Amphiphobic polytetrafluoroethylene membrane with a ring-on-string-like micro/nano structure for air purification

Lu, Xin; Chen, Yingdong; Yan, Wentao; Wang, Kaizhen; Yong, Zhou; Gao, Congjie

doi:10.1016/j.memsci.2022.120476

Cited by 15 publications

(6 citation statements)

References 41 publications

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“…However, the lowsurface-energy of PTFE materials made the adhesion properties unsatisfactory due to chemical inertness and nonpolar molecular structure. [42][43][44] Meanwhile, the stability of adhesion between inner layer and skin layer can significantly affect the long-term use. In order to solve the above problems, we propose a new kind of method by the combination of wrapping and heat setting technology to fabricate PTFE-HFM.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of harsh environment‐tolerant and robust reinforced poly (tetrafluoroethylene) hollow fiber membranes with optimal heat setting technology

Chen,

Yan

et al. 2024

J of Applied Polymer Sci

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The high‐temperature industrial waste oil treatment has put forward new requirements for membrane materials. Poly (tetrafluoroethylene) (PTFE) is regarded as the excellent membrane material for membrane process, due to its excellent properties. Herein, the reinforced PTFE hollow fiber membrane (PTFE‐HFM) was prepared by the combination of wrapping and heat setting technology. The objection of this study was focusing on the outstanding chemical and thermal resistance of PTEF‐HFM for overcoming harsh waste oil treatment. PTFE‐HFM exhibited better chemical resistance in the experiment of acid and alkali compared to PVDF‐HFM, which the surface of PVDF‐HFM corroded obviously and none of PTFE‐HFM. The pore size and porosity were precisely adjusted by heat setting technology. Firstly, the morphologies of PTFE‐HFM was investigated by scanning electron microscopy, which exhibited favorable interfacial bonding state between PTFE separation layer and supporting layer. Subsequently, the prepared membranes exhibited high‐temperature waste oil permeability of 195 L m−2 h−1 bar−1with only 3% attenuation in long‐term operation. Besides, the rejection of lubricants contained activated carbon also reached to 99%. Overall, the facile preparation and excellent performance of robust reinforced PTFE‐HFM highlights its great potential in treating high‐temperature waste oil.

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Section: Introductionmentioning

confidence: 99%

Fabrication of harsh environment‐tolerant and robust reinforced poly (tetrafluoroethylene) hollow fiber membranes with optimal heat setting technology

Chen,

Yan

et al. 2024

J of Applied Polymer Sci

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“…The nanofibrous membranes prepared by electrospinning techniques have been extensively studied in air filtration. − They possess a tunable fiber diameter, good porosity, and high specific surface area, which are beneficial to improve the filtration efficiency of particulate matter and reduce air resistance . Meanwhile, the electrostatic charge on the surface of nanofibrous membrane can adsorb pathogens and particulate matter in the air, reducing the risk of disease. , Electrospun polymer materials are numerous and have been successfully used in air filter applications, including polyacrylonitrile (PAN), , polylactic acid (PLA), , polytetrafluoroethylene (PTFE), polyimide (PI), polyamide-6 (PA-6), polyurethane (PU), polyvinyl alcohol (PVA), , etc. Among them, PAN possesses a large dipole moment, wear resistance, good chemical stability, and good weather resistance .…”

Section: Introductionmentioning

confidence: 99%

“…24 Meanwhile, the electrostatic charge on the surface of nanofibrous membrane can adsorb pathogens and particulate matter in the air, reducing the risk of disease. 25,26 Electrospun polymer materials are numerous and have been successfully used in air filter applications, including polyacrylonitrile (PAN), 27,28 polylactic acid (PLA), 29,30 polytetrafluoroethylene (PTFE), 31 polyimide (PI), 32 polyamide-6 (PA-6), 33 polyurethane (PU), polyvinyl alcohol (PVA), 34,35 etc. Among them, PAN possesses a large dipole moment, wear resistance, good chemical stability, and good weather resistance.…”

Section: Introductionmentioning

confidence: 99%

Reusable Electrospun Nanofibrous Membranes with Antibacterial Activity for Air Filtration

Wang

Sun

Zhao

et al. 2023

ACS Appl. Nano Mater.

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The demand for face masks is increasing exponentially, especially when the coronavirus pandemic and particulate matter (PM) pollution have become serious concerns to public health. However, a lot of pressure is caused by the frequent replacement of traditional masks due to the easy dissipation of electrostatic charge and the accumulation of pathogenic microorganisms. Herein, nanofibrous membranes with efficient inhibition of bacteria, potent air filtration, and reusability performance, consisting of polyacrylonitrile (PAN) nanofibers coated with chitosan quaternary ammonium salt (HACC), were successfully manufactured by simple impregnation method and coaxial electrospinning, respectively. The bactericidal rate of the nanofibrous membranes to the attached bacteria was as high as 99.9% due to the excellent bactericidal activity of the quaternary ammonium groups, which could also be proven by the microscopic appearance of the bacterial cell membrane rupture. The permanent dipole charges provided by PAN nanofibers endowed as-prepared nanofibrous membranes the capability to stably capture PM even when the static electricity disappeared. Moreover, the filtration capacity of nanofibrous membranes could still be close to the initial value after a simple washing, which was even unattainable by commercial filters. These nanofibrous membranes are expected to replace traditional disposable filters to achieve long-life and reusability expectations.

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“…7 In order to enhance the filtration performance of filter bags, expanded polytetrafluoroethylene (ePTFE) membrane-based fibrous filters have emerged as the preferred choice over the past decade due to their filtration efficiency reaching as high as 99.99%. 8,9 However, the ePTFE membrane has a thickness ranging from 10 to 25 micrometers and low mechanical strength, making it susceptible to damage from collisions with particles in the flue gas [10][11][12] As an alternative to ePTFE membrane, PTFE emulsion is another approach to enhance the filtration efficiency of fibrous filters. PTFE emulsion is well known for its outstanding thermal stability, chemical resistance, low surface energy and good electrical insulation, 13 widely used for dipping and coating in the fields of anti-corrosion, abrasive resistance, filtration.…”

Section: Introductionmentioning

confidence: 99%

A continuous polytetrafluoroethylene foam-coating to glass fiber mat with superior self-cleaning, antistatic and high filtration efficiency performances

Chen

Zeng

et al. 2023

Journal of Industrial Textiles

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Air pollution has become a significant global environmental issue, leading to adverse health effects and respiratory diseases. To address this challenge, expanded polytetrafluoroethylene (ePTFE) membrane-based fibrous filters have gained popularity in the past decade. However, the thinness and low mechanical strength of ePTFE membranes make them susceptible to damage from particle collisions. As an alternative to ePTFE membranes, PTFE emulsion has emerged as a promising approach to enhance filtration efficiency. However, due to PTFE's low surface energy and high crystallinity, it is difficult for PTFE to self-bond into a membranes and adhere to substrates. Therefore, the filtration efficiency of PTFE-impregnated filter materials does not meet the requirements for ultra-low emissions, and they have poor wear resistance, resulting in a short service life. Herein, we fabricate a PTFE emulsion foam-coating membrane filter. The influences of the contents of PVA on the film morphology, air permeability, pore size and distribution, abrasive resistance and antistatic properties were analyzed. The self-cleaning performance was simulated and the filtration performance was measured as well. Notably, the frictional mass loss index of the PTFE emulsion foam-coating membrane filter was 0.07. After 30 cycles, the filtration efficiency was 98.93%, and the strip ratio was 91.03%. Our design of the PTFE emulsion foam-coating provided a new direction for the application of PTFE emulsion in the filtration field with superior self-cleaning, antistatic and high filtration efficiency performances.

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Amphiphobic polytetrafluoroethylene membrane with a ring-on-string-like micro/nano structure for air purification

Cited by 15 publications

References 41 publications

Fabrication of harsh environment‐tolerant and robust reinforced poly (tetrafluoroethylene) hollow fiber membranes with optimal heat setting technology

Fabrication of harsh environment‐tolerant and robust reinforced poly (tetrafluoroethylene) hollow fiber membranes with optimal heat setting technology

Reusable Electrospun Nanofibrous Membranes with Antibacterial Activity for Air Filtration

A continuous polytetrafluoroethylene foam-coating to glass fiber mat with superior self-cleaning, antistatic and high filtration efficiency performances

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