Flow-induced surface charge heterogeneity in electrokinetics due to Stern-layer conductance coupled to reaction kinetics
Werkhoven, B. L. (Author), Everts, Jeffrey Christopher (Author), Samin, S. (Author), Roij, R. van (Author)

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We theoretically study the electrokinetic problem of a pressure-induced liquid flow through a narrow long channel with charged walls, going beyond the classical Helmholtz-Schmolukowski picture by considering the surprisingly strong combined effect of (i) Stern-layer conductance and (ii) dynamic chargeregulating rather than fixed surface charges. We find that the water flow induces, apart from the well-known streaming potential, also a strongly heterogeneous surface charge and zeta potential on chemically homogeneous channel walls. Moreover, we identify a novel steady state with a nontrivial 3D electric flux with 2D surface charges acting as sources and sinks. For a pulsed pressure drop our findings also provide a first-principles explanation for ill-understood experiments on the effect of flow on interfacial chemistry [D. Lis et al., Science 344, 1138 (2014)].

Keywords:electrokinetics, surface phenomena, hydrodynamics
Tipology:1.01 - Original Scientific Article
Organization:FMF - Faculty of Mathematics and Physics
Publisher:American Physical Society
Number of pages:Str. 264502-1-264502-6
Numbering:Vol. 120, iss. 26
ISSN on article:0031-9007
DOI:10.1103/PhysRevLett.120.264502 This link opens in a new window
COBISS.SI-ID:3210852 This link opens in a new window
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Record is a part of a journal

Title:Physical review letters
Shortened title:Phys. rev. lett.
Publisher:American Physical Society
COBISS.SI-ID:1282575 This link opens in a new window

Document is financed by a project

Funder:EC - European Commission
Funding Programme:H2020
Project no.:795377
Name:Topological Colloidal Double Layers

Secondary language

Keywords:elektrokinetika, površinski pojavi, hidrodinamika

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