State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Textiles, Donghua University, Shanghai 201620, China.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Textiles, Donghua University, Shanghai 201620, China.
J Colloid Interface Sci. 2021 Sep;597:21-28. doi: 10.1016/j.jcis.2021.03.172. Epub 2021 Apr 2.
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) 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.
噪声被认为是一种对人们的身心健康有很大影响的环境污染物。纤维状吸声材料被广泛用于减轻噪声污染带来的烦恼，但纤维材料在低频、重量大、厚度过大时的吸声能力有限。在这里，通过冷冻铸造技术，用纤维素纳米晶薄片交织聚丙烯腈静电纺纳米纤维网络，设计了具有分级迷宫状微观结构的复合纳米纤维气凝胶。与由网络结构制成的纤维气凝胶相比，所设计的迷宫状结构在低频吸声带中表现出明显的增强。此外，通过仔细调节迷宫结构，可以制备具有优异吸声性能（NRC 为 0.58）和轻质特性（11.05mg/cm）的复合纳米纤维气凝胶。除了卓越的吸声能力外，迷宫状结构的分级性质还保证了纳米纤维气凝胶具有强大的机械性能，可以大规模地适应各种形状的物体。这些优良的特性表明，复合纳米纤维气凝胶是车辆、建筑和室内混响等领域吸声的理想选择。
