Capillary Sorting of Particles by Dip Coating
In this letter, we describe the capillary sorting of particles by size based on dip coating. A substrate withdrawn from a liquid bath entrains a coating whose thickness depends on the withdrawal speed and the liquid properties. If the coating material contains particles, they will only be entrained...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society (APS)
2021
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| Online Access: | https://hdl.handle.net/1721.1/133006 |
| _version_ | 1826196954705559552 |
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| author | Dincau, BM Bazant, Martin Z Dressaire, Emilie Sauret, Alban |
| author2 | Massachusetts Institute of Technology. Department of Chemical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Chemical Engineering Dincau, BM Bazant, Martin Z Dressaire, Emilie Sauret, Alban |
| author_sort | Dincau, BM |
| collection | MIT |
| description | In this letter, we describe the capillary sorting of particles by size based on dip coating. A substrate withdrawn from a liquid bath entrains a coating whose thickness depends on the withdrawal speed and the liquid properties. If the coating material contains particles, they will only be entrained when the viscous force pulling them with the substrate overcomes the opposing capillary force at the deformable meniscus. This force threshold occurs at different liquid thicknesses for particles of different sizes. Here, we show that this difference can be used to separate small particles from a mixed suspension through capillary filtration. In a bidisperse suspension, we observe three distinct filtration regimes. At low capillary numbers, Ca, no particles are entrained in the liquid coating. At high Ca, all particle sizes are entrained. For a range of capillary numbers between these two extremes, only the smallest particles are entrained while the larger ones remain in the reservoir. We explain how this technique can be applied to polydisperse suspension. We also provide an estimate of the range of capillary number to separate particles of given sizes. The combination of this technique with the scalability and robustness of dip coating makes it a promising candidate for high-throughput separation or purification of industrial and biomedical suspensions. |
| first_indexed | 2024-09-23T10:40:13Z |
| format | Article |
| id | mit-1721.1/133006 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:40:13Z |
| publishDate | 2021 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1330062022-09-30T22:09:42Z Capillary Sorting of Particles by Dip Coating Dincau, BM Bazant, Martin Z Dressaire, Emilie Sauret, Alban Massachusetts Institute of Technology. Department of Chemical Engineering Massachusetts Institute of Technology. Department of Mathematics In this letter, we describe the capillary sorting of particles by size based on dip coating. A substrate withdrawn from a liquid bath entrains a coating whose thickness depends on the withdrawal speed and the liquid properties. If the coating material contains particles, they will only be entrained when the viscous force pulling them with the substrate overcomes the opposing capillary force at the deformable meniscus. This force threshold occurs at different liquid thicknesses for particles of different sizes. Here, we show that this difference can be used to separate small particles from a mixed suspension through capillary filtration. In a bidisperse suspension, we observe three distinct filtration regimes. At low capillary numbers, Ca, no particles are entrained in the liquid coating. At high Ca, all particle sizes are entrained. For a range of capillary numbers between these two extremes, only the smallest particles are entrained while the larger ones remain in the reservoir. We explain how this technique can be applied to polydisperse suspension. We also provide an estimate of the range of capillary number to separate particles of given sizes. The combination of this technique with the scalability and robustness of dip coating makes it a promising candidate for high-throughput separation or purification of industrial and biomedical suspensions. 2021-10-15T19:11:45Z 2021-10-15T19:11:45Z 2019-07 2019-03 2019-08-14T13:17:26Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/133006 Dincau, BM, Bazant, Martin Z, Dressaire, E and Sauret, A. 2019. "Capillary Sorting of Particles by Dip Coating." Physical Review Applied, 12 (1). en 10.1103/physrevapplied.12.011001 Physical Review Applied Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society (APS) APS |
| spellingShingle | Dincau, BM Bazant, Martin Z Dressaire, Emilie Sauret, Alban Capillary Sorting of Particles by Dip Coating |
| title | Capillary Sorting of Particles by Dip Coating |
| title_full | Capillary Sorting of Particles by Dip Coating |
| title_fullStr | Capillary Sorting of Particles by Dip Coating |
| title_full_unstemmed | Capillary Sorting of Particles by Dip Coating |
| title_short | Capillary Sorting of Particles by Dip Coating |
| title_sort | capillary sorting of particles by dip coating |
| url | https://hdl.handle.net/1721.1/133006 |
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