.subjectPorous materialsen_US
dc.subjectSilica gelen_US
dc.titleAcoustic absorption properties of granular silica aerogelsen_US
dc.typeConference paperen_US
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