The effect of capillary force on airborne nanoparticle filtration

Givehchi, Raheleh; Tan, Zhongchao

doi:10.1016/j.jaerosci.2015.02.001

Cited by 46 publications

(32 citation statements)

References 76 publications

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“…Moreover, for mechanical filters, the reviews for electret filters (charged filters) demonstrated the filtration performance decreases as humidity increases. The reason is that higher humidity would lead to the reduction in the charges on the filter's fiber and particles [ 82 ].…”

Section: Influence Of Different Parameters On the Penetrationmentioning

confidence: 99%

“…In this case the by increasing the loading time, the electrostatic attraction is decreased. Another mechanism, such as interception, was less influenced compared to the diffusion [ 82 ]. Loading time is also affected by the particle size, as for the larger size (higher than 100 nm), the penetration increased in the 2nd and 4th hour compared to the previous interval, although it has a slight decrease in 2 next hours.…”

Section: Influence Of Different Parameters On the Penetrationmentioning

confidence: 99%

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An overview of filtration efficiency through the masks: Mechanisms of the aerosols penetration

Tcharkhtchi

Abbasnezhad

Seydani

et al. 2021

Bioactive Materials

302

322

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The masks have always been mentioned as an effective tool against environmental threats. They are considered as protective equipment to preserve the respiratory system against the non-desirable air droplets and aerosols such as the viral or pollution particles. The aerosols can be pollution existence in the air, or the infectious airborne viruses initiated from the sneezing, coughing of the infected people. The filtration efficiency of the different masks against these aerosols are not the same, as the particles have different sizes, shapes, and properties. Therefore, the challenge is to fabricate the filtration masks with higher efficiency to decrease the penetration percentage at the nastiest conditions. To achieve this concept, knowledge about the mechanisms of the penetration of the aerosols through the masks at different effective environmental conditions is necessary. In this paper, the literature about the different kinds of face masks and respiratory masks, common cases of their application, and the advantages and disadvantages of them in this regard have been reviewed. Moreover, the related mechanisms of the penetration of the aerosols through the masks are discussed. The environmental conditions affecting the penetration as well as the quality of the fabrication are studied. Finally, special attention was given to the numerical simulation related to the different existing mechanisms.

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Section: Influence Of Different Parameters On the Penetrationmentioning

confidence: 99%

Section: Influence Of Different Parameters On the Penetrationmentioning

confidence: 99%

An overview of filtration efficiency through the masks: Mechanisms of the aerosols penetration

Tcharkhtchi

Abbasnezhad

Seydani

et al. 2021

Bioactive Materials

302

322

View full text Add to dashboard Cite

show abstract

“…Currently, we should note that air filtration is still the most promising technique for protection from nanoparticles contamination and harmful gasses in the atmosphere . For example, the filtration market will boost to an estimated US $700 billion by 2020 under estimate as reported by Huang et al Filtering exhibits the advantages of high purification efficiency and outstanding performance stability in varying application.…”

Section: Introductionmentioning

confidence: 99%

Electrospun Nanofibers Membranes for Effective Air Filtration

Zhu

Han

Wang

et al. 2016

Macromol. Mater. Eng.

497

352

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In modern society, traffic and transportation and the manufacturing industry and construction industries continuously release large amounts of dust and particles into the atmosphere, which can cause heavy air pollution, leading to health hazards. The haze disaster, a serious problem in developing countries such as China and India, has become one of the main issues of global environmental pollution in recent decades. Many air filtration technologies have been developed. Air filtration using electrospun fibers that intercept fine particles/volatile organic gases/bacterium is a relatively new, but highly promising, technique. Due to their interconnected nanoscale pore structures, highly specific surface areas, fine diameters, and porous structure as well as their ability to incorporate active chemistry on a nanoscale surface, electrospun fibers are becoming a promising versatile platform for air filtration. In this review, following a short introduction concerning the need for air filtration and filtration theory and mechanism, electrospun nanofibers membranes for air filtration have been highlighted, including the preparation (electrospinning process) and the parameters relevant to filtration efficacy. Additionally, various types (function) of the electrospun air filtration membranes have been classified in detail. Furthermore, their potential in the filtration of fine particles and chemical pollutants has been discussed. Finally, the challenges of their practical application and the future prospects have been summarized. Given that some advanced electrospun air filtration nanofibrous membranes exist for treating different contaminants from various types of polluted atmosphere, it is believed that they should make a significant contribution in protection against air pollution.

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“…Membrane filtration is nowadays considered to be the most efficient and reliable physical method for protection from air pollutants [5] but filters with low-pressure drop, high-quality factor, and antibacterial properties are still a challenge to be produced. According to Vinh and Kim [6], filters must be designed to be durable and effective, while maintaining a low-pressure drop, to display a long lifetime, to be easy to handle, to have low production cost and a small package space, and to be flexible for each specific demand.…”

Section: Introductionmentioning

confidence: 99%

Efficient nanoparticles removal and bactericidal action of electrospun nanofibers membranes for air filtration

Bortolassi

Nagarajan

Lima

et al. 2019

Materials Science and Engineering: C

173

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Human exposure to air pollution and especially to nanoparticles is increasing due to the combustion of carbon-based energy vectors. Fibrous filters are among the various types of equipment potentially able to remove particles from the air. Nanofibers are highly effective in this area; however, their utilization is still a challenge due to the lack of studies taking into account both nanoparticle collection efficiency and antibacterial effect. The aim of this work is to produce and evaluate novel silver/polyacrylonitrile (Ag/PAN) electrospun fibers deposited on a nonwoven substrate to be used as air filters to remove nanoparticles from the air and also showing antibacterial activity. In order to determine the optimum manufacturing conditions, the effects of several electrospinning process parameters were analyzed such as solution concentration, collector to needle distance, flow rate, voltage, and duration. Ag/PAN nanofibers were characterized by Xray diffraction (XRD), Transmission Electron Microscopy (TEM), Fourier Transform Infra-Red spectroscopy (FTIR), Energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and Scanning Electron Microscopy (SEM). In addition, filtration performances were determined by measuring the pressure drop and collection efficiency of sodium chloride (NaCl) aerosol particles (9 to 300 nm diameters) using Scanning Mobility Particle Sizers (SMPS). Filters with high filtration efficiency (≈100%) and high-quality factor (≈0.05 Pa -1 ) were obtained even adding different concentrations of Ag nanoparticles (AgNPs) to PAN nanofibers. The resultant Ag/PAN nanofibers showed excellent antibacterial activity against 10 4 CFU/ml E.coli bacteria.The crystallinity of the silver nanoparticles was analyzed using X-ray diffraction analysis and shown in Figure S1. The peak observed at 17° for the 0AgF samples corresponds to (110) plan of PAN. Crystalline peak corresponds to silver nanoparticles were absent in all samples (1AgF, 10AgF, and 50AgF) which is due to the small size (<5nm) of silver nanoparticles.

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The effect of capillary force on airborne nanoparticle filtration

Cited by 46 publications

References 76 publications

An overview of filtration efficiency through the masks: Mechanisms of the aerosols penetration

An overview of filtration efficiency through the masks: Mechanisms of the aerosols penetration

Electrospun Nanofibers Membranes for Effective Air Filtration

Efficient nanoparticles removal and bactericidal action of electrospun nanofibers membranes for air filtration

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