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Vilquin A, Bertin V, Raphaël E, Dean DS, Salez T, McGraw JD. Nanoparticle Taylor Dispersion Near Charged Surfaces with an Open Boundary. PHYSICAL REVIEW LETTERS 2023; 130:038201. [PMID: 36763385 DOI: 10.1103/physrevlett.130.038201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 10/10/2022] [Accepted: 12/20/2022] [Indexed: 06/18/2023]
Abstract
The dispersive spreading of microscopic particles in shear flows is influenced both by advection and thermal motion. At the nanoscale, interactions between such particles and their confining boundaries become unavoidable. We address the roles of electrostatic repulsion and absorption on the spatial distribution and dispersion of charged nanoparticles in near-surface shear flows, observed under evanescent illumination. The electrostatic repulsion between particles and the lower charged surface is tuned by varying electrolyte concentrations. Particles leaving the field of vision can be neglected from further analysis, such that the experimental ensemble is equivalent to that of Taylor dispersion with absorption. These two ingredients modify the particle distribution, deviating strongly from the Gibbs-Boltzmann form at the nanoscale studied here. The overall effect is to restrain the accessible space available to particles, which leads to a striking, tenfold reduction in the spreading dynamics as compared to the noninteracting case.
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Affiliation(s)
- Alexandre Vilquin
- Gulliver UMR 7083 CNRS, PSL Research University, ESPCI Paris, 10 rue Vauquelin, 75005 Paris, France
- IPGG, 6 rue Jean-Calvin, 75005 Paris, France
| | - Vincent Bertin
- Gulliver UMR 7083 CNRS, PSL Research University, ESPCI Paris, 10 rue Vauquelin, 75005 Paris, France
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France
- Physics of Fluids Group, Faculty of Science and Technology, and Mesa+Institute, University of Twente, 7500AE Enschede, Netherlands
| | - Elie Raphaël
- Gulliver UMR 7083 CNRS, PSL Research University, ESPCI Paris, 10 rue Vauquelin, 75005 Paris, France
| | - David S Dean
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France
- Team MONC, INRIA Bordeaux Sud Ouest, CNRS UMR 5251, Bordeaux INP, Univ. Bordeaux, F-33400 Talence, France
| | - Thomas Salez
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France
| | - Joshua D McGraw
- Gulliver UMR 7083 CNRS, PSL Research University, ESPCI Paris, 10 rue Vauquelin, 75005 Paris, France
- IPGG, 6 rue Jean-Calvin, 75005 Paris, France
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Meng X, Yang D. Determination of dynamic dispersion coefficients for passive and reactive particles flowing in a circular tube. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.04.030] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Sadeghi A, Amini Y, Saidi MH, Chakraborty S. Numerical modeling of surface reaction kinetics in electrokinetically actuated microfluidic devices. Anal Chim Acta 2014; 838:64-75. [DOI: 10.1016/j.aca.2014.05.023] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 04/03/2014] [Accepted: 05/13/2014] [Indexed: 10/25/2022]
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Pagitsas M, Brenner H. Convective–diffusive macrotransport processes in the presence of an inhomogeneous volumetric chemical reaction: Perturbation expressions for the effective reaction and transport coefficients in terms of comparable nonreactive properties. J Chem Phys 1990. [DOI: 10.1063/1.459535] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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