Preparation and properties of PTFE hollow fiber membranes for the removal of ultrafine particles in PM<sub>2.5</sub> with repetitive usage capability

Xu, Huan; Jin, Wanqin; Wang, Feng; Li, Chengcai; Wang, Jieqi; Zhu, Hailin; Guo, Yuhai

doi:10.1039/c8ra07789d

Cited by 27 publications

(18 citation statements)

References 42 publications

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“…The developed transparent thin filter can be applied to indoor air protection through windows or incorporated into existing personal masks. Inspired by Lui's promising results, a variety of electrospun nanofibre membranes with different surface chemistry and mechanical or thermal properties have been developed from polymers, polymer blends, or polymer composites with surface-functionalized inorganic nanofillers for air purification investigations, including polyurethane [ 127 ], polycarbonate [ 128 ], poly(vinyl alcohol) [ 129 ], polytetrafluoroethylene [ 130 ], polybenzimidazole [ 131 ], polyacrylonitrile/polysulfone [ 132 ], polypropylene/polyethylene [ 133 ], polyurethane/polysulfonamide [ 134 ], polyacrylonitrile/graphene oxide [ 135 ], and polyacrylonitrile/MXene [ 136 ]. Besides conventional electrospinning, polymer nanofibre membranes mass-produced by needless electrospinning [ 137 ] and solution blow spinning [ 138 ] also demonstrated effectiveness for the capture of particulate pollutants.…”

Section: Engineering Of Multifunctional Masks and Mask Materialsmentioning

confidence: 99%

Face Masks in the New COVID-19 Normal: Materials, Testing, and Perspectives

et al. 2020

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The increasing prevalence of infectious diseases in recent decades has posed a serious threat to public health. Routes of transmission differ, but the respiratory droplet or airborne route has the greatest potential to disrupt social intercourse, while being amenable to prevention by the humble face mask. Different types of masks give different levels of protection to the user. The ongoing COVID-19 pandemic has even resulted in a global shortage of face masks and the raw materials that go into them, driving individuals to self-produce masks from household items. At the same time, research has been accelerated towards improving the quality and performance of face masks, e.g., by introducing properties such as antimicrobial activity and superhydrophobicity. This review will cover mask-wearing from the public health perspective, the technical details of commercial and home-made masks, and recent advances in mask engineering, disinfection, and materials and discuss the sustainability of mask-wearing and mask production into the future.

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Section: Engineering Of Multifunctional Masks and Mask Materialsmentioning

confidence: 99%

Face Masks in the New COVID-19 Normal: Materials, Testing, and Perspectives

et al. 2020

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“…Recently, a lyotropic micro-crosslinking method [76] has been used to improve the properties of polyimide nanofibers, as shown in Scheme 6A-C. By pre-heat, solvent treatment, and high-temperature treatment, the resultant fibers can overcome the disorder, no-bonding, and fluffiness. In another study, cold press curing treatment [77] was adopted to improve the solvent resistance, heat resistance, and mechanical properties of the fiber membrane. The cold pressing uniformly compressed the fiber membrane so that the fibers are more closely contacted to form a physical crosslinking point, and the curing is chemically crosslinked to form a network structure.…”

Section: Enhanced By Crosslinkingmentioning

confidence: 99%

Progress of Improving Mechanical Strength of Electrospun Nanofibrous Membranes

Han

Zhang

et al. 2020

Macro Materials & Eng

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Electrospun nanofibers with superior performance have attracted widespread attention from researchers due to their extensive application in biomedical materials, filtration, catalysis, and so forth. However, the low mechanical properties, such as elongation at breaking strength and tensile strength, restrict the application of the nanofibers in many aspects. This article describes the recent progress in improving the mechanical properties of electrospun nanofibrous membranes. At present, methods to increase the mechanical strength of nanofibers are mainly based on the introduction of appropriate polymer materials, improvements in spinning parameters, and post-treatment. Herein, the principle, advantages, and disadvantages of those methods in depth are described. Finally, the research on enhancing the mechanical properties of electrospun nanofibrous membranes and their future development is being discussed.

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“… 37 Furthermore, some have shown easy regeneration/reuse of HFMs in filtering aerosols. 29 , 36 To our knowledge, no studies have demonstrated viral aerosol capture using HFM modules with differing properties. Efforts to design filters and methods for removing/deactivating viral aerosols have increased in light of the current coronavirus pandemic.…”

Section: Introductionmentioning

confidence: 99%

Demonstration of Hollow Fiber Membrane-Based Enclosed Space Air Remediation for Capture of an Aerosolized Synthetic SARS-CoV-2 Mimic and Pseudovirus Particles

et al. 2022

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Reduction of airborne viral particles in enclosed spaces is critical in controlling pandemics. Three different hollow fiber membrane (HFM) modules were investigated for viral aerosol separation in enclosed spaces. Pore structures were characterized by scanning electron microscopy, and air transport properties were measured. Particle removal efficiency was characterized using aerosols generated by a collision atomizer from a defined mixture of synthetic nanoparticles including SARS-CoV-2 mimics (protein-coated 100 nm polystyrene). HFM1 (polyvinylidene fluoride, ∼50–1300 nm pores) demonstrated 96.5–100% efficiency for aerosols in the size range of 0.3–3 μm at a flow rate of 18.6 ± 0.3 SLPM (∼1650 LMH), whereas HFM2 (polypropylene, ∼40 nm pores) and HFM3 (hydrophilized polyether sulfone, ∼140–750 nm pores) demonstrated 99.65–100% and 98.8–100% efficiency at flow rates of 19.7 ± 0.3 SLPM (∼820 LMH) and 19.4 ± 0.2 SLPM (∼4455 LMH), respectively. Additionally, lasting filtration with minimal fouling was demonstrated using ambient aerosols over 2 days. Finally, each module was evaluated with pseudovirus (vesicular stomatitis virus) aerosol, demonstrating 99.3% (HFM1), >99.8% (HFM2), and >99.8% (HFM3) reduction in active pseudovirus titer as a direct measure of viral particle removal. These results quantified the aerosol separation efficiency of HFMs and highlight the need for further development of this technology to aid the fight against airborne viruses and particulate matter concerning human health.

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Preparation and properties of PTFE hollow fiber membranes for the removal of ultrafine particles in PM_2.5 with repetitive usage capability

Abstract: This study reveals the first attempt to apply PTFE hollow fiber membranes for removing ultrafine particles in PM2.5.

Cited by 27 publications

References 42 publications

Face Masks in the New COVID-19 Normal: Materials, Testing, and Perspectives

Face Masks in the New COVID-19 Normal: Materials, Testing, and Perspectives

Progress of Improving Mechanical Strength of Electrospun Nanofibrous Membranes

Demonstration of Hollow Fiber Membrane-Based Enclosed Space Air Remediation for Capture of an Aerosolized Synthetic SARS-CoV-2 Mimic and Pseudovirus Particles

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Preparation and properties of PTFE hollow fiber membranes for the removal of ultrafine particles in PM2.5 with repetitive usage capability

Abstract: This study reveals the first attempt to apply PTFE hollow fiber membranes for removing ultrafine particles in PM2.5.

Cited by 27 publications

References 42 publications

Face Masks in the New COVID-19 Normal: Materials, Testing, and Perspectives

Face Masks in the New COVID-19 Normal: Materials, Testing, and Perspectives

Progress of Improving Mechanical Strength of Electrospun Nanofibrous Membranes

Demonstration of Hollow Fiber Membrane-Based Enclosed Space Air Remediation for Capture of an Aerosolized Synthetic SARS-CoV-2 Mimic and Pseudovirus Particles

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Preparation and properties of PTFE hollow fiber membranes for the removal of ultrafine particles in PM_2.5 with repetitive usage capability