Abstract:An increasing number of studies have reported deleterious health effects of vehicle-emitted particulate matter (PM), including PM2.5 (aerodynamic diameter≤2.5 μm), black carbon (BC), and ultrafine particles (UFPs, diameter≤100 nm). When commuting inside school buses, children are exposed to high level of these pollutants due to emissions from both school bus itself and other on-road vehicles. This study developed an on-board high efficiency cabin air (HECA) filtration system for reducing children's exposure in… Show more
“…With rapid urbanization and industrialization the particulate matter (PM) pollution in air, especially the notorious PM 2.5 , causes growing impact on people's living quality, and it poses serious health threats to the public, fatally interferes with equipment operation, as well as influencing climate and ecosystems [1][2][3]. Moreover, stricter emission limits for fine particle emissions from industrial processes and automotive exhaust have also contributed to the urgent need for high performance filters with high filtration efficiency, low energy cost, and long service life [4,5].…”
“…With rapid urbanization and industrialization the particulate matter (PM) pollution in air, especially the notorious PM 2.5 , causes growing impact on people's living quality, and it poses serious health threats to the public, fatally interferes with equipment operation, as well as influencing climate and ecosystems [1][2][3]. Moreover, stricter emission limits for fine particle emissions from industrial processes and automotive exhaust have also contributed to the urgent need for high performance filters with high filtration efficiency, low energy cost, and long service life [4,5].…”
“…The particulate matter (PM) pollution in air, especially the notorious PM 2.5 and its attached biological matter involving bacteria and viruses, causes growing impact on people's living quality, and it poses serious health threats to the public, fatally interferes with equipment operation, as well as influencing climate and ecosystems [1][2][3]. Moreover, increasingly stringent regulations for fine particle emissions have also contributed to the urgent need for high performance filters [4,5].…”
“…Numerous studies have shown that exposure to PM 2.5 (aerodynamic diameter ≤2.5 μm) leads to direct and indirect adverse effects on people’s health status and living, visibility, climate, and ecosystems123. Nowadays, the fibrous filters have been widely used for PM filtration due to their fascinating features, such as relatively energy-efficient, cost-effectiveness, ease of scalable fabrication, changeable filter design, and application universality45.…”
Effective promotion of air filtration applications proposed for fibers requires their real nanoscale diameter, optimized pore structure, and high service strength; however, creating such filter medium has proved to be a tremendous challenge. This study first establishes a strategy to design and fabricate novel poly(m-phenylene isophthalamide) nanofiber/nets (PMIA NF/N) air filter via electrospinning/netting. Our strategy results in generation of a bimodal structure including a scaffold of nanofibers and abundant two-dimensional ultrathin (~20 nm) nanonets to synchronously construct PMIA filters by combining solution optimization, humidity regulation, and additive inspiration. Benefiting from the structural features including the true nanoscale diameter, small pore size, high porosity, and nets bonding contributed by the widely distributed nanonets, our PMIA NF/N filter exhibits the integrated properties of superlight weight (0.365 g m−2), ultrathin thickness (~0.5 μm), and high tensile strength (72.8 MPa) for effective air filtration, achieving the ultra-low penetration air filter level of 99.999% and low pressure drop of 92 Pa for 300–500 nm particles by sieving mechanism. The successful synthesis of PMIA NF/N would not only provide a promising medium for particle filtration, but also develop a versatile platform for exploring the application of nanonets in structural enhancement, separation and purification.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.