Electrokinetic sweeping of colloids at a reactive magnesium oxide interface
| Autor: | Oriane Bonhomme, Li Fu, Anne-Laure Biance, Christophe Ybert, Laurent Joly |
|---|---|
| Přispěvatelé: | Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Liquides et interfaces (L&I), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Optique non linéaire et interfaces (ONLI), Modélisation de la matière condensée et des interfaces (MMCI), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), ANR-16-CE06-0004,NECtAR,Interfaces réactives pour la conversion d'énergie nanofluidique(2016) |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Tracking (particle physics) 01 natural sciences Charged particle 0104 chemical sciences Ion Reaction rate Electrokinetic phenomena Colloid Chemical physics Diffusiophoresis Zeta potential [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] 0210 nano-technology [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] |
| Zdroj: | Soft Matter Soft Matter, Royal Society of Chemistry, In press, ⟨10.1039/D1SM00908G⟩ |
| ISSN: | 1744-6848 1744-683X |
| Popis: | International audience; Investigating the electrokinetic (EK) response in the vicinity of interfaces has regained interest due to the development of new membrane based processes for energy harvesting or soil depollution. However, the case of reactive interfaces, ubiquitous in these processes, remains scarcely explored. Here we experimentally investigate the EK response of a model interface between an aqueous electrolyte and a bulk MgO crystal surface (100), for different pH. For that purpose, we use a lab-scale non invasive method to monitor the zeta potential of the interface versus time, by confocal fluorescent particle tracking. An unexpected motion of the particles, repelled and then attracted again by the interface is observed. We attributed this motion to the surface reactivity, inducing ion concentration gradients perpendicular to the interface and subsequent diffusiophoresis of the charged particle. Accordingly, we could describe at a semi-quantitative level the particle dynamics by solving numerically the Poisson–Nernst–Planck equations to establish concentration profile in the system and subsequent diffusiophoretic motion. These experiments open the way to the characterization of both the EK response and the reaction rate in the vicinity of reactive interfaces. |
| Databáze: | OpenAIRE |
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