期刊
JOURNAL OF AEROSOL SCIENCE
卷 105, 期 -, 页码 128-144出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jaerosci.2016.12.002
关键词
Passive bioaerosol sampler; Passive sampler design and development; Polarized ferroelectric polymer film; Electrostatic particle collection
类别
资金
- United States Environmental Protection Agency's STAR (Science to Achieve Results) Graduate Fellowship [FP-91760601-0]
- Air and Waste Management Association's Milton Feldstein Memorial Scholarship for Air Quality Research
Passive samplers are needed to collect bioaerosols over broad spatiotemporal scales. Here, we present the design and development process of a novel, passive bioaerosol sampler using polarized, ferroelectric polymer film (poly(vinylidene fluoride), PVDF). First, the elution efficiencies of spiked bacteria and fungal spores from PVDF, prototype film holder materials (3D-printed plastics), and controls (PTFE filters and electrostatic dust cloths) were investigated. Second, a wind tunnel was used to determine optimal air channel widths between parallel sheets of PVDF for efficient collection of charge neutralized and non-charge neutralized test particles in viral, bacterial and fungal size ranges flowing with typical indoor air velocities. Particle collection efficiencies were then compared for PVDF, a PVDF copolymer (77% PVDF, 23% TrFE) and control materials (polyvinylchloride and polyfluoroalkoxy alkane). Third, a calm air settling chamber was used for proof of concept tests. Spiked microorganisms were removed with 100% elution efficiency from the PVDF and 3D-print materials. PVDF gave significantly greater collection efficiency (similar to 30%) when using air channel widths of 2.25 mm compared to other tested widths (p < 0.001). Compared to control materials, PVDF gave 13% to 30% greater collection efficiencies across all tested particle size ranges for charge neutralized and non-charge neutralized particles (p < 0.001). In the calm air chamber, a spiral film prototype sampler with poled PVDF provided a greater than six-fold increase in captured bacterial quantity compared to gravimetric settling onto a 25 mm reference filter (p < 0.05). This passive sampler concept offers many benefits compared to other active and passive bioaerosol samplers: small size and portability, increased bioaerosol collection compared to controls, capture of all bioaerosol particle sizes including nano-sized particles, expedited particle elution, and easy sampler production by 3D-printing. The next stage of research will be outdoor field testing to determine the collection efficiency for culturable and non-culturable samples.
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