Abstract
Traffic noise pollution has posed a huge burden to the global economy, ecological environment and human health. However, most present traffic noise reduction materials suffer from a narrow absorbing band, large weight and poor temperature resistance. Here, we demonstrate a facile strategy to create flexible ceramic nanofibrous sponges (FCNSs) with hierarchically entangled graphene networks, which integrate unique hierarchical structures of opened cells, closed-cell walls and entangled networks. Under the precondition of independent of chemical crosslinking, high enhancement in buckling and compression performances of FCNSs is achieved by forming hierarchically entangled structures in all three-dimensional space. Moreover, the FCNSs show enhanced broadband noise absorption performance (noise reduction coefficient of 0.56 in 63–6300 Hz) and lightweight feature (9.3 mg cm–3), together with robust temperature-invariant stability from –100 to 500 °C. This strategy paves the way for the design of advanced fibrous materials for highly efficient noise absorption.
Highlights
Traffic noise pollution has posed a huge burden to the global economy, ecological environment and human health
To satisfy the first three requirements, flexible SiO2 nanofibers (SNFs) with good thermal stability were chosen as the building block to assemble fibrous framework structure; 2D GO nanosheets with good flexibility were selected as binder and macropore blocking agents to build effective entanglement among SNFs and block the pores of the fibrous cavity wall[20,31]
The SNFs became well dispersed with the average fiber length of 161 μm (Supplementary Fig. 2), and the obtained SNF dispersion was mixed with GO aqueous solution by high-speed stirring
Summary
Traffic noise pollution has posed a huge burden to the global economy, ecological environment and human health. The FCNSs show enhanced broadband noise absorption performance (noise reduction coefficient of 0.56 in 63–6300 Hz) and lightweight feature (9.3 mg cm–3), together with robust temperature-invariant stability from –100 to 500 °C This strategy paves the way for the design of advanced fibrous materials for highly efficient noise absorption. Due to the inherent limitations of large fiber diameter (usually >5 μm) and low porosity (1000 Hz) faced by traditional noise absorbers, thereby providing a broader vision for developing high-efficiency noise reduction materials
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