Airborne Fiber Separation by Electrophoresis and Dielectrophoresis: Theory and Design Considerations

Han, R. J.; Moss, Owen R.; Wong, B. A.

doi:10.1080/02786829408959713

Cited by 11 publications

(2 citation statements)

References 16 publications

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“…Further, through actinolite asbestos-based research, Yu found that the higher the aspect ratio, the more efficient electrification was [ 12 ]. Furthermore, Han et al (1994) showed that charged fibers with higher aspect ratios could be electrified more efficiently [ 22 ]. Similarly, Ku et al (2011) reported that CNT with a higher height-to-width aspect ratio was more efficient in electrification [ 7 ].…”

Section: Discussionmentioning

confidence: 99%

Real-time measurement of fibers using an HY-differential mobility analyzer with an optical particle counter (KOFAM)

Choi¹,

Jang

Park

et al. 2017

PLoS ONE

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This study investigated the applicability of an HY-differential mobility analyzer with an optical particle counter (HY-DMA/OPC), named as KOFAM, for counting fibrous matters in real time. Fibers separated from particles by the HY-DMA were counted with an OPC. To assess the KOFAM performance, the proposed method and the conventional gold standard phase contrast microscopy (PCM) method were compared in terms of variables such as recovery, relative difference, coefficient of determination, and conformity. The optimal sheath-to-aerosol (outlet) flow ratio of the internal flow in the HY-DMA was determined to be 1.6:1. In terms of recovery of the HY-DMA, the highest recovery was obtained at a voltage of 500 V regardless of which type of asbestos was tested. The recovery rate for serpentine was 45.5% and that for amphibole was 34.9%. The coefficients of determination of serpentine (R2 = 0.89) and amphibole (R2 = 0.87) were highly correlated. With respect to the coefficient of variation (CV), the KOFAM demonstrated superior performance over the M7400AD and F-1 methods and showed almost no difference from the PCM method (KOFAM: 22.5%, M7400AD: 32.4%, F-1: 88.8%, and PCM: 21.9%). There was no statistically significant difference between concentration measurements of the KOFAM and PCM analyses. Accordingly, it was concluded that the KOFAM can be used as a superior alternative to conventional fiber measurement methods. The preliminary results support the use of the KOFAM for constant measurement of airborne asbestos concentrations in real time.

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Section: Discussionmentioning

confidence: 99%

Real-time measurement of fibers using an HY-differential mobility analyzer with an optical particle counter (KOFAM)

Choi¹,

Jang

Park

et al. 2017

PLoS ONE

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show abstract

“…These results imply that the fiber classifier should not provide a separation of non-conductive fibers. However, it was found that a humidified environment Deye et al 1999;Han et al 1994) resulted in the classification of non-conductive fibers through the adsorption of water onto the fibers. Although fiber length classification had been achieved, the relationship between the humidity and the classification efficiency was not well defined.…”

Section: Introductionmentioning

confidence: 97%

Fiber Classification and the Influence of Average Air Humidity

Wang

Hopke

Baron

et al. 2005

Aerosol Science and Technology

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The use of man-made vitreous fibers (MMVFs) as a substitute for asbestos in industrial and residential applications has raised the concerns of the potential hazards associated with inhalable aerosolized fibers. The complex movement of fiber makes it difficult to predict the pattern of fiber deposition in human airways from the behavior of spherical particles. Difficulties in producing monodisperse length fibers has been an obstacle to study fibrous particle deposition in the human respiratory system. To address this problem, a narrow length distribution of fibers was generated using dielectrophoretic classification. Dielectrophoresis is the motion of neutral matter in a nonuniform electric field due to an induced dipole moment. It is sensitive to the conductivity of the matter in the field. A fiber classifier has been used to study the influence of atmospheric humidity on the behavior of glass fibers. Glass fibers, as insulators, can not be classified by the dielectrophoretic classifier. However, our study shows that a humidity higher than 15% RH can change the conductivity of the glass fibers so as to permit their effective classification.

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Design and use of a virtual impactor and an electrical classifier for generation of test fiber aerosols with narrow size distributions

Chen

Yeh

Johnson

1996

Journal of Aerosol Science

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Airborne Fiber Separation by Electrophoresis and Dielectrophoresis: Theory and Design Considerations

Cited by 11 publications

References 16 publications

Real-time measurement of fibers using an HY-differential mobility analyzer with an optical particle counter (KOFAM)

Real-time measurement of fibers using an HY-differential mobility analyzer with an optical particle counter (KOFAM)

Fiber Classification and the Influence of Average Air Humidity

Design and use of a virtual impactor and an electrical classifier for generation of test fiber aerosols with narrow size distributions

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