Flow-Induced Surface Charge Heterogeneity in Electrokinetics due to Stern-Layer Conductance Coupled to Reaction Kinetics

Physical Review Letters
B L WerkhovenR van Roij

Abstract

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 charge-regulating 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)SCIEAS0036-807510.1126/science.1253793].

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Citations

Mar 15, 2019·Physical Chemistry Chemical Physics : PCCP·Cheng LianJianzhong Wu
Jan 16, 2020·Soft Matter·Ben L Werkhoven, René van Roij
Sep 1, 2019·The Journal of Chemical Physics·Paolo MalgarettiJ Miguel Rubi
Dec 20, 2018·The European Physical Journal. E, Soft Matter·Timothée Mouterde, Lydéric Bocquet
Aug 4, 2020·Physical Review Letters·Miha Ravnik, Jeffrey C Everts
Feb 16, 2021·ACS Nano·Pallab BasuriThalappil Pradeep
Jul 20, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yuki Uematsu
Aug 20, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Babak KashirAlexander L Yarin
Sep 30, 2021·Science Advances·Jean ComtetAleksandra Radenovic
Oct 3, 2021·Scientific Reports·Clodomiro Cafolla, Kislon Voïtchovsky
Jul 4, 2021·Nature Communications·Patrick OberMischa Bonn
Dec 1, 2021·Physical Chemistry Chemical Physics : PCCP·Zhicheng YeHonglai Liu

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