Filtration of nano-aerosol using nanofiber filter under low Peclet number and transitional flow regime

Hung, Chi-Ho; Leung, Wallace Woon‐Fong

doi:10.1016/j.seppur.2011.03.008

Cited by 253 publications

(129 citation statements)

References 13 publications

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“…In recent years, a number of studies have been conducted with the goal of determining the filtration efficiency of nanofiber filters (Podgórski et al, 2006;Qin and Wang, 2006;Yun et al, 2007;Wang et al, 2008;Hung and Leung, 2011). For example, Podgórski et al (2006) employed fibrous filters that were composed of microfibers and nanofibers, with the mean fiber diameter varying from 0.74 µm to 1.41 µm, and that were produced by means of a melt-blown method for removing nanoparticles with diameters in the range of 10 nm to 500 nm in diameter.…”

Section: Advances In Nanoparticle Filtration Efficiencymentioning

confidence: 99%

An Overview of Airborne Nanoparticle Filtration and Thermal Rebound Theory

Givehchi

Tan

2014

Aerosol Air Qual. Res.

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This paper provides an overview of recent studies on the filtration of airborne nanoparticles. Classical filtration theory assumes that the efficiency of nanoparticle adhesion is at unity when nanoparticles strike a filter with a Brownian motion. However, it has been pointed out that small nanoparticles may have a sufficiently high impact velocity to rebound from the surface upon collision, a mechanism called thermal rebound. According to thermal rebound theory, the adhesion efficiency of nanoparticles decreases if their size is reduced. However, this phenomenon has not yet been clearly observed in experimental studies; there are still a number of uncertainties associated with the concept of thermal rebound, which is yet to be either proven or disproven. This review paper discusses the findings in the current literature related to thermal rebound theory.

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Section: Advances In Nanoparticle Filtration Efficiencymentioning

confidence: 99%

An Overview of Airborne Nanoparticle Filtration and Thermal Rebound Theory

Givehchi

Tan

2014

Aerosol Air Qual. Res.

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“…The curves show general agreement with the respective experimental results while the estimated pressure drops have a discrepancy less than 11% from the experimental values. The modeled curves are close to each other for particles bigger than 100 nm, since the aerosol velocity affects the filtration efficiency of diffusion much more than that of interception (Hung and Leung 2011). …”

Section: Filtration Tests At Different Face Velocitiesmentioning

confidence: 54%

Filtration Performance Against Nanoparticles by Electrospun Nylon-6 Media Containing Ultrathin Nanofibers

Kuo

Bruno

Wang

2014

Aerosol Science and Technology

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We investigate the formation of ultrathin nanofibers (UNFs) with diameters below 20 nm by electrospinning Nylon-6 solution with various processing parameters. It is found that the UNF density and morphology are highly dependent on the solution concentration and age, collecting distance, and ambient humidity. The sequence that ribbon-like fibers are stretched by the electric force, followed by rapid phase separation of the splitting film is proposed as a formation mechanism of the UNFs. Based on the morphological study, a model of hexagonal nets is developed in order to estimate the filtration efficiency by the UNF structure. The estimated efficiency due to the UNFs is then combined with the contribution from the un-split nanofibers (NFs) to compute the total filtration efficiency and pressure drop for each of the electrospun media by applying a layered multiple zone model. The filtration performance of the electrospun media against nanoparticles is evaluated using the quality factor and specific filtration performance index, weighed against the pressure drop and basis weight of the media, respectively. Our results show UNFs are advantageous when high filtration efficiency is required and low weight is desired and/or little space is available for the filter media.

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“…In our research, the initial charged TPFs most efficiently removed particles at 2% TiO 2 loading, and the particle penetration (20-500 nm) was 1.83%. The increased efficiency may be attributed to the additional TiO 2 content on the TPFs, and TiO 2 potentially enhances the material surface area and provides additional active adsorption sites for particle removal (Hung et al, 2011). Surface roughness also allows the formation of an enlarged nonslip zone and expands the stagnation zone (Lamb et al, 1975).…”

Section: Effect Of Tio 2 Loadingmentioning

confidence: 99%

Deciphering Effects of Surface Charge on Particle Removal by TiO2 Polyacrylonitrile Nanofibers

Zhang¹,

Liu²,

Yang³

et al. 2017

Aerosol Air Qual. Res.

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Over the recent years, the continued increase in the number of particles in air has become a public concern. This problem can be addressed by using nanofibers to filter fine particles. However, nanofibers possess complex characteristics. As such, the effects of surface charge require further studies. In this study, the surface voltages of nanofibers were analyzed with an electrometer after these fibers were charged through corona discharge to investigate the mechanism of filtration. Results indicated that the surface voltage of 2.0% TiO 2 polyacrylonitrile fibers (TPFs) can reach up to 0.97 kV and then decrease to 0.60 kV after 96 h. Particles were optimally removed by charged polyacrylonitrile fibers (PFs) and TPFs. Particle penetration decreased by 71% of TPF and 36% of PF. Scanning Electron Microscopy and Nitrogen adsorption/desorption isotherms revealed that increasing the surface area and roughness of these materials are more favorable for charge maintenance to promote particle removal. Our research could provide an in-depth understanding of the effects of surface charge on particle removal and show how systems can be optimized for further applications.

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Filtration of nano-aerosol using nanofiber filter under low Peclet number and transitional flow regime

Cited by 253 publications

References 13 publications

An Overview of Airborne Nanoparticle Filtration and Thermal Rebound Theory

An Overview of Airborne Nanoparticle Filtration and Thermal Rebound Theory

Filtration Performance Against Nanoparticles by Electrospun Nylon-6 Media Containing Ultrathin Nanofibers

Deciphering Effects of Surface Charge on Particle Removal by TiO2 Polyacrylonitrile Nanofibers

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