Liquid flow reversibly creates a macroscopic surface charge gradient

Patrick Ober; Willem Q. Boon; Marjolein Dijkstra; Ellen H.G. Backus; René van Roij; Mischa Bonn

doi:10.1038/s41467-021-24270-x

Liquid flow reversibly creates a macroscopic surface charge gradient

Patrick Ober, Willem Q. Boon, Marjolein Dijkstra, Ellen H.G. Backus, René van Roij^*, Mischa Bonn^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

The charging and dissolution of mineral surfaces in contact with flowing liquids are ubiquitous in nature, as most minerals in water spontaneously acquire charge and dissolve. Mineral dissolution has been studied extensively under equilibrium conditions, even though non-equilibrium phenomena are pervasive and substantially affect the mineral-water interface. Here we demonstrate using interface-specific spectroscopy that liquid flow along a calcium fluoride surface creates a reversible spatial charge gradient, with decreasing surface charge downstream of the flow. The surface charge gradient can be quantitatively accounted for by a reaction-diffusion-advection model, which reveals that the charge gradient results from a delicate interplay between diffusion, advection, dissolution, and desorption/adsorption. The underlying mechanism is expected to be valid for a wide variety of systems, including groundwater flows in nature and microfluidic systems.

Original language	English
Article number	4102
Number of pages	11
Journal	Nature Communications
Volume	12
Issue number	1
DOIs	https://doi.org/10.1038/s41467-021-24270-x
Publication status	Published - 2 Jul 2021

Bibliographical note

Funding Information:
P.O. gratefully acknowledges financial support by the Max Planck Graduate Center with the Johannes Gutenberg University Mainz (MPGC). All authors acknowledge the technical support of Marc-Jan van Zadel particularly the design of the flow cell. All authors thank anonymous Reviewer 2 for pointing us to relevant literature on diffuse boundary layer theory. This work is part of the D-ITP consortium, a program of the Netherlands Organisation for Scientific Research (NWO) that is funded by the Dutch Ministry of Education, Culture and Science (OCW).

Publisher Copyright:
© 2021, The Author(s).

Funding

P.O. gratefully acknowledges financial support by the Max Planck Graduate Center with the Johannes Gutenberg University Mainz (MPGC). All authors acknowledge the technical support of Marc-Jan van Zadel particularly the design of the flow cell. All authors thank anonymous Reviewer 2 for pointing us to relevant literature on diffuse boundary layer theory. This work is part of the D-ITP consortium, a program of the Netherlands Organisation for Scientific Research (NWO) that is funded by the Dutch Ministry of Education, Culture and Science (OCW).

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title = "Liquid flow reversibly creates a macroscopic surface charge gradient",

abstract = "The charging and dissolution of mineral surfaces in contact with flowing liquids are ubiquitous in nature, as most minerals in water spontaneously acquire charge and dissolve. Mineral dissolution has been studied extensively under equilibrium conditions, even though non-equilibrium phenomena are pervasive and substantially affect the mineral-water interface. Here we demonstrate using interface-specific spectroscopy that liquid flow along a calcium fluoride surface creates a reversible spatial charge gradient, with decreasing surface charge downstream of the flow. The surface charge gradient can be quantitatively accounted for by a reaction-diffusion-advection model, which reveals that the charge gradient results from a delicate interplay between diffusion, advection, dissolution, and desorption/adsorption. The underlying mechanism is expected to be valid for a wide variety of systems, including groundwater flows in nature and microfluidic systems.",

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AU - Bonn, Mischa

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Liquid flow reversibly creates a macroscopic surface charge gradient

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