Fibrous Filter to Protect Building Environments from Polluting Agents: A Review

Chavhan, Md. Vaseem; Mukhopadhyay, Arunangshu

doi:10.1007/s40034-015-0071-3

Cited by 15 publications

(16 citation statements)

References 29 publications

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“…Face mask and respirator structure are designed so that aerosol particles can be filtered out using a combination of the following five mechanisms – 1) gravity settling, 2) inertial impaction on the fibers, 3) interception by the fibers, 4) diffusion, and 5) electrostatic attraction. [ 65 , 66 , 67 , 68 ] For aerosol particles >1 µm, the first two mechanisms play an important role. However, as the aerosol's particle size decreases, other mechanisms dominate the filtration process.…”

Section: Introductionmentioning

confidence: 99%

Masks for COVID‐19

et al. 2021

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Sustainable solutions on fabricating and using a face mask to block the severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) spread during this coronavirus pandemic of 2019 (COVID‐19) are required as society is directed by the World Health Organization (WHO) toward wearing it, resulting in an increasingly huge demand with over 4 000 000 000 masks used per day globally. Herein, various new mask technologies and advanced materials are reviewed to deal with critical shortages, cross‐infection, and secondary transmission risk of masks. A number of countries have used cloth masks and 3D‐printed masks as substitutes, whose filtration efficiencies can be improved by using nanofibers or mixing other polymers into them. Since 2020, researchers continue to improve the performance of masks by adding various functionalities, for example using metal nanoparticles and herbal extracts to inactivate pathogens, using graphene to make masks photothermal and superhydrophobic, and using triboelectric nanogenerator (TENG) to prolong mask lifetime. The recent advances in material technology have led to the development of antimicrobial coatings, which are introduced in this review. When incorporated into masks, these advanced materials and technologies can aid in the prevention of secondary transmission of the virus.

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Section: Introductionmentioning

confidence: 99%

Masks for COVID‐19

et al. 2021

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“…Compared to the micrometer‐scale counterparts, the nanofibers that function as air filters show many amazing advantages benefiting from their relatively small pore size and high porosity, such as enhanced removal efficiency, improved service life, etc . These advantages have expanded their applications to respirators, heating, ventilation and air conditioning (HVAC) filters, high‐efficiency particulate air (HEPA) filters, ultralow penetration air (ULPA) filters, and other highly sophisticated products . Various polymers have been used to produce nanofiber media for air filtration via the electrospinning strategy, such as polyurethane (PU), polyacrylonitrile (PAN), polyvinylidene fluoride, poly(lactic acid) (PLA), polyvinyl chloride (PVC)/PU, polycarbonate, silk, PA‐6, polyimide, etc.…”

Section: Introductionmentioning

confidence: 99%

A Controlled Design of Ripple‐Like Polyamide‐6 Nanofiber/Nets Membrane for High‐Efficiency Air Filter

Zhang

Liu

Zuo

et al. 2017

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The filtration capacity of fibrous media for airborne particles is restricted by their thick diameter, low porosity, and limited frontal area. The ability to solve this problem would have broad technological implications for various air filtration applications; despite many past efforts, it remains a great challenge to achieve. Herein, a facile and scalable strategy to fabricate the ripple-like polyamide-6 nanofiber/nets (PA-6 NF/N) air filter via combining electrospinning/netting technique with receiving substrate design is demonstrated. This proposed approach allows the scaffold filaments to orderly embed into 2D PA-6 nanonets layer with Steiner-tree structures and nanoscale diameter of ≈20 nm, resulting in the ripple-like membrane with extremely small pore size, highly porous structure, and hugely extended frontal surface, by facilely adjusting its pleat span and pleat pitch. These unique structural advantages enable the ripple-like PA-6 NF/N filter to filtrate the ultrafine particles with high removal efficiency of 99.996%, low air resistance of 95 Pa, and robust quality factor of >0.11 Pa ; using its superlight weight of 0.9 g m and physical sieving manner. This approach has the potentialities to give rise to a novel generation of filter media displaying enhanced filtration capacity for various applications thanks to their nanoscale features and designed macrostructures.

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“…Currently, commercial filters can be divided into different grades based on their unique structural characteristics and filtration performances, such as coarse filter, medium filter, high-medium filter, subhigh efficiency filter, high efficiency particulate air filter, and ultralow penetration air filter. 24 Inspired by that, we designed an integrated filter with a gradient structure by using needlepunched fabric as the coarse filtration layer and melt blown fabric as the fine filter layer [ Figure 5 the upper layer and the melt blown fabric was at the lower layer. The fascinating web structure enabled us to investigate the pore properties.…”

Section: Structural Construction and Performance Evaluation Of The Nementioning

confidence: 99%

Design of three‐dimensional gradient nonwoven composites with robust dust holding capacity for air filtration

Zhang

Liu

Zhang

et al. 2019

J of Applied Polymer Sci

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Air pollution has seriously threatened public health in developing countries. However, it is still a big challenge for fabricating a filter with high filtration efficiency, low air resistance, and long service life. Herein, we report a facile strategy to fabricate a multilayered nonwoven composite with a functionally gradient structure for air filtration by a combined method of needle‐punch, melt blown, and corona charging techniques. Our integrated multilayer needle‐punched/melt blown composite filter could achieve a high filtration efficiency up to 99.52 ± 0.01%, a low pressure drop of 136.87 ± 0.49 Pa, and a satisfied quality factor of 0.03898 ± 0.0001 Pa−1 for sodium chloride particles with an aerodynamic diameter of 0.26 μm at the airflow rate of 85 L min−1. More importantly, the resultant filter exhibited a large dust holding capacity of 23.5 ± 0.41 g m−2, which indicates a long service life. It is expected that our multilayer needle‐punched/melt blown composite fabric may not only serve as a good candidate for air filtration, but also provide a new sight for designing the air filtration materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47827.

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Fibrous Filter to Protect Building Environments from Polluting Agents: A Review

Cited by 15 publications

References 29 publications

Masks for COVID‐19

Masks for COVID‐19

A Controlled Design of Ripple‐Like Polyamide‐6 Nanofiber/Nets Membrane for High‐Efficiency Air Filter

Design of three‐dimensional gradient nonwoven composites with robust dust holding capacity for air filtration

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