Water-soluble filters from ultra-thin polyvinylpirrolidone nanofibers
Water soluble nanofilters (NF) to be used in the collection of biological micro- and nano-aerosols were manufactured by electrospinning polyvinylpyrrolidone (PVP) solutions in different solvent mixtures and neutralizing the electrospun PVP nanofibers with a cloud of small counter-ions generated by e...
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Veröffentlicht in: | Journal of membrane science 2013-12, Vol.448, p.151-159 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Water soluble nanofilters (NF) to be used in the collection of biological micro- and nano-aerosols were manufactured by electrospinning polyvinylpyrrolidone (PVP) solutions in different solvent mixtures and neutralizing the electrospun PVP nanofibers with a cloud of small counter-ions generated by electrospraying a volatile solvent. Nanofibers electrospun from 6.5% PVP solutions in 0.8/0.2 (w/w) ethanol/acetone, 0.8/0.2 ethanol/water, and 0.5/0.5 ethanol/dimethylformamide (DMFA) mixtures had major diameters of 255, 155, and 5nm, respectively. NF electrospun from PVP solution in the ethanol/DMFA mixture were almost transparent, and had the mass and the resistance to airflow less by a factor of 2–3 compared to the NF of similar aerosol-capturing efficiency but manufactured from the PVP solution in the ethanol/water mixture. The filtration properties of these two types of NF for sub-micron and nanoaerosol particles were characterized at a face velocity of air up to 13m/s. It was shown that deformation of nanomats by a pressure drop at high velocity resulted in decreased nanoaerosol penetration. It was demonstrated that NF attached to a household vacuum cleaner allowed aerosol to be collected at a flow rate of 0.4–0.7m3/min and transferred into a liquid probe as small as 20µL for further analysis.
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•Water-soluble filters were prepared from polyvinylpirrolidone.•Performance of filters with different fiber diameters is compared.•Penetration of nanoaerosols at high face velocity is studied. |
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ISSN: | 0376-7388 1873-3123 |
DOI: | 10.1016/j.memsci.2013.07.067 |