Slip effect based bimodal nanofibrous membrane for high-efficiency and low-resistance air purification

High-performance multifunctional electrospun fibrous air filter for personal protection: A review

“…The existence of fiber does not affect the streamline, and there is almost no resistance, as shown in Fig. 2 [60] . Therefore, the smaller the diameter of single fiber, the stronger the slip effect, and it is expected to realize the air filtration process with low resistance [61] , [62] .…”

“…2 Theoretical diagram of slip effect of single fiber. Where, K n and D f stands for Knudsen Number and the diameter of fibers, respectively [60] . …”

“…On the other hand, the particle filtration process also needs to consider the influence of air flow field, because the slip effect widely exists in electrospun nanofibrous membrane, its influence on particle behavior cannot be ignored [58] . It has become a widespread consensus that the slip effect makes the nanofibrous membrane more breathable [59] , [60] , [61] . However, the airflow bypass may also make the particles bypass the fiber, which may have an adverse impact on the filtration.…”

“…8 (h). Then, the best bimodal fibers were determined (70 and 200 nm, respectively), which the filtration performance (QF = 0.065 Pa −1 ) was better than that of unimodal fibrous filters (QF = 0.058 Pa −1 ) [60] . Hence, the bimodal nanofibrous membrane constructed by layer–by–layer electrospinning has better filtration performance and can easily compound a variety of membranes with different functions, which is helpful to the preparation of multifunctional, efficient and low resistance fibrous membrane.…”

“…The simulated pressure with the fiber diameters of (c) 50, (d) 60, (e) 70, (f) 100, and (g) 200 nm. (h) The pressure drops of fibrous membranes with different fiber diameters [60] . …”