A review on electrospun membranes for potential air filtration application

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Electrospun Nanofibers Containing Natural Deep Eutectic Solvents Exhibiting a 3D Rugose Morphology and Charge Retention Properties

“…Air filter media are generally made of chemically synthesized or petroleum-based raw materials, such as polypropylene . Meantime, researchers are still endeavoring for the design and development of innovative biobased organic recyclable nanofiber filtration membranes to fabricate highly efficient filtration systems with potentially lower carbon footprint. ,, Additionally, many attempts have been made to functionalize conventional synthetic or natural polymers through specific additives to enhance their filtration performance or functionality; however, these additives can be expensive. , Hence, the development of filtration membranes made of a natural microbial biopolymer having excellent biocompatibility and biodegradability characteristics, and making it a strong candidate to be used in air filtering applications by incorporating cheap and green NADES, is expected to add significant value to the vibrant field of air filtration applications. Herein, it was demonstrated for the first time that NADES, which has numerous and unexplored potential applications, could play a new application role in improving filtration efficiency for biopolymers such as PHBV.…”

“… 12 , 68 , 69 Additionally, many attempts have been made to functionalize conventional synthetic or natural polymers through specific additives to enhance their filtration performance or functionality; however, these additives can be expensive. 12 , 68 Hence, the development of filtration membranes made of a natural microbial biopolymer having excellent biocompatibility and biodegradability characteristics, and making it a strong candidate to be used in air filtering applications by incorporating cheap and green NADES, is expected to add significant value to the vibrant field of air filtration applications. Herein, it was demonstrated for the first time that NADES, which has numerous and unexplored potential applications, could play a new application role in improving filtration efficiency for biopolymers such as PHBV.…”

Electrospun nanofibers for medical face mask with protection capabilities against viruses: State of the art and perspective for industrial scale-up

“…The electrospinning is another flexible technique to fabricate polymer nonwoven fibers and has been attracting great attention from the scientific research community and from industries due to its application in air filter systems [70] . The physical phenomena of the ES dates to the 16th century when William Gilbert for the first time observed the formation of a cone shaped droplet as a consequence of the exposure to the electrostatic field [71] .…”

“…A decrease of the fiber diameter to the nanoscale has been observed to contribute in increasing the capture of fine aerosols particles (< 0.5 μm) [ 62 , 90 , 91 ]. Since the diameter of electrospun nanofiber can be comparable with the free path of air molecules at ambient condition, a slip flow regime occurs around the single nanofiber [ 26 , 70 , 92 ]. In this regime the fiber's drag force friction is substantially reduced, therefore a low momentum exchange between the fine particles and the fiber surface occurs, resulting in a low pressure drop [93] .…”

Modeling pressure drop values across ultra-thin nanofiber filters with various ranges of filtration parameters under an aerodynamic slip effect

“…These large-sized fibers require a substantial thickness to capture PM with a high removal efficiency, which induces large pressure drops. To address this trade-off between efficiency and pressure drop, nanofiber filters with the fiber sizes from tens of nanometers to hundreds of nanometers, which are produced by electrospinning process, have attracted significant attention [18][19][20][21][22] . One of the distinct advantages of nanofiber filters is that due to the aerodynamic slip around the surface of the small nanofibers, resistance against gas flow is reduced, which leads to lower pressure drops across individual fibers [23][24][25][26] .…”