Self-diffusiophoresis of Janus particles in near-critical mixtures
| hal.structure.identifier | Laboratoire Ondes et Matière d'Aquitaine [LOMA] | |
| dc.contributor.author | WÜRGER, Aloïs | |
| dc.date.created | 2015-03-16 | |
| dc.date.issued | 2015-10-29 | |
| dc.identifier.issn | 0031-9007 | |
| dc.description.abstractEn | We theoretically study the self-propulsion of a laser-heated Janus particle in a near critical water-lutidine mixture, and relate its velocity vp and squirmer parameter β to the wetting properties of its two hemispheres. For non-ionic surface forces, the particle moves the active cap at the front, whereas a charged hydrophilic cap leads to backward motion, in agreement with experiment. Both vp and β show non-monotonic dependencies on the heating power, and may even change sign. The variation of β is expected to strongly affect the collective behavior of dense squirmer systems. PACS numbers 05.70.Ln; 66.10.C-; 82.70.-Dd PACS numbers: In recent years, artificial microswimmers have been realized by Janus particles which move along the concentration or temperature gradients generated by their own chemical or thermal activity [1–5]. Oriented autonomous motion has been achieved throug dynamical feedback [6] or rectification in a periodically structured channel [7], opening applications such as targeted transport and pumping of passive particles. In dense systems, active Janus particles aggregate in dynamical clusters [8, 9]. This observation was related to short-range hydro-dynamic effects [10–12], in terms of the squirmer model originally developed for the motility of bacteria. Self-propulsion mechanisms have generally a strong diffusio-phoretic component [13, 14]; in the case of ionic molecular solutes, self-generated electric fields and ion effects may contribute to the motion [15, 16]. Diffusiophoresis was first rationalized by Derjaguin et al. [17], when observing that wax particles dispersed in a non-uniform glucose solution, migrate toward lower sugar concentration. Because of its unfavorable interaction with wax (u > 0), sugar is depleted in the boundary layer, the adsorption parameter Γ = ∞ 0 | |
| dc.description.sponsorship | Effets thermoélectriques à l'échelle nano - ANR-13-IS04-0003 | |
| dc.language.iso | en | |
| dc.publisher | American Physical Society | |
| dc.rights.uri | http://creativecommons.org/licenses/by-sa/ | |
| dc.subject.en | diffusiophoresis | |
| dc.subject.en | Janus particles | |
| dc.subject.en | Colloids | |
| dc.subject.en | Nonequilibrium and irreversible thermodynamics | |
| dc.subject.en | Diffusion and thermal diffusion | |
| dc.subject.en | active particles | |
| dc.title.en | Self-diffusiophoresis of Janus particles in near-critical mixtures | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1103/PhysRevLett.115.188304 | |
| dc.subject.hal | Physique [physics]/Matière Condensée [cond-mat]/Matière Molle [cond-mat.soft] | |
| dc.identifier.arxiv | 1504.01522 | |
| bordeaux.journal | Physical Review Letters | |
| bordeaux.page | 188304 (1-5) | |
| bordeaux.volume | 115 | |
| bordeaux.issue | 18 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | ineris-01223147 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//ineris-01223147v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Physical%20Review%20Letters&rft.date=2015-10-29&rft.volume=115&rft.issue=18&rft.spage=188304%20(1-5)&rft.epage=188304%20(1-5)&rft.eissn=0031-9007&rft.issn=0031-9007&rft.au=W%C3%9CRGER,%20Alo%C3%AFs&rft.genre=article |
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