High‐Performance Integrated Micro‐Vortex Air Filter Enabled With Honeycomb‐Like Structured Nanofibrous Networks

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Abstract Particulate matter (PM) pollution has posed a serious threat to public health, especially with the outbreak of respiratory infections. However, most existing fiber filters face an inevitable trade‐off between removal efficiency and air resistance, due to their thick fibers and uncontrolled flat stacking structure. Herein, a unique high‐performance integrated micro‐vortex filter is created using honeycomb‐like structured cellular nanofibrous networks via the innovative electro‐netting‐assembly nanotechnique for air filtration. Manipulation of the ejection, deformation, and self‐assembly of the charged droplets from the Taylor cone enables the one‐step construction of 3D cellular cells with 2D nano architectured networks consisted of 1D nanowires with a diameter of ≈45 nm on a large‐scale. The resultant micro‐vortex air filter, functioned as an integrated filter system, achieved a remarkable air slip effect and striking micro‐vortex cascade filtration mode, showing >99.97% PM 0.3 removal, ≈0.12% atmosphere pressure of air resistance, 27 g m −2 dust holding, along with robust mechanical stability. This work may provide a promising avenue for the design and development of novel separation and purification materials.

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