Interlocked Dual‐Network and Superelastic Electrospun Fibrous Sponges for Efficient Low‐Frequency Noise Absorption

Abstract

Traffic noise is a major source of urban noise pollution, with severe threats to the physiological and psychological health of humans. Fibrous sound absorption materials are extensively applied in the control of traffic noise pollution; however, the larger fiber diameters and monotonous internal structure of such materials result in poor low‐frequency sound‐absorbing properties or unsatisfied mechanical properties. Herein, a biomimetic and robust strategy to design ultrastrong and superelastic fibrous sound absorption sponges is reported, which is achieved by integrating a one‐step forming technique of interlocked micro/nano dual fiber networks and an in situ crosslinking approach. The obtained vine‐like interlocked structured fibrous sponges can withstand a tensile force 10 000 times their weight without deformation. Furthermore, the materials also show outstanding compression fatigue resistance and a lightweight feature (8.70 mg cm−3). Most importantly, the interlocked dual‐network‐induced stable fluffy‐stacked structure endows the fibrous sponges with an enhanced low‐frequency sound‐absorbing property (absorption coefficient of 0.93 at 1000 Hz), which is superior to those of commercial and reported sound absorption materials. In addition, the materials also possess good hydrophobicity and temperature resistance. This work opens new pathways for the further development of highly efficient sound‐absorbing materials.

Flexible ceramic nanofibrous sponges with hierarchically entangled graphene networks enable noise absorption

“…Previous efforts were focused on using cost-effective fibrous materials as the core components for constructing noise-absorber [4][5][6] . However, due to the inherent limitations of large fiber diameter (usually >5 μm) and low porosity (<60%), the fatal defects of poor absorption of low-frequency (typically <1000 Hz) noise that is easily produced by vehicles remain for the conventional microfibrous noiseabsorbing materials [7][8][9] . To address this problem, it is necessary to increase the thickness or density of the fibrous materials, while which in turn lead to large weights (>50 mg cm -3 ) and poor absorption of high-frequency noise [10][11][12] .…”

Flexible Ceramic Nanofibrous Aerogels with Hierarchically Entangled Graphene Networks Enable Full-Frequency Noise Absorption

“…Besides, the sandwich structure effectively increased the internal interface of GCNAs, which enhanced the multistage re ection path of sound waves inside the material and thus successfully increased the sound energy consumption. 9 To con rm the outstanding noise reduction performance of the GCNAs, the NRC and corresponding areal density of the sandwiched GCNAs were compared with typical already reported and commercial noise reduction materials 19,27,63 . As shown in Fig.…”

“…[4][5][6] However, due to the inherent limitations of large ber diameter (usually >5 μm) and low porosity (typically <60%), the fatal defects of poor absorption of low-frequency noise that is easily produced by vehicles remain for the conventional micro brous noise-absorbing materials. [7][8][9] To address this problem, it is necessary to increase the thickness or density of the brous materials, while which in turn lead to high weights (>50 mg cm -3 ) and decreasing consumption of high-frequency sound waves. [10][11][12] Moreover, the vehicle's space left for sound-absorbing materials is limited, and increasing the density will improve fuel consumption, which violates the principle of energy saving.…”

Research Progress on Sound Absorption of Electrospun Fibrous Composite Materials

“…The composite structure is porous and shows good sound absorption performance in the 800–2500 Hz frequency range. Zong et al [ 84 ] reported a fibrous sound absorption sponge with an interlocked dual-network-induced stable fluffy-stacked structure formed by PSU microfiber and PVDF nanofiber networks. The structure gives the fibrous sponge an excellent sound absorption property at low frequency, and its sound absorption coefficient could reach 0.93 at 1000 Hz.…”