Needle-punched electret air filters (NEAFs) with high filtration efficiency, low filtration resistance, and superior dust holding capacity

Zhang, Xing; Wang, Yuxiao; Liu, Wanjun; Jin, Xiangyu

doi:10.1016/j.seppur.2021.120146

Cited by 30 publications

(8 citation statements)

References 52 publications

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“…These show that the electrostatic charge generated by friction dissipates after use, thereby affecting the filtration efficiency. Zhang et al [ 67 ] reported that corona charges are much more stable than frictional charges and exhibit long-term stability. This is because corona charges can transfer from a “shallow trap” to a “deep trap”.…”

Section: Resultsmentioning

confidence: 99%

One-Step Fast Fabrication of Electrospun Fiber Membranes for Efficient Particulate Matter Removal

Liu,

Lai,

Shi

et al. 2024

Polymers

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Rapid social and industrial development has resulted in an increasing demand for fossil fuel energy, which increases particulate matter (PM) pollution. In this study, we employed a simple one-step electrospinning technique to fabricate polysulfone (PSF) fiber membranes for PM filtration. A 0.3 g/mL polymer solution with an N,N-dimethylformamide:tetrahydrofuran volume ratio of 3:1 yielded uniform and bead-free PSF fibers with a diameter of approximately 1.17 μm. The PSF fiber membrane exhibited excellent hydrophobicity and mechanical properties, including a tensile strength of 1.14 MPa and an elongation at break of 116.6%. Finally, the PM filtration performance of the PSF fiber membrane was evaluated. The filtration efficiencies of the membrane for PM2.5 and PM1.0 were approximately 99.6% and 99.2%, respectively. The pressure drops were 65.0 and 65.2 Pa, which were significantly lower than those of commercial air filters. Using this technique, PSF fiber membrane filters can be easily fabricated over a large area, which is promising for numerous air filtration systems.

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Section: Resultsmentioning

confidence: 99%

One-Step Fast Fabrication of Electrospun Fiber Membranes for Efficient Particulate Matter Removal

Liu,

Lai,

Shi

et al. 2024

Polymers

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“…The “curling” effect of CM on PP fibers increases the thickness and porosity of the nonwovens. This, in turn, helps to trap and retain charged particles, thereby increasing the surface potential [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

Preparation of Self-Curling Melt-Blown Fibers with Crimped Masterbatch (CM) and Its Application for Low-Pressure Air Filtration

Lin

et al. 2023

Polymers

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Particulate matter (PM) and airborne viruses pose significant threats to both the environment and public health. As the most viable solution to prevent the inhalation of these pollutants, there is an urgent demand for face masks with excellent filtration efficiency and low-pressure drop. In this study, a crimped masterbatch (CM) is added to polypropylene feedstocks to produce curling fibers through melt-blown spinning. These curled fibers exhibit low filtration resistance and effective dust-holding performances when used for air filtration. The effect of adding CM on fiber diameter, pore size, crimp, porosity, roughness, and surface potential was studied. The filtration performance of the materials, including the PM filtration capabilities, recirculation filtration, and loading test performance, were also investigated. The results demonstrate that the degree of fiber crimp can be adjusted by incorporating varying amounts of CM. This curling was caused by the uneven shrinkage that occurred due to variations in thermal contraction between these polymers. The curled fibers created a fluffy structure in the fiber network and modified the distribution of pore sizes within it. Under the same filtration conditions as sodium chloride aerogel, CM–2 (PP:CM 8:2) exhibited similar filtration efficiency (95.54% vs. 94.74%), lower filtration resistance (88.68 Pa vs. 108.88 Pa), higher quality factor (0.035 Pa−1 vs. 0.028 Pa−1) and better dust holding capacity (10.39 g/m2 vs. 9.20 g/m2) compared to CM–0 (PP:CM 10:0). After 30 days of indoor storage, the filtration efficiency of CM–2 remained above 94%. The self-curling melt-blown filtration material developed here could potentially be applied in the field of protective masks.

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“…Kothari et al 16 reported a needle punched structure with improved filtration efficacy and other related properties namely dimensional stability, air permeability, compression-recovery, tensile strength, abrasion resistance and friction by using finer and thicker fiber in 50:50 ratio and changing punch density. In a similar way, Zang et al 17 presented air filter with high filtration efficiency, and large dust holding capacity using needle-punched electret air filter. Wang et al have developed further improved filter media of needle-punched triboelectric air filter with silica-modified polytetrafluoroethylene fibers and polyphenylene sulfide fibers.…”

Section: Introductionmentioning

confidence: 99%

The combined effect of carding and punching parameters on the structural, mechanical and functional properties of needle-punched nonwovens

Roy

Ishtiaque

Dixit

et al. 2022

Journal of Industrial Textiles

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Fresh and pollution-free air is very much required to breathe normal and healthy life. However, due rise in the usage of automobiles and industrialization, the pollution load is also increasing day by day. Hence efficient filter media is in high demand. In this research, a systematic study was planned and executed for the development of efficient and bio-degradable filter media. A total of five process parameters; carding parameters namely, feeder speed, cylinder speed, and doffer speed, and punching parameters namely punch density and depth of penetration were considered as input parameters were considered and their effect on the physical and functional properties of the final fabric were studied. Forty-six samples were prepared as per 5 factor-3 level Box and Behnken design. The properties such as fabric thickness, tenacity, air permeability, and filtration efficiency were evaluated. Finally, the carding and punching parameters were optimized for achieving the required characteristics of filter media and achieving the best performance.

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Needle-punched electret air filters (NEAFs) with high filtration efficiency, low filtration resistance, and superior dust holding capacity

Cited by 30 publications

References 52 publications

One-Step Fast Fabrication of Electrospun Fiber Membranes for Efficient Particulate Matter Removal

One-Step Fast Fabrication of Electrospun Fiber Membranes for Efficient Particulate Matter Removal

Preparation of Self-Curling Melt-Blown Fibers with Crimped Masterbatch (CM) and Its Application for Low-Pressure Air Filtration

The combined effect of carding and punching parameters on the structural, mechanical and functional properties of needle-punched nonwovens

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