Dependence of the fiber diameter on quality factor of filters fabricated with meta-aramid nanofibers

Kim, Han Bin; Lee, Woojin; Choi, Sangchun; Lee, Ki Bong; Lee, Myong‐Hwa

doi:10.1016/j.seppur.2019.04.045

Cited by 30 publications

(6 citation statements)

References 39 publications

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“…To determine the surface charge density using equations ( 1) to ( 6), the collection efficiencies of uncharged particles for both charged and uncharged filters are necessary. Because it is difficult to obtain an uncharged filter with the same internal structure as the charged filter, the uncharged filter was prepared by exposing the electret filter to IPA droplets according to the methodology outlined by Kim et al [24], Xiao et al [25], and Sachindou et al [41]. Previous studies indicate that IPA plays a role in faster and more effective charge degradation than other organic solvents [25,42].…”

Section: Estimation Of Surface Charge Densitymentioning

confidence: 99%

“…4(b)). The reduction in collection efficiency was due to the loss of electrostatic force between the electret filter and the uncharged particles, which can be explained by the shift of the most penetrating particle size (MPPS) to 200 nm [14,24]. In other words, diffusion and dielectrophoretic force were the dominant collection mechanisms for uncharged particles in electret filtration, which caused a decrease in MPPS [43,44].…”

Section: Estimation Of Surface Charge Densitymentioning

confidence: 99%

“…Furthermore, IPA negatively affects the filtration performance of an electret filter in an air purifier. Kim et al reported a reduction in collection efficiency in an electrospun meta-aramid filter when exposed to IPA droplets [24]. It is well known that the decrease in collection efficiency is caused by electrostatic charge degradation [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Effect of surface charge density on electret filters charge degradation by organic solvent exposure

Lee

Kim

Eom

et al. 2022

Environmental Engineering Research

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The effect of the surface charge density of an electret filter on its collection efficiency degradation via isopropyl alcohol (IPA) species exposure is discussed in this study. Five electret filters with different electrostatic properties and identical physical properties were prepared and exposed to IPA species. Furthermore, the filtration performance was evaluated. Filters exposed to IPA droplets showed a drastic reduction in the collection efficiency. In addition, the electret filter with a higher surface charge density had a higher tolerance to IPA droplets, that is, the challenged IPA droplet amount that neutralized the electret filter with a high surface charge density (= 5.0 × 10 -5 C/m 2 ) was 2.5 times higher than that of an electret filter with a low surface charge density (= 1.9 × 10 -5 C/m 2 ). The results of this study revealed that there was a positive relationship between the surface charge density and challenged amount required to neutralize an electret filter.

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Section: Estimation Of Surface Charge Densitymentioning

confidence: 99%

Section: Estimation Of Surface Charge Densitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of surface charge density on electret filters charge degradation by organic solvent exposure

Lee

Kim

Eom

et al. 2022

Environmental Engineering Research

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“…The initial material effectiveness φ0 with nanofibres layer addition with a basis weight not exceeding gm=0.1 g/m 2 increases by 50%, with a slight increase in pressure drop Δp. There is a six-time increase in the filtration quality factor q determined by the formula [53]:…”

Section: Properties Of Nano Fibre Filtration Materialsmentioning

confidence: 99%

Material Properties Analysis with Addition of Nanofibres for Air Intake Filtration in Internal Combustion Engines

Dziubak¹

2021

IJAME

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The aim of this study is to provide an experimental properties evaluation of a standard filter material (cellulose) and materials with fiber layer addition with small diameters (nanofibers). Filter media, including cellulose, used in the internal combustion engine inlet air filtration are made of high diameter fibres, approx. 15 µm. Significantly higher separation and filtration efficiency performance are obtained for materials with lower fibre diameters (nanofibres), however, at the expense of a significantly higher pressure drop, affecting the engine performance. Filter media manufacturers mainly specify the structure parameters (pore size, air permeability and thickness), without giving any information on the dust filtration performance and rate. The literature includes test results for models of different filter media structures. Filtration process modelling using polydisperse dust with particles of different shape and density and irregular filter media structure is possible using advanced computer techniques, however, the process is complex and requires many simplifications. Test results can be applied directly in the automotive industry. The data can be obtained by experimental tests on filter medium specimens, complete filter elements or air filters which are costly and time-consuming tests, however, those test methods are the most reliable. Conditions and testing methodology for intake air filter materials used in internal combustion engines were developed. Filtration and flow resistance efficiency and accuracy were done depending on test dust mass stopped per unit area. Tested materials filtration efficiency was assessed by a filtration quality factor, which includes experimentally determined efficiency and accuracy as well as flow resistance values. Much higher efficiency and filtration accuracy of dust grains below 5 µm in filtration materials with nanofibers addition compared to standard filtration material (filter paper) were demonstrated. For the same flow resistance values, filter materials with nanofibers addition accumulate smaller dust mass than standard filter paper. Usage of materials with nanofibers addition used in motor vehicles intake air filtration ensures their high efficiency and accuracy. It minimises its components wear, but at the expense of faster flow resistance increase, which shortens filter life and increases filter replacement frequency. Results obtained during the experimental research partly fill the gap when it comes to the basic material properties used in internal combustion engines intake air filter partitions production.

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“…It has been widely used in the fields of protective apparatus 11 and catalytic materials, 12 and in the filtration industry. 13,14 It plays an irreplaceable role in high-temperature resistance applications. Commercial PMIA fibers can be fabricated by dry spinning, wet spinning and dry–wet spinning.…”

mentioning

confidence: 99%

Study on the performance characterization and yarn mechanical properties of poly-m-phenylene isophthalamide nanofiber

Wan-jin

Zhang

et al. 2021

Textile Research Journal

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In this paper, poly- m-phenylene isophthalamide (PMIA) staple fibers were dissolved in a LiCl/ N, N-dimethylacetamide solvent system in order to prepare PMIA nanofibers via the electrospinning method. The mean diameter of the nanofiber was between 72 and 247 nm and gradually increased with increasing LiCl concentration. PMIA nanofibers were characterized by scanning electron microscopy, Fourier transform infrared spectrometry, a thermogravimetric analyzer and Brunauer–Emmett–Teller analysis. Besides, the tensile strength of PMIA nanofiber yarns was tested and analyzed, combining the orthogonal array method. The results showed that the diameter and uniformity of nanofibers decreased gradually with increasing PMIA and LiCl solution concentration. The thermal properties, the specific surface area and chemical structures of PMIA nanofibers were improved comparing with PMIA stable fiber. It was found out that the LiCl concentration could influence the interactions among polymer molecules and caused the fibrils to wrap around each other, forming fiber clusters. The LiCl concentration was the most important factor affecting the tensile strength of PMIA nanofiber yarn.

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Dependence of the fiber diameter on quality factor of filters fabricated with meta-aramid nanofibers

Cited by 30 publications

References 39 publications

Effect of surface charge density on electret filters charge degradation by organic solvent exposure

Effect of surface charge density on electret filters charge degradation by organic solvent exposure

Material Properties Analysis with Addition of Nanofibres for Air Intake Filtration in Internal Combustion Engines

Study on the performance characterization and yarn mechanical properties of poly-m-phenylene isophthalamide nanofiber

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