Highly Compressible Micro/Nanofibrous Sponges with Thin-Walled Cavity Structures Enable Low-Frequency Noise Reduction.
basic_science · Level V
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- Record sourced from PubMed, PMID 39723673.
- Also identified by DOI 10.1021/acs.nanolett.4c05906.
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Abstract
Increasing noise pollution has generated a tremendous threat to human health and incurred great economic losses. However, most existing noise-absorbing materials present a significant challenge in achieving lightweight, robust mechanical stability, and efficient low-frequency (<1000 Hz) noise reduction. Herein, we create highly compressible micro/nanofibrous sponges with thin-walled cavity structures for efficient noise reduction through electrospinning and dispersion casting. Manipulating the phase separation driven by solution/water interaction in jets enables formation of fluffy fibrous frameworks, on which the deformation of casting dispersion is controlled to develop thin-walled cavity structures consisting of semiopened cells and entangled networks. The resultant sponges exhibit lightweight characteristics (2.2 mg cm<sup>-3</sup>) and mechanical robustness, integrated with remarkable low-frequency noise reduction capability (absorption coefficient up to 0.98) benefiting from vibration and viscous friction effects of cavity-structured skeletons. This work may offer new horizons for designing advanced fibrous acoustical materials, inspiring next-generation noise-reducing devices in aerospace and transportation.