Filter efficiency as a function of nanoparticle velocity and shape

Boskovic, Lucija; Agranovski, Igor E.; Altman, Igor; Braddock, Roger David

doi:10.1016/j.jaerosci.2008.03.003

Cited by 39 publications

(16 citation statements)

References 17 publications

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“…The finding showed that spherical particles result in greater removal efficiency, followed by NaCl and MgO. The rounded corners or sharp edge of the NaCl particles cause them to roll or tumble, respectively, upon contact with the surface (Boskovic et al, 2008). Particle shape is thus a significant factor that affects filtration characteristics, dust cake formation, and filtration efficiency (Nazarboland et al, 2007).…”

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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“…Thus, we decided to determine the submicron sizeresolved penetration in a quite wide size range, between 20 and 400 nm. Second, in most of the papers (Steffens and Coury 2007a,b;Boskovic et al 2008;Cyrs et al 2010), only one or two filters (four in Wang et al 2006Wang et al , 2008also in Japuntich et al 2006) were investigated, while we have taken 20 of them into account, covering several types of filtration materials, pore sizes, pressure drops, etc. Our approach is similar to those in Liu and Lee (1976) but we did not focus only on membrane filters, but compared the fibrous filters as well.…”

Section: Introductionmentioning

confidence: 99%

Size-Resolved Penetration Through High-Efficiency Filter Media Typically Used for Aerosol Sampling

Zíková

Ondráček

Zdimal

2015

Aerosol Science and Technology

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We have developed a new, fully controlled filter testing device and have used it to measure size-resolved penetration through a typically used filtration media for (but not only) atmospheric aerosol sampling. Twenty membrane and fiber filter pieces (mixed cellulose ester filters, polytetrafluoroethylene filters, quartz fiber filters, glass fiber filters, and polycarbonate filters) of various manufacturers and filter codes were examined. High variability in the penetration curve shapes, most penetrating particle size (MPPS) (from 20 nm to 90 nm) and penetration maxima (from 0.001% to almost 100%) has been found. The dependence of pressure drop on face velocity generally agrees with theory, the comparison of penetration at various face velocities proved the theoretical equations being able to determine MPPS only partially correctly. Although the variability within an individual filter of the same code is not negligible, it is small compared to the differences between the various filter types. The results not only differed from the information provided by the manufacturers, but in many cases also provided information otherwise unavailable, although affecting the sampling and also the ability of comparison with theory. To have enough information for the proper choice of the filter for a given purpose, it would be necessary to have not only total penetration given from the DOP standard measurement, but the MPPS, penetration maximum value and pressure drop as well.

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“…Thus, it is expected that the filtration efficiency drops considerably at higher face velocity. Boskovic et al tested the filtration efficiency at various velocities ranging from 5 to 20 cm/s -1 for different shapes of particles (sphere, semi rounded and cubic) 38,53) . The measured particle size was in the range of 50-300 nm.…”

Section: Face Velocity and Airflow Ratementioning

confidence: 99%

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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Filter efficiency as a function of nanoparticle velocity and shape

Cited by 39 publications

References 17 publications

An Overview of Airborne Nanoparticle Filtration and Thermal Rebound Theory

An Overview of Airborne Nanoparticle Filtration and Thermal Rebound Theory

Size-Resolved Penetration Through High-Efficiency Filter Media Typically Used for Aerosol Sampling

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

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