Electret properties of polypropylene fabrics

Lowkis, B; Motyl, E.

doi:10.1016/s0304-3886(01)00053-5

Cited by 40 publications

(21 citation statements)

References 3 publications

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“…The reason is that higher humidity would lead to the reduction in the charges on the filter's fiber and particles. 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) .…”

Section: Humiditymentioning

confidence: 84%

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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Section: Humiditymentioning

confidence: 84%

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

et al. 2010

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“…Segundo Lowkis e Motyl (2001), as partículas carregadas têm a trajetória desviada quando passam pelo campo elétrico gerado pelas fibras elétricas. Já as partículas neutras são polarizadas e movem-se no sentido do campo elétrico.…”

Section: Filtraçãounclassified

A influência da temperatura na eficiência de filtros com carga eletrostática usados na proteção respiratória

Pastore

Iramina

2009

Rev. bras. saúde ocup.

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ResumoO uso de filtros e respiradores contra particulados é extremamente comum na indústria em geral. As normas utilizadas para a avaliação desses equipamentos definem critérios de testes e aprovação que visam garantir que os filtros continuem eficientes ao longo do tempo. Fatores como tipo, tamanho, velocidade, carga da partícula e temperatura são, em geral, considerados nos testes de aprovação. O objetivo deste artigo foi verificar o comportamento de filtros para particulados tipo eletreto usados em respiradores, expostos às condições térmicas semelhantes às encontradas em ambiente de trabalho. Simularamse, em laboratório, a temperatura e o tempo de exposição a que os mesmos podem estar sujeitos, medindo e comparando os resultados obtidos no sentido de atenderem as recomendações normativas, tanto nacionais como internacionais. Filtros e peças faciais de diferentes fabricantes foram expostos a diferentes temperaturas, sendo mantidos nestas por, no mínimo, 24 horas. Testes de penetração utilizando vazão de 85 l/min e partículas de NaCl, da ordem de 0,3 a 0,6 μm, que são consideradas as Partículas de Tamanhos Mais Penetrantes (MPPS), foram realizados antes e depois de cada período de exposição. A menor e a maior variações encontradas foram de 2,53% até 18%, respectivamente. Palavras-chave: filtro mecânico, partícula, eletrostático, segurança, equipamento de proteção individual. Abstract Particle filters are very commonly used in industries in

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“…These results are not consistent with those published elsewhere (Ackley, 1982;Moyer and Stevens, 1989), in which the aerosol penetration through the electret filter increased as RH increased. The surface charge reduced as the humidity increased (Ikezaki et al, 1995;Łokis and Motyl, 2001). Those electret filters were charged by corona charging or triboelectric charging.…”

Section: Effect Of Dielectric Constant Of Aerosol On Aerosol Penetrationmentioning

confidence: 99%

“…Ginestet and Pugnet (1997) found that the initial aerosol penetration of the electret filter for the solid aerosol is higher than that for liquid aerosol. Other works have demonstrated that increasing the relative humidity (RH) may reduce the collection efficiency of electret filters (Ackley, 1982 Ikezaki et al (1995) and Łokis and Motyl (2001) also noted that the surface potential of an electret filter fell as the RH increased. Typically, the electret filters are charged by three main processes, including corona charging, triboelectric charging and charging by induction (Brown, 1993).…”

Section: Introductionmentioning

confidence: 99%

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

Yang

Lee

2005

Journal of Aerosol Science

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Electret properties of polypropylene fabrics

Cited by 40 publications

References 3 publications

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

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

A influência da temperatura na eficiência de filtros com carga eletrostática usados na proteção respiratória

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

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