Electrospun Modified SiO₂ Nanofiber Membranes as Superamphiphobic Self-Cleaning Filters with High Heat Stability for Efficient Particle Matter Capture

Abstract

Superamphiphobic electrospinning nanofiber membranes (e-NFM) with an excellent particle matter (PM) filtration efficiency have been fabricated by the combination treatment of electrospinning, calcination, and surface modification. Herein, with the ultrafine 80 nm bead-string fiber, the as-prepared SiO2 e-NFM had a superb PM2.5 filtration efficiency (>99.9%). Moreover, the SiO2 e-NFM retained the original physical properties of the membrane at 1000 °C and varieties of acid–base extreme environments. After surface modification with poly­(vinylidene fluoride-co-hexafluoropropylene) and fluoroalkyl silane, the membrane abbreviated as F-SiO2 e-NFM was superamphiphobic and it was first applied to the PM filtration. With the advantages of repellency of water and oil, it was self-cleaning to have a high removal effect on oil-bearing particle pollutants even in high-humidity environments. Furthermore, for its soft and foldable mechanical properties, it can be reused several times while still maintaining a high efficiency. Such a superamphiphobic nanofiber membrane with an excellent PM separation efficiency and the potential for multiple reuses in various situations could be widely employed in the development of air filters.

Electrospun Nanocomposite Fibrous Membranes for Sustainable Face Mask Based on Triboelectric Nanogenerator with High Air Filtration Efficiency

“…The filtration efficiency was determined by the number of particles upstream and downstream of the filtration device (recorded as N 1 and N 2 , which was detected by the particle counter), and the efficiency can be calculated by η= (N 1 -N 2 )/N 1 × 100%. Number of particles before and after filtration was tested using a particle counter (DT-9883 M, PM size range: 0.3–10 μm) [ 37 , 46 ]. The pressure drop was characterized by the pressure drop measuring instrument (Testo 510).…”

Electrospun Ag‐dopedPA6multi‐stage structured nanofiber membrane with antibacterial property for oily particulate matters filtration

“…Zhang et al 21 synthesized polyacrylonitrile/graphene oxide (PAN/GO) nanofiber by electrospinning method, the PM 2.5 filtration efficiency could be up to 99.6%, and the pressure drop was 117 Pa. After 100 h of adsorption, the PM 2.5 filtration efficiency could still reach 99.1%. Also, Lu et al 22 fabricated F‐SiO 2 e‐NFM by the combination treatment of electrospinning, calcination, and surface modification, its filtration efficiency for PM 2.5 and PM 10 was above 99.9%. After 48 h, the filtration efficiency for PM 2.5 and PM 10 could still achieve 98.642 ± 0.0642% and 99.634 ± 0.0022%, respectively.…”

Surface-Modified Electrospun Glass Nanofibers from Silane Treatment and Their Use for High-Performance Epoxy-Based Nanocomposite Materials

“…Glass and ceramic nanofibers are examples of non-polymer nanofibers that have been developed recently through electrospinning a spin dope containing glass/ceramic precursor materials followed by sol-gel processing and subsequent pyrolysis at elevated temperatures with aims of exploring their energy, electronic, and catalytic utilizations [5,6]. Due to readily available precursors, e.g., tetraethyl orthosilicate (TEOS), chemical inertness, thermal stability, low thermal conductivity, and biocompatibility, electrospun glass (SiO 2 ) nanofibers (EGNFs) have been used for energy, industrial catalysis, insulation, separation, and biomedical applications [7][8][9][10][11]. A noteworthy fact about EGNFs is that they may possess outstanding tensile strength and modulus like those of bulk glass [12] and can, therefore, be used as reinforcing fillers to make highperformance nanofiber-reinforced PMCs [4].…”