Multilevel structured TPU/PS/PA-6 composite membrane for high-efficiency airborne particles capture: Preparation, performance evaluation and mechanism insights

Bicomponent PLA Nanofiber Nonwovens as Highly Efficient Filtration Media for Particulate Pollutants and Pathogens

“…Here, the equipment shown in Figure 6a was used to test the filtration efficiency and pressure drop of each fiber membrane sample. As presented in Figure 6b, the filtration process of nanofiber filter materials for aerosol particles was a synergetic effect of inertial impaction, interception, diffusion, electrostatic adsorption, and gravitation mechanisms [7,51]. The filtration efficiency, pressure drop and air permeability of single-spinning fibers and side-by-side fibers under different AlCl 3 content conditions were evaluated in detail (Figure 6c-e) so as to analyze the effect of AlCl 3 particles on the filtration performance.…”

“…Studies have shown that several ways of transmission for SARS-CoV-2 include droplet transmission, body fluid transmission, aerosol transmission, and contact with contaminated surfaces [4,5]. In addition, microorganisms such as bacteria and viruses in the air can attach to particulates, which gradually enter the human organs through the respiratory system, leading to cardiovascular and respiratory diseases [6,7]. Accordingly, in addition to using diagnostic tools to screen infected people and isolate them to prevent further spread of the virus, people are encouraged to wear suitable protective equipment, such as an N95 face mask, which has proved to be the most effective infection control approach [8].…”

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

“…The synergistic effect of mechanical filtration and strong electrostatic adsorption realized high–efficiency and low–resistance air filtration, in which PS electret layer was the main filtration function layer, providing strong filtration capacity. The filtration efficiency for 0.3 μm NaCl particles was 99.99 %, the air resistance was 54 Pa, and the QF was 0.17 Pa −1 [68] . However, it is difficult for nonpolar electret fibers to achieve high filtration efficiency alone, because the deposition of fibers is difficult due to charge repulsion [68] .…”

“…The filtration efficiency for 0.3 μm NaCl particles was 99.99 %, the air resistance was 54 Pa, and the QF was 0.17 Pa −1 [68] . However, it is difficult for nonpolar electret fibers to achieve high filtration efficiency alone, because the deposition of fibers is difficult due to charge repulsion [68] .…”

“…Currently, in the same case, electrospun air filter which QF is better than commercial high efficiency particulate air filter (HEPA) can be regarded owing high filtration performance [13] . Particularly, existing studies have widely used specific conditions (i.e., for 0.3 μm NaCl particles under air flow of 32 L/min or velocity of 5.3 cm/s) to characterize the filtration performance of electrospun air filter, under which their QFs are generally higher than the commercial meltblown masks [41] , [67] , [68] , [69] .…”