Abstract
In this work filtration efficiency of commercially available filter media with fiber/pore sizes of the scale of 10. μm is dramatically increased by not only adding electrospun nanofibers, as is usually done, but also a layer of ultrafine supersonically blown 20-50. nm nanofibers. Three different commercially available base filters were modified with (i) electrospun nanofibers alone, (ii) solution-blown 20-50. nm nanofibers alone, and (iii) the dual coating with electrospun nanofibers deposited first and the solution-blown 20-50. nm nanofibers deposited on top of them. Detailed observations of nanoparticle removal by these base and the above-mentioned modified filters revealed that the filters with dual electrospun nanofibers (deposited first) and the solution-blown 20-50. nm nanofibers deposited on top of them are the most effective in removing the below-200. nm Cu nanoparticles/clusters from aqueous suspensions. Experiments were conducted in two different time ranges: (a) for 8-15. s, and (b) for 8. min. It was found that the efficiency of the dual-coated filters containing 20-50. nm fibers was significantly higher than those of the others at the lowest nanoparticle concentrations of 0.2-0.5. ppm in suspension. The experiments conducted for longer time revealed that the smallest nanofibers were as efficient in particle retention as in the shorter-time experiments, and there was no visible breakage pattern of these nanofibers. The theory developed in the present work explains and describes how the smallest solution-blown nanofibers introduce a novel physical mechanism of nanoparticle interception (the attractive van der Waals forces) and become significantly more efficient collectors compared to the larger electrospun nanofibers. The theory predicts the domain of nanoparticle collection due to the van der Waals forces. The theory also elucidates the morphology of the nanoparticle clusters being accumulated at the smallest nanofiber surfaces, including the clusters growing at the windward side, or in some cases also on the leeward side of a nanofiber.
| Original language | English |
|---|---|
| Pages (from-to) | 132-150 |
| Number of pages | 19 |
| Journal | Journal of Membrane Science |
| Volume | 485 |
| DOIs | |
| Publication status | Published - 2015 Jul 1 |
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Keywords
- Filtration of nanoparticles
- Filtration theory
- Supersonic solution-blowing
- Ultrafine nanofibers
- Van der Waals forces
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Materials Science(all)
- Biochemistry
- Filtration and Separation
Cite this
Application of solution-blown 20-50nm nanofibers in filtration of nanoparticles : The efficient van der Waals collectors. / Sinha-Ray, Sumit; Sinha-Ray, Suman; Yarin, Alexander; Pourdeyhimi, Behnam.
In: Journal of Membrane Science, Vol. 485, 01.07.2015, p. 132-150.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Application of solution-blown 20-50nm nanofibers in filtration of nanoparticles
T2 - The efficient van der Waals collectors
AU - Sinha-Ray, Sumit
AU - Sinha-Ray, Suman
AU - Yarin, Alexander
AU - Pourdeyhimi, Behnam
PY - 2015/7/1
Y1 - 2015/7/1
N2 - In this work filtration efficiency of commercially available filter media with fiber/pore sizes of the scale of 10. μm is dramatically increased by not only adding electrospun nanofibers, as is usually done, but also a layer of ultrafine supersonically blown 20-50. nm nanofibers. Three different commercially available base filters were modified with (i) electrospun nanofibers alone, (ii) solution-blown 20-50. nm nanofibers alone, and (iii) the dual coating with electrospun nanofibers deposited first and the solution-blown 20-50. nm nanofibers deposited on top of them. Detailed observations of nanoparticle removal by these base and the above-mentioned modified filters revealed that the filters with dual electrospun nanofibers (deposited first) and the solution-blown 20-50. nm nanofibers deposited on top of them are the most effective in removing the below-200. nm Cu nanoparticles/clusters from aqueous suspensions. Experiments were conducted in two different time ranges: (a) for 8-15. s, and (b) for 8. min. It was found that the efficiency of the dual-coated filters containing 20-50. nm fibers was significantly higher than those of the others at the lowest nanoparticle concentrations of 0.2-0.5. ppm in suspension. The experiments conducted for longer time revealed that the smallest nanofibers were as efficient in particle retention as in the shorter-time experiments, and there was no visible breakage pattern of these nanofibers. The theory developed in the present work explains and describes how the smallest solution-blown nanofibers introduce a novel physical mechanism of nanoparticle interception (the attractive van der Waals forces) and become significantly more efficient collectors compared to the larger electrospun nanofibers. The theory predicts the domain of nanoparticle collection due to the van der Waals forces. The theory also elucidates the morphology of the nanoparticle clusters being accumulated at the smallest nanofiber surfaces, including the clusters growing at the windward side, or in some cases also on the leeward side of a nanofiber.
AB - In this work filtration efficiency of commercially available filter media with fiber/pore sizes of the scale of 10. μm is dramatically increased by not only adding electrospun nanofibers, as is usually done, but also a layer of ultrafine supersonically blown 20-50. nm nanofibers. Three different commercially available base filters were modified with (i) electrospun nanofibers alone, (ii) solution-blown 20-50. nm nanofibers alone, and (iii) the dual coating with electrospun nanofibers deposited first and the solution-blown 20-50. nm nanofibers deposited on top of them. Detailed observations of nanoparticle removal by these base and the above-mentioned modified filters revealed that the filters with dual electrospun nanofibers (deposited first) and the solution-blown 20-50. nm nanofibers deposited on top of them are the most effective in removing the below-200. nm Cu nanoparticles/clusters from aqueous suspensions. Experiments were conducted in two different time ranges: (a) for 8-15. s, and (b) for 8. min. It was found that the efficiency of the dual-coated filters containing 20-50. nm fibers was significantly higher than those of the others at the lowest nanoparticle concentrations of 0.2-0.5. ppm in suspension. The experiments conducted for longer time revealed that the smallest nanofibers were as efficient in particle retention as in the shorter-time experiments, and there was no visible breakage pattern of these nanofibers. The theory developed in the present work explains and describes how the smallest solution-blown nanofibers introduce a novel physical mechanism of nanoparticle interception (the attractive van der Waals forces) and become significantly more efficient collectors compared to the larger electrospun nanofibers. The theory predicts the domain of nanoparticle collection due to the van der Waals forces. The theory also elucidates the morphology of the nanoparticle clusters being accumulated at the smallest nanofiber surfaces, including the clusters growing at the windward side, or in some cases also on the leeward side of a nanofiber.
KW - Filtration of nanoparticles
KW - Filtration theory
KW - Supersonic solution-blowing
KW - Ultrafine nanofibers
KW - Van der Waals forces
UR - http://www.scopus.com/inward/record.url?scp=84926430371&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84926430371&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2015.02.026
DO - 10.1016/j.memsci.2015.02.026
M3 - Article
AN - SCOPUS:84926430371
VL - 485
SP - 132
EP - 150
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
SN - 0376-7388
ER -