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

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.