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<p>The rapid development of industry and transportation has given rise to serious noise pollution, which posing serious threats to the social economy and human physical and mental health. However, commonly existing fiber sound-absorbing materials are difficult to dissipate noise at low frequencies due to their single-pore structure. Herein, a hierarchical pore-structured elastic ceramic fibrous aerogel with fire-resistance was successfully designed and constructed through directional freeze-casting technology. The self-assembled nano-network and hierarchical pore structure by ceramic nanofiber improved noise injection and acoustic contact area. The noise reduction coefficient of the obtained ceramic fibrous aerogel reaches 0.49, and the maximum value of the sound absorption coefficient can be close to 1. In addition, the hydrophobic groups of the binder endow the fiber aerogel with superhydrophobic properties and bond adjacent fibers together to prevent slipping during deformation, imparting it with excellent compression resilience. Moreover, this ceramic aerogel can resist temperatures up to 600&#xa0;°C, exhibiting excellent compression resilience under the flame of an alcohol lamp, safe guarding building occupants. The successful construction of lightweight, hydrophobic, fire-resistant gradient structure aerogel will provide a new prospect for the upgrading of the next generation noise absorber.</p>

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Ceramic fibrous aerogels with hierarchical structure for noise reduction and fire-resistance

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Mengmeng Yang,
  • Wei Hu,
  • Lihao Liu,
  • Min Li,
  • Shouling Wang,
  • Rongbing Zhai,
  • Zhaofeng Chen

摘要

The rapid development of industry and transportation has given rise to serious noise pollution, which posing serious threats to the social economy and human physical and mental health. However, commonly existing fiber sound-absorbing materials are difficult to dissipate noise at low frequencies due to their single-pore structure. Herein, a hierarchical pore-structured elastic ceramic fibrous aerogel with fire-resistance was successfully designed and constructed through directional freeze-casting technology. The self-assembled nano-network and hierarchical pore structure by ceramic nanofiber improved noise injection and acoustic contact area. The noise reduction coefficient of the obtained ceramic fibrous aerogel reaches 0.49, and the maximum value of the sound absorption coefficient can be close to 1. In addition, the hydrophobic groups of the binder endow the fiber aerogel with superhydrophobic properties and bond adjacent fibers together to prevent slipping during deformation, imparting it with excellent compression resilience. Moreover, this ceramic aerogel can resist temperatures up to 600 °C, exhibiting excellent compression resilience under the flame of an alcohol lamp, safe guarding building occupants. The successful construction of lightweight, hydrophobic, fire-resistant gradient structure aerogel will provide a new prospect for the upgrading of the next generation noise absorber.