Controllable diameter of electrospun nanofibers based on the velocity of whipping jets for high-efficiency air filtration
Electrospun nanofibers are regarded as a promising candidate for filtration because of their prominent size effect. The precise control of nanofiber diameter is the key to the material’s outstanding filtration capability, but it remains a challenge. Herein, an electrohydrodynamic scaling model is established for the accurate prediction of fiber diameter based on the velocity of the whipping jet. In this model, the velocity reflects jet stretching and is tuned by adding salt. The theoretical predictions agree well with the experimental results. With the proposed diameter model, the filtration property of the membrane is significantly optimized by governing the fiber diameter. When the nanofiber is slenderized to 183 nm, an ultralight (0.521 g m −2 ) membrane exhibits high filtration efficiency (99.93%) and low pressure drop (105.2 Pa) against ultrafine aerosol particles (≤0.26 µm) under an airflow face velocity of 5.33 cm s −1 . These findings demonstrate that the established surface charge-based diameter model provides an excellent platform to timely and accurately control the nanofiber diameter via the velocity of whipping jets for high-efficiency air filtration.
危险品化学品经营许可证（带存储）