Filtration characteristics of a fibrous filter pretreated with anionic surfactants for monodisperse solid aerosols

Yang, Shu; Lee, Whei‐May Grace

doi:10.1016/j.jaerosci.2004.10.002

Cited by 45 publications

(24 citation statements)

References 26 publications

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“…In order to reduce the negative effects related to neutralization of electrets produced by corona discharge, works aimed at developing highly effective filtering materials with the use of other methods were carried out (Angadjivand, 1996;Carter et al, 1988;Jones et al, 2002;Nguyen 2005;Yang and Lee, 2005). Interesting results were obtained in case of low-temperature plasma treatment of polypropylene filtering nonwovens (Urbaniak-Domagała et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Influence of Low-Temperature Plasma Treatment on The Liquid Filtration Efficiency of Melt-Blown PP Nonwovens in The Conditions of Simulated Use of Respiratory Protective Equipment

Majchrzycka

Brochocka

Urbaniak–Domagała

2017

Chemical and Process Engineering

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Filtering nonwovens produced with melt-blown technology are one of the most basic materials used in the construction of respiratory protective equipment (RPE) against harmful aerosols, including bio-and nanoaerosols. The improvement of their filtering properties can be achieved by the development of quasi-permanent electric charge on the fibres. Usually corona discharge method is utilized for this purpose. In the presented study, it was assumed that the low-temperature plasma treatment could be applied as an alternative method for the manufacturing of conventional electret nonwovens for the RPE construction.Low temperature plasma treatment of polypropylene nonwovens was carried out with various process gases (argon, nitrogen, oxygen or air) in a wide range of process parameters (gas flow velocity, time of treatment and power supplied to the reactor electrodes). After the modification, nonwovens were evaluated in terms of filtration efficiency of paraffin oil mist. The stability of the modification results was tested after 12 months of storage and after conditioning at elevated temperature and relative humidity conditions. Moreover, scanning electron microscopy and ATR-IR spectroscopy were used to assess changes in surface topography and chemical composition of the fibres. The modification of melt-blown nonwovens with nitrogen, oxygen and air plasma did not result in a satisfactory improvement of the filtration efficiency. In case of argon plasma treatment, up to 82% increase of filtration efficiency of paraffin oil mist was observed in relation to untreated samples. This effect was stable after 12 months of storage in normal conditions and after thermal conditioning in (70 ± 3)°C for 24 h. The use of low-temperature plasma treatment was proven to be a promising improvement direction of filtering properties of nonwovens used for the protection of respiratory tract against harmful aerosols.

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Section: Introductionmentioning

confidence: 99%

Influence of Low-Temperature Plasma Treatment on The Liquid Filtration Efficiency of Melt-Blown PP Nonwovens in The Conditions of Simulated Use of Respiratory Protective Equipment

Majchrzycka

Brochocka

Urbaniak–Domagała

2017

Chemical and Process Engineering

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“…Otherwise, there was no clear indication that this parameter was linked to the filtration efficiency. The results from the regression showed that there was no definitive indication that temperature and relative humidity affected the filtration efficiency in these ranges, as Kim et al (2006) and Yang and Lee (2004) concluded. The regression for each filter is presented in the supplementary material.…”

Section: The Effect Of Temperature and Relative Humidity On Filtratiomentioning

confidence: 96%

“…Sachinidou et al (2017) concluded that particle size distribution and charge could possibly affect the filtration test accuracy. Kim et al (2006) and Yang and Lee (2004) showed that relative humidity did not influence the filtration efficiency. However, the charge status of the filter media could affect the filtration efficiency as stated by Brown (1993), Lore et al (2011).…”

Section: Introductionmentioning

confidence: 96%

Inter-Laboratory Validation of the Method to Determine the Filtration Efficiency for Airborne Particles in the 3-500 nm Range and Results Sensitivity Analysis

Sachinidou

Bahk

Tang

et al. 2017

Aerosol Air Qual. Res.

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The filtration of airborne nanoparticles is becoming an important issue as they are produced in large quantities from material synthesis and combustion emission. Current international standards dealing with efficiency test for filters and filter media focus on measurement of the minimum efficiency at the most penetrating particle size. The available knowledge and instruments provide a solid base for development of test methods to determine the effectiveness of filtration media for airborne nanoparticles down to a single-digit nanometer range.An inter-laboratory evaluation is performed under the Technical Committee 195 of European Committee for Standardization (CEN/TC195) for the development of the methodology to determine effectiveness of filtration media for airborne particles in the 3-500 nm range. Statistical analysis of the results was performed according to ISO 5725-2 in order to evaluate the test procedure and sensitivity analysis was carried out to identify the factors that could possibly affect the test results.Inter-laboratory analysis revealed some deviation among the experimental results. The statistical analysis showed a less than 20% deviation. This deviation could be attributed to the difference among the experimental setups used by the laboratories. The sensitivity analyses did not indicate a strong influence by the temperature, relative humidity, flow distribution, challenging particle concentration, or particle density on the filtration efficiency in the parameter ranges used in the inter-laboratory test. However, the charging status of the filter affected the filtration efficiency.

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“…Ikezaki et al and Lowkis et al also confirmed that the potential of the electret filters on the collections of the particles fell as the surface charge was decreased with the increase of RH 56,57) . Yang and Lee, however, reported that RH had no effect on the aerosol penetration through the electret filter for monodisperse NaCl particles ranging from 50 nm to 100 nm by showing that the aerosol penetration was almost the same at two RH of 30% and 70% 58) . Yang and Lee explained that other studies mainly charged the electret filters either by using corona or triboelectric charging methods.…”

Section: Humiditymentioning

confidence: 96%

Performance of Mechanical Filters and Respirators for Capturing Nanoparticles ―Limitations and Future Direction

et al. 2010

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There is an increasing concern about the health hazard posed to workers exposed to inhalation of nanoparticles. Inhaling nanoparticles posses an occupational hazard due to elevated amount emitted to the atmosphere and working environment. Nanoparticles have potential toxic properties: the high particle surface area, number concentration, and surface reactivity. Inhalation, the most common route of nanoparticle exposure, has been shown to cause adverse effects on pulmonary functions and the deposited particles in the lung can be translocated to the blood system by passing through the pulmonary protection barriers. Filtration is the simplest and most common method of aerosol control. It is widely used in mechanical ventilation and respiratory protection. However, concerns have been raised regarding the effectiveness of the filters for capturing nanoparticles. This paper reviews the literature on the filtration performance of mechanical filters and respirators against nanoparticles. It includes the discussion about filtration mechanisms, theoretical models, affecting factors of the filtration efficiency, and testing protocols for respirator and filter certification.

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Filtration characteristics of a fibrous filter pretreated with anionic surfactants for monodisperse solid aerosols

Cited by 45 publications

References 26 publications

Influence of Low-Temperature Plasma Treatment on The Liquid Filtration Efficiency of Melt-Blown PP Nonwovens in The Conditions of Simulated Use of Respiratory Protective Equipment

Influence of Low-Temperature Plasma Treatment on The Liquid Filtration Efficiency of Melt-Blown PP Nonwovens in The Conditions of Simulated Use of Respiratory Protective Equipment

Inter-Laboratory Validation of the Method to Determine the Filtration Efficiency for Airborne Particles in the 3-500 nm Range and Results Sensitivity Analysis

Performance of Mechanical Filters and Respirators for Capturing Nanoparticles ―Limitations and Future Direction

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