Improvement in nanofiber filtration by multiple thin layers of nanofiber mats

Zhang, Qi; Welch, James; Park, Hyoungjun; Wu, Chang‐Yu; Sigmund, Wolfgang M.; Marijnissen, J.C.M.

doi:10.1016/j.jaerosci.2009.10.001

Cited by 155 publications

(94 citation statements)

References 15 publications

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“…Zhang and his colleagues [54] postulate that semi-solid fibers rapidly discharge once they reach the target plate. However, when they are covered with other low conductivity layers, discharging process of bottom layers does not reach a proper completion.…”

Section: Polyvinyl Alcohol As An Auxiliary Polymermentioning

confidence: 99%

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A feasibility study on semi industrial nozzleless electrospinning of cellulose nanofiber

et al. 2015

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The current study focuses on the production of cellulose nanofiber through semi-industrial nozzleless electrospinning process. The cellulose biopolymer used for spinning process was extracted from rice straw as renewable, abundant, and inexpensive natural resource. The electrospinning device comprising one needle is extremely inefficient because of low productivity level of about 0.3 g/h. Thus, using the nozzleless electrospinning system guarantees the high productivity of nanofiber web for diverse applications. The successful electrospinning process is accomplished through systematic control of the surface tension, viscosity, and electric conductivity of aqueous solutions of cellulose. Moreover, a design expert software was used for providing experimental plan for the investigation of the influence of the operational conditions on the spinning properties of the selected solution. The polyvinyl alcohol with a weight ratio of 60 % relative to cellulose content was used as a biocompatible polymer to facilitate electrospinning process for producing the aqueous cellulose solution of 0.63 wt%. Based on the scanning electron microscopy images, and various selected parameters, namely, the drum rotation rate of 9 rpm, high voltage range of ±55 kV, the spinning temperature of 41°C, and 10-cm distance between drum and collector an average diameter of 89 ± 1 nm was arrived. The composite nanofibers used for filter production and their performance were evaluated by porosity analysis and permeability tests. Results show the negative impact of the weak mechanical strength as an obstacle in Penetration test. (It promotes by higher electrospinning time and reaching proper stiffness in web layer.) The permeability tests show a maximum value of 3.5 cm 3 /cm 2 /s at the maximum pressure of 120 Pa.

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Section: Polyvinyl Alcohol As An Auxiliary Polymermentioning

confidence: 99%

“…However, when they are covered with other low conductivity layers, discharging process of bottom layers does not reach a proper completion. The remaining charge finally causes low-stretched nanofiber and higher fiber diameter for higher nanofiber layer thickness [54].…”

Section: Polyvinyl Alcohol As An Auxiliary Polymermentioning

confidence: 99%

A feasibility study on semi industrial nozzleless electrospinning of cellulose nanofiber

et al. 2015

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“…Patanaik et al (2010) fabricated various polyethylene oxide (PEO) nanofibers through electrospinning and evaluated the interrelationships among the PEO concentration, the fiber morphology, and the filtration performance. Zhang et al (2010) recently examined the properties of filter media comprising multiple thin nanofiber layers. They found that such media exhibited much better filtration performance, in terms of the pressure drop, when compared with nanofiber membranes based on a single thick layer.…”

Section: Introductionmentioning

confidence: 99%

Polyacrylonitrile microscaffolds assembled from mesh structures of aligned electrospun nanofibers as high-efficiency particulate air filters

Kao

et al. 2016

Aerosol Science and Technology

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Electrospun polyacrylonitrile (PAN) fibers of very small diameters have potential for integration into filters capable of increasing the particle filtration efficiency. To fulfill the requirements for high-efficiency particulate air (HEPA) filters with a reasonable pressure drop, we generated aligned electrospun PAN fibers through pre-alignment at various rotation rates and subsequent solvent vapor annealing (SVA) under a loading. We evaluated the properties of microscaffold filters assembled from aligned electrospun PAN fibers in the form of linear, square, and triangular multiple meshes. The microscaffolds featuring multiple square meshes exhibited dramatically increased filtration efficiency without a significant pressure drop. A nine-layer cross-ply structure provided a filtration efficiency of 99.98% for 0.25-mm particles at a face velocity of 10 cm s ¡1 ; its filtration quality factor was the highest among all of the tested microscaffolds. Thus, HEPA filters featuring a low packing density can be achieved using PAN fibers.

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“…Wang et al (2008) investigated the performance of filters with a single nanofiber layer on a substrate and showed that nanofiber filters have better filtration performance for particles larger than approximately 100 nm compared with conventional filters. Podgórski et al (2006), Przekop and Grado (2008), Zhang et al (2010), and Leung et al (2010) also studied the filtration performance of filters with nanofibers coated on a substrate.…”

Section: Introductionmentioning

confidence: 99%

Filtration Performance of Dual-layer Filter Paper with Fibrillated Nanofibers

Yao¹,

Tang²,

Tian³

et al. 2016

BioResources

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a Filter paper can be dramatically improved by the slip-flow effect and the huge specific surface area of nanofibers. Nanofibers can provide significant improvement in filtration efficiency with a relatively small reduction in permeability. In this study, nanofiber was prepared by fibrillation method using para-aramid fiber. A lab method was developed to laminate the nanofiber layer on a paper substrate by a wet-laid method. The filtration performance of dual-layer filter paper with fibrillated nanofibers was evaluated, and a theoretical model was developed to study the impact of nanofiber diameter on the filtration properties. It is found that in the fibrillation process, the number of trunk fibers decreased and nanofibers increased. With smaller fiber diameter, the pressure drop and filtration efficiency of dual-layer filter paper increased. Based on fibrous structure analysis, the dual-layer filter paper was able to perform well in self-cleaning filtration. The modeling results for pressure drop and filtration efficiency were close to the tested results, which provide a tool to understand the relationship between nanofiber diameter and filtration performance.

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Improvement in nanofiber filtration by multiple thin layers of nanofiber mats

Cited by 155 publications

References 15 publications

A feasibility study on semi industrial nozzleless electrospinning of cellulose nanofiber

A feasibility study on semi industrial nozzleless electrospinning of cellulose nanofiber

Polyacrylonitrile microscaffolds assembled from mesh structures of aligned electrospun nanofibers as high-efficiency particulate air filters

Filtration Performance of Dual-layer Filter Paper with Fibrillated Nanofibers

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