Hierarchically maze-like structured nanofiber aerogels for effective low-frequency sound absorption
Hierarchically maze-like structured nanofiber aerogels for effective low-frequency sound absorption
复制标题
分层迷宫状结构的纳米纤维气凝胶可有效吸收低频声音
DOI：
10.1016/j.jcis.2021.03.172
复制
发表时间：
2021-04-13
影响因子：
9.9
通讯作者：
Ding, Bin
中科院分区：
文献类型：
--
作者：
Cao, Leitao;Yu, Xi;Ding, Bin
噪声已被认为是一种严重影响人们身心健康的环境污染物。纤维吸声材料被广泛应用于缓解噪声污染带来的烦恼，但纤维材料在低频、厚重、厚度过大等方面的吸声能力较差。本文中，复合纤维素气凝胶被设计为具有分级迷宫状微观结构，其通过冷冻浇铸技术通过将纤维素纤维片层与聚丙烯腈电纺纤维素网络交织而制成。所设计的迷宫状结构在低频吸声频带上比网络结构的纤维气凝胶有明显的增强。此外，通过对迷宫结构的精细调控，可以制备出具有优异吸声性能（NRC为0.58）和轻质性能（11.05 mg cm（-3））的复合吸声气凝胶。除了上级吸声能力之外，迷宫状结构的分层性质还保证了具有稳健机械性能的可膨胀气凝胶，其可以大规模定制各种形状的物体。这些优良的特性表明，复合气凝胶在车辆、建筑、室内混响等领域具有良好的吸声性能。(C)2021爱思唯尔公司All rights reserved.
Noise has been regarded as an environmental pollutant that greatly affects people's physical and psychiatric health. Fibrous sound absorption materials are widely used to release the annoyance that brought by noise pollution, however, the fibrous materials are limited by poor sound absorption ability in low-frequency, heavyweight, and excessive thickness. Herein, composite nanofiber aerogels are designed with a hierarchical maze-like microstructure, which is fabricated by interweaving the cellulose nanocrystal lamellas with polyacrylonitrile electrospun nanofiber networks through the freeze-casting technique. The designed maze-like structure shows obvious enhancement in the low-frequency sound absorption band compared to the fiber aerogels made by the network structure. Moreover, through carefully regulating the maze structure, composite nanofiber aerogels with excellent sound absorption performance (with an NRC of 0.58) and lightweight property (11.05 mg cm(-3)) can be fabricated. In addition to the superior sound absorption ability, the hierarchical nature of the maze-like structure also guarantees the nanofiber aerogels with robust mechanical properties, which can be tailored to various shaped objects on a large scale. These favorable characters present that the composite nanofiber aerogels potential choice for sound absorption in the fields of vehicles, buildings, and indoor reverberation. (C) 2021 Elsevier Inc. All rights reserved.