Multilevel structured polyacrylonitrile/silica nanofibrous membranes for high-performance air filtration

Preparation of hierarchical structured nano-sized/porous poly(lactic acid) composite fibrous membranes for air filtration

“…It is also well-known that a large specific surface area and a rough surface of the fiber improve a fibrous membrane's fine particle filtration performance [26]. To further investigate the effect of porous structure on the properties, including the specific surface area, nanopore structure, fiber diameter, and filtration performance of the resultant PLA fibers, PLA-P fibers with different morphologies were prepared by varying the relative humidity from 15% to 60% whereas the other parameters were kept constant (with a feed rate of 1 ml/h and applied high voltage of 16 kV), as shown in Fig.…”

“…Wang et al have prepared scaffold-like structured PAN fibrous membranes constructed by bimodal-sized PAN fibers and PAN/SiO 2 membranes with different assembled structures (multilevel and monolayer). The analysis results revealed that the amount of PAN fibers with different diameters in the scaffold-like composite membranes have a profound influence on filtration properties and the multilevel structured filter possesses a much better filtration performance than that of the monolayer filter media with the same basis weight [26]. As mentioned above, the fiber diameter and morphology, especially the microstructure of its surface, have a dramatic effect on the particle capture ability and pressure drop of the relevant fibrous filter.…”

“…When the mass ratio of PLA-P fibers and PLA-N fibers is 1/5, the filtration efficiency of the DSM is 0.12% higher than that of the ISM at the face velocity of 14.1 cm/s, which can be attributed to the multilevel structured filtering [26]. Furthermore, the stacking double-layer structured mat also benefited from the compensation of the inferior parts, and the relatively large packing density may also contribute to the additional capture of particles.…”

Electreted polyetherimide–silica fibrous membranes for enhanced filtration of fine particles

“…Efficient, cost-effective strategies to separate harmful particles from polluted air, especially the fine particles (aerodynamic diameter <2.5 lm), are greatly desired [2,3]. Fibrous membranes based technologies are attractive for fine particle filtration because they are relatively energy-efficient, cost-effective, and are applicable across a wide range of industrial pollutants [4].…”

Facile electrospun Polyacrylonitrile/poly(acrylic acid) nanofibrous membranes for high efficiency particulate air filtration

“…The first group comprises organic and inorganic electrospun fibrous membranes, such as chitosan, ceramic, and silica NFs as filtration mediums without other supporting substrate [6][7][8], but the brittleness or poor mechanical property of these materials limits their practical applications. Second, two-tier structure based on electrospun NFs have been employed as filtration medium, such as TiO 2 /PAN-cellulose bare filter media, and SiO 2 /PAN or polyamide-66-nonwoven polypropylene supporting layer [9][10][11]. Such two-tier fibrous medium make suitable device substrates for applications owing to their high filtration performance, tensile strength and longer lifetime, however, this method was harsh on the selection of raw materials [12].…”