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Open AccessFeature PaperArticle

Multi-Scale Microstructure Investigation for a PM2.5 Air-Filter Efficiency Study of Non-Woven Polypropylene

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Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan
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Department of Physics, College of Education, Can Tho University, Can Tho City 900100, Vietnam
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Institute of Applied Mechanics, National Taiwan University, 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
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Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University, No. 17, Xu-Zhou Rd., Taipei 10055, Taiwan
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National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
*
Authors to whom correspondence should be addressed.
Quantum Beam Sci. 2019, 3(4), 20; https://doi.org/10.3390/qubs3040020
Received: 29 August 2019 / Revised: 18 October 2019 / Accepted: 24 October 2019 / Published: 28 October 2019
A N95 face-piece respirator and a 3M air filter composed of non-woven polypropylene filter material were investigated for their multi-scale microstructure and resulting filtration performance. Filtration mechanisms of each system are found and quantified. Both media showed a gradually decrease of the most penetrating particle size with respect to an increase in face velocity or surface charge density. Increasing the face velocity and porosity dramatically degraded the collection efficiency in the 3M filter rather than in the N95 system. We exploited three-dimensional X-ray tomography to characterize the morphological and geometrical properties of the fiber arrangement and deposition of aerosol on the fiber surface. Tuning the most predominant material parameters to achieve a precedence in lower pressure drop or higher collection efficiency in a specifically captured particle size range is of great requisite to a peculiar application of the filter media. View Full-Text
Keywords: fibrous filter; electret filter; aerosol; porosity; X-ray tomography fibrous filter; electret filter; aerosol; porosity; X-ray tomography
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MDPI and ACS Style

Lam, T.-N.; Wu, C.-H.; Huang, S.-H.; Ko, W.-C.; Huang, Y.-L.; Ma, C.-Y.; Wang, C.-C.; Huang, E.-W. Multi-Scale Microstructure Investigation for a PM2.5 Air-Filter Efficiency Study of Non-Woven Polypropylene. Quantum Beam Sci. 2019, 3, 20.

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