Sound insulation properties in low-density, mechanically strong and ductile nanoporous polyurea aerogels

Malakooti, Sadeq; Churu, Habel Gitogo; Lee, Alison; Xu, Tingge; Luo, Huiyang; Xiang, Ning; Sotiriou‐Leventis, Chariklia; Leventis, Nicholas; Lu, Hongbing

doi:10.1016/j.jnoncrysol.2017.09.005

Cited by 35 publications

(35 citation statements)

References 24 publications

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“…We have previously showed the feasibility of the Biot's dynamic poroelasticity on the modeling of the normal incidence STL of the single layer PUA aerogels at different bulk densities . In order to recheck the applicability of the Biot's theory on the wave propagation problems including the aerogel materials, here the modeling methodology was extended to a multilayered composite material with the help of theory of elasticity and acoustics field theory.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the slight structural weight change by applying the low‐density multifunctional PUA aerogels, this uncommon STL enhancement clearly breaks the empirical mass law in sound insulation behavior of conventional acoustics materials. Owing to their low thermal conductivity, low‐cost and facile molding and machining of this type of organic aerogel materials, it is envisioned that they will become attractive at several advanced engineering scenes where extreme sound and/or heat insulations are required . Finally, a 2D plane strain analytical solution was provided to model the wave propagations through the layered composite material.…”

Section: Discussionmentioning

confidence: 99%

“…The Young's modulus, ultimate stress, and strain for the PUA aerogels were up to 300 MPa, 631 MPa, and 88%, respectively, at densities lower than 0.5 g cm −3 which indicate a high level of ductility and load‐bearing capacity for these low‐density materials . Recently, we also discovered exceptionally high normal incidence sound transmission loss (STL) properties for these PUA aerogels . The STL values were reached up to 40 dB, in contrast to traditional acoustics materials, such as polyurethane foam, which can only reach up to 5 dB .…”

Section: Introductionmentioning

confidence: 95%

“…A systematic approach for the aerogel material parameterization has been previously proposed and validated by the authors . In this approach, all required material parameters for this class of PUA aerogels are estimated mainly based on the aerogel bulk density.…”

Section: Analytical Modelingmentioning

confidence: 99%

“…Recently, we also discovered exceptionally high normal incidence sound transmission loss (STL) properties for these PUA aerogels . The STL values were reached up to 40 dB, in contrast to traditional acoustics materials, such as polyurethane foam, which can only reach up to 5 dB . Furthermore, despite most passive materials (e.g., open‐celled materials), which have weak acoustic performance in sonic absorption at low frequency range (i.e., less than 5 kHz), the aerogels showed remarkably high acoustic absorption and attenuation over the entire low frequency range.…”

Section: Introductionmentioning

confidence: 98%

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Sound Transmission Loss Enhancement in an Inorganic‐Organic Laminated Wall Panel Using Multifunctional Low‐Density Nanoporous Polyurea Aerogels: Experiment and Modeling

et al. 2018

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Recently, the authors have reported an exceptional normal incidence sound transmission loss characteristic for a class of low density, highly porous, and mechanically strong polyurea aerogels. Herein, a laminated composite comprising the organic low-density aerogels bonded with an inorganic compound (e.g., gypsum materials) is considered to investigate the constrained damping effects of the aerogels on the airborne sound insulation behavior of the composite using the standard chamber-based diffuse sound field measurements. Huge improvement in the sound transmission loss is obtained due to the use of aerogel without a significant increase in the overall weight and thickness of the composite panel (e.g., more than 10 dB increase by reaching 40 dB sound transmission loss at 2 kHz after the implementation of only two 5 mm-thick aerogel layers at bulk densities 0.15 and 0.25 g cm À3 ). This uncommon behavior breaks the empirical "Mass Law" nature of the most conventional acoustic materials. In addition, an exact analytical time-harmonic plane-strain solution for the diffused wave propagation through the multilayered structure is provided using theories of linear elasticity and Biot's dynamic poroelasticity. The theoretical results are well supported by the experiments which can be utilized for the design of the future light-weight multifunctional composite structures.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Analytical Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Sound Transmission Loss Enhancement in an Inorganic‐Organic Laminated Wall Panel Using Multifunctional Low‐Density Nanoporous Polyurea Aerogels: Experiment and Modeling

et al. 2018

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Acoustic Properties of Aerogels: Current Status and Prospects

et al. 2022

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Noise pollution has been aptly described as one of the modern plagues. [1] Due to many adverse health effects of loud environments, ranging from sleep disturbances to cardiovascular diseases, reducing the exposure of humans to excess noise is essential to the public health of large populations living in the cities. Regarding sound absorption materials, the optimal choice depends on the intended sound frequency range; solutions of damping high-frequency sound waves rely on totally different absorption mechanism than the solutions for very low-frequency noise. Indoors, the most commonly used sound absorption materials are porous by nature due to their ability to efficiently absorb sound at mid to high frequencies with relatively thin layers. Common porous absorption materials in the market, targeting to over 90% absorption above 350 Hz, are glass and mineral wools and acoustic foams made, e.g., from melamine or polyurethane. Here, we review the acoustic properties of aerogels and demonstrate their high potential to challenge and exceed the absorption properties of the current market standards, whether we talk about the performance in

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High‐Performance Sound Detection of Nanoscale‐Thick and Large‐Area Graphene Oxide Films in Liquids

et al. 2023

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This article presents nanoscale‐thick and large‐area graphene oxide (GO) films manufactured by a facile method to enable high‐performance sound detection in liquids. A Fabry–Perot (F–P) cavity consisting of a GO film, whose vibration diameter is ≈4.4 mm, and a single‐mode fiber (SMF) is used as the sensing core for sound detection in liquids. A sound‐transparent cap, consisting of a support sleeve and a sound‐transparent sleeve, is used to protect the GO‐sensing diaphragm to resist liquid pressure to enable long‐term stability. The sensing probes with GO diaphragms of ≈100 and 200 nm thickness are placed in ultra‐pure water for performance testing. Test results show that they maintain a linear sound pressure response, a flat frequency response, and a uniform directional response from 1 to 100 kHz. They have sensitivities of ≈630 mV Pa−1 and about 84 mV Pa−1, respectively, in the range of 1–100 kHz in all directions in different liquids. These results demonstrate the suitability of the nanoscale‐thick and large‐area GO films for sound detection in liquids with high performance.

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Sound insulation properties in low-density, mechanically strong and ductile nanoporous polyurea aerogels

Cited by 35 publications

References 24 publications

Sound Transmission Loss Enhancement in an Inorganic‐Organic Laminated Wall Panel Using Multifunctional Low‐Density Nanoporous Polyurea Aerogels: Experiment and Modeling

Sound Transmission Loss Enhancement in an Inorganic‐Organic Laminated Wall Panel Using Multifunctional Low‐Density Nanoporous Polyurea Aerogels: Experiment and Modeling

Acoustic Properties of Aerogels: Current Status and Prospects

High‐Performance Sound Detection of Nanoscale‐Thick and Large‐Area Graphene Oxide Films in Liquids

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