Sedimentation of self-propelled Janus colloids: polarization and pressure
We study experimentally—using Janus colloids—and theoretically—using Active Brownian Particles—the sedimentation of dilute active colloids. We first confirm the existence of an exponential density profile. We show experimentally the emergence of a polarized steady state outside the effective equilib...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2018-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/aae732 |
| _version_ | 1827873241313574912 |
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| author | Felix Ginot Alexandre Solon Yariv Kafri Christophe Ybert Julien Tailleur Cecile Cottin-Bizonne |
| author_facet | Felix Ginot Alexandre Solon Yariv Kafri Christophe Ybert Julien Tailleur Cecile Cottin-Bizonne |
| author_sort | Felix Ginot |
| collection | DOAJ |
| description | We study experimentally—using Janus colloids—and theoretically—using Active Brownian Particles—the sedimentation of dilute active colloids. We first confirm the existence of an exponential density profile. We show experimentally the emergence of a polarized steady state outside the effective equilibrium regime, i.e. when the sedimentation speed v _s is not much smaller than the propulsion speed v _0 . The experimental distribution of polarization is very well described by the theoretical prediction with no fitting parameter. We then discuss and compare three expressions which have been proposed to measure the pressure of sedimenting particles: the weight of particles above a given height, the flux of momentum and active impulse, and the force density measured by pressure gauges. |
| first_indexed | 2024-03-12T16:34:31Z |
| format | Article |
| id | doaj.art-735edb5bdfd94819b86b39ce512b89eb |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:34:31Z |
| publishDate | 2018-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-735edb5bdfd94819b86b39ce512b89eb2023-08-08T14:55:47ZengIOP PublishingNew Journal of Physics1367-26302018-01-01201111500110.1088/1367-2630/aae732Sedimentation of self-propelled Janus colloids: polarization and pressureFelix Ginot0https://orcid.org/0000-0001-9585-8613Alexandre Solon1https://orcid.org/0000-0002-0222-1347Yariv Kafri2Christophe Ybert3Julien Tailleur4https://orcid.org/0000-0001-6847-3304Cecile Cottin-Bizonne5https://orcid.org/0000-0001-5807-9215Ceramic Synthesis and Functionalization Lab , UMR3080 CNRS-Saint-Gobain, F-84306, Cavaillon, France; Univ. Lyon, Université Claude Bernard Lyon 1 , CNRS,UMR 5306, Institut Lumière Matière, F-69622, Villeurbanne, FranceDepartment of Physics, Massachusetts Institute of Technology , Cambridge, MA 02139, United States of AmericaDepartment of Physics, Technion , Haifa, 32000, IsraelUniv. Lyon, Université Claude Bernard Lyon 1 , CNRS,UMR 5306, Institut Lumière Matière, F-69622, Villeurbanne, FranceUniversité Paris Diderot , Sorbonne Paris Cité, MSC, UMR 7057 CNRS, F-75205, Paris, FranceUniv. Lyon, Université Claude Bernard Lyon 1 , CNRS,UMR 5306, Institut Lumière Matière, F-69622, Villeurbanne, FranceWe study experimentally—using Janus colloids—and theoretically—using Active Brownian Particles—the sedimentation of dilute active colloids. We first confirm the existence of an exponential density profile. We show experimentally the emergence of a polarized steady state outside the effective equilibrium regime, i.e. when the sedimentation speed v _s is not much smaller than the propulsion speed v _0 . The experimental distribution of polarization is very well described by the theoretical prediction with no fitting parameter. We then discuss and compare three expressions which have been proposed to measure the pressure of sedimenting particles: the weight of particles above a given height, the flux of momentum and active impulse, and the force density measured by pressure gauges.https://doi.org/10.1088/1367-2630/aae732sedimentationself-propelled colloidspolarization |
| spellingShingle | Felix Ginot Alexandre Solon Yariv Kafri Christophe Ybert Julien Tailleur Cecile Cottin-Bizonne Sedimentation of self-propelled Janus colloids: polarization and pressure New Journal of Physics sedimentation self-propelled colloids polarization |
| title | Sedimentation of self-propelled Janus colloids: polarization and pressure |
| title_full | Sedimentation of self-propelled Janus colloids: polarization and pressure |
| title_fullStr | Sedimentation of self-propelled Janus colloids: polarization and pressure |
| title_full_unstemmed | Sedimentation of self-propelled Janus colloids: polarization and pressure |
| title_short | Sedimentation of self-propelled Janus colloids: polarization and pressure |
| title_sort | sedimentation of self propelled janus colloids polarization and pressure |
| topic | sedimentation self-propelled colloids polarization |
| url | https://doi.org/10.1088/1367-2630/aae732 |
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