Aerosol filtration performance of nanofibrous mats produced via <scp>electrically assisted industrial‐scale</scp> solution blowing

Güngör, Melike; Toptas, Ali; Çalişir, Mehmet Durmuş; Kılıç, Ali

doi:10.1002/pen.25780

Cited by 13 publications

(22 citation statements)

References 51 publications

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“…According to the Knudsen number, the flow has four types of regimes: free molecular flow regime (Kn > 10), transition flow regime (0.1 < Kn ≤ 10), slip flow regime (0.001 < Kn ≤ 0.1), and continuum flow regime (Kn ≤0.001). [ 19,61 ] The “slip effect” prevails when the flow is in transition regime. The Knudsen number is calculated by dividing the mean free path length of the carrier gas by the fiber diameter through the equation below: [ 19 ]

Kn = 2 λ / {normald}_{normalf},

where λ is the mean free path length of gas (at standard conditions for air λ is 0.065 μm); d f is the average fiber diameter.…”

Section: Resultsmentioning

confidence: 99%

Optimization of electro‐blown polysulfone nanofiber mats for air filtration applications

Sarac

Kılıç

Taşdelen-Yücedağ

2023

Polymer Engineering & Sci

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Durable, robust, and hydrophobic air filtration media was produced via electro-blow spinning (EBS) technique using polysulfone (PSU) due to its superior properties. To our knowledge, this is the first optimization study of PSU nanofiber production via EBS technique for air filtration applications. Concentration, air pressure, and voltage were determined as independent variables for the optimization based on "smaller is the better" approach of Taguchi Design of Experiment. The optimized values which supplied the smallest average fiber diameter (AFD) possible were obtained as 13 wt% PSU, 3 bar, and 7.5 kV. The AFD of the sample obtained from the confirmation experiment was calculated as 105 ± 34 nm. Surface morphologies, porosity values, and wettability behaviors of the samples were investigated by using scanning electron microscopy, gravimetric method, and water contact angle measurements, respectively. PSU nanofiber mats exhibited superhydrophobic behavior (water contact angle values up to 159.8 ) which is important for various separation processes. Samples prepared at different deposition times (15, 30, 45, and 60 min) were investigated in terms of particle capture efficiency and pressure drop. The 0.3 μm particle filtration efficiency was found to be 98.09% at an expense of 202 Pa pressure drop which would be suitable for various respiratory and HVAC filter applications.

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Kn = 2 λ / {normald}_{normalf},

where λ is the mean free path length of gas (at standard conditions for air λ is 0.065 μm); d f is the average fiber diameter.…”

Section: Resultsmentioning

confidence: 99%

Optimization of electro‐blown polysulfone nanofiber mats for air filtration applications

Sarac

Kılıç

Taşdelen-Yücedağ

2023

Polymer Engineering & Sci

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“…The remaining polymer jet is stretched because of the air drag forces and then finally lands on a rotating vacuum collector . The throughput rate of the regular SB technique is 30 times higher than that of the regular ES technique . It is possible to produce fibers finer than 100 nm by SB without deploying a high voltage.…”

Section: Introductionmentioning

confidence: 99%

“… 38 The throughput rate of the regular SB technique is 30 times higher than that of the regular ES technique. 39 It is possible to produce fibers finer than 100 nm by SB without deploying a high voltage. Absence of electricity makes it possible to access the nozzle(s) during production in the case of any problems.…”

Section: Introductionmentioning

confidence: 99%

Aerosol Filtration Performance of Solution Blown PA6 Webs with Bimodal Fiber Distribution

et al. 2022

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A bimodal web, where both nanofibers and microfibers are present and distributed randomly across the same web, can deliver high filter efficiency and low pressure drop at the same time since in such a web, filter efficiency is high thanks to small pores created by the presence of nanofibers and the interfiber space created by the presence of microfibers, which is large enough for air to flow through with little resistance. In this work, a bimodal polyamide 6 (PA6) filter web was fabricated via a modified solution blowing (m-SB) technique that produced nanofibers and microfibers simultaneously. Scanning electron microscope (SEM) images of the webs were used to analyze the fiber morphology. Additionally, air permeability, solidity, porosity, filtration performance, and tensile strength of the samples were measured. The bimodal filter web consisted of nanofibers and microfibers with average diameters of 81.5 ± 127 nm and 1.6 ± 0.458 μm, respectively. Its filter efficiency, pressure drop at 95 L min–1, and tensile strength were 98.891%, 168 Pa, and 0.1 MPa, respectively. Its quality factor (QF) and tensile strength were 0.0268 Pa–1 and 0.1 MPa, respectively. When compared with commercially available filters, the bimodal web produced had superior filter performance, constituting a suitable alternative for air filter applications.

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“…Performance of filter media can be further improved by employing nanofibers that results in increased surface area and lower pressure drop due to slip effect. [11][12][13] Nanofibrous filters can be produced using different methods, electrospinning, 14 solution blowing, 15 centrifugal spinning, 16 electro-blowing (EB) 17 etc. Among them, EB is an efficient method since both electrostatic and air drag forces are utilized.…”

Section: Introductionmentioning

confidence: 99%

“…Meltblown and spunbond nonwoven substrates that are widely used on face mask and other filtration applications were employed and PA6 based nanofibrous layers with different thickness were coated via electroblowing in which production rate is 30 times higher than in the conventional electrospinning method. 17 It was also aimed to investigate the response of pressure drop with particle loading and filter clogging, with reference to effective pore diameter. As fiber diameter decreases smaller pores and larged solidity will be obtained at an expense of increased pressure drop and lower dust holding capacity.…”

Section: Introductionmentioning

confidence: 99%

Clogging performance of micro/nanofibrous laminated composite air filter media

Çalişir

Güngör

Toptas

et al. 2022

Journal of Industrial Textiles

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The performance of fibrous filter media relies on factors such as particle capture efficiency, pressure drop and clogging time. Fiber diameter, porosity and packing density are important web-based factors to improve final filtration performance. In this study, composite nonwoven webs were produced using spunbonded, meltblown and electroblown mats to obtain filter media with different fiber diameter, porosity and packing density. Such a layered composite approach caused huge differences in porosity and packing density, which resulted with improved clogging performance. The average fiber diameter was found to be 65 ± 19.4 nm for electroblown layer ( N), while that was 1.17 ± 0.38 μm for meltblown (M) and 17.64 ± 2.65 μm for spunbond (S) layers. NM (nanofiber+meltblown) configuration provided 12–13% lower mean flow pore size, which resulted in faster clogging compared to NS (nanofiber + spunbond) mats. The thicker nanofibrous layer resulted in lower pore size and quality factor. Additionally, the composite samples showed a faster-rising pressure drop than the thick microfibrous mats due to smaller pores that clogged quickly. It was also shown that nanofiber coating causes a linear increase in pressure drop with dust loading, while microfibrous samples exhibited smooth plateau and linear increase after clogging point. Nanofiber layer facilitates cake formation which causes more difficult airflow, and lower dust holding capacity. Among the layered composite mats, the NM configurations were found to be more advantageous due to higher initial filtration efficiency and almost similar dust loading performance.

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Aerosol filtration performance of nanofibrous mats produced via electrically assisted industrial‐scale solution blowing

Cited by 13 publications

References 51 publications

Optimization of electro‐blown polysulfone nanofiber mats for air filtration applications

Optimization of electro‐blown polysulfone nanofiber mats for air filtration applications

Aerosol Filtration Performance of Solution Blown PA6 Webs with Bimodal Fiber Distribution

Clogging performance of micro/nanofibrous laminated composite air filter media

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