How To Make NANOFIBER/NET COMPOSITE MEMBRANES Air Filters?
Multilevel composite structures give an insight into highly integrated and efficient filtration media for various applications, including personal, industrial, and environmental protection, because of their fascinating features of controllable pore size, gradually varied pore structure, and high porosity. In view of this novel design strategy, Zhang et al. reported the fabrication of highly integrated multilevel PSU/PAN/PA-6 hybrid fibrous membranes to capture airborne particles from polluted air via the sequential electrospinning process, as shown in Fig. 12.13. Each layer of the integrated PSU/PAN/PA-6 composite membranes possessed the particular diameters and pore sizes for removing particles of different diameters. The PSU microfiber layer, with a fiber diameter of w1 mm and pore size of w2.2 mm, was employed to filter particles with a diameter of >2 mm; the PAN nanofiber layer, with fiber diameter of w200 nm and pore size of w0.55 mm, was used to filter >0.5-mm particles; while the PA-6 nanonet could rem