Annular Air‐Jet Focused Electrospinning of Tiny‐Caliber Nanofiber Filter for High‐Efficiency Air Filtration

Abstract In light of the detrimental impact of environmental pollution from particulate matter (PM), the potential of nanofiber filters to effectively filter air particles has garnered significant attention. However, it remains a challenge to modulate the fine spatial structure and enhance the filtration efficiency of nanofiber filters in one step using existing electrostatic spinning techniques. In this study, an efficient and controllable nanofiber filter is presented using annular air‐jet focused electrospinning composed of a focused airflow field and an electric field. The originally perturbed fibers are to be drawn and confined in a customized channel, creating a fluffy porous structure that is beneficial for fluid flow and adsorption‐interception of the tiny PM. Compared to electrospinning, the depositional area significantly is reduced from 51.33 ± 0.4 to 7.07 ± 0.2 cm 2 by controlling the parameters such as focused point, air pressure, and collector distance. These filters show high PM 0.3 removal efficiency (99.22%) and high porosity (71.24%). Importantly, the nanofiber filters can be formed by a one‐step method. Meanwhile, the prepared filters are also tested to be applicable and stable for cigarette smoke. The ability of AAFE to control fiber deposition in tiny‐caliber offers a streamlined approach to fabricating nanofiber filters.