Flow-induced surface charge heterogeneity in electrokinetics due to Stern-layer conductance coupled to reaction kinetics

Werkhoven, B. L. (avtor), Everts, Jeffrey Christopher (avtor), Samin, S. (avtor), Roij, R. van (avtor)

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)].

• Jezik: Angleški jezik
• Ključne besede: electrokinetics, surface phenomena, hydrodynamics
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Založnik: American Physical Society
• Leto izida: 2018
• Št. strani: Str. 264502-1-264502-6
• Številčenje: Vol. 120, iss. 26
• PID: 20.500.12556/RUL-101750
• UDK: 537.36
• ISSN pri članku: 0031-9007
• DOI: 10.1103/PhysRevLett.120.264502
• COBISS.SI-ID: 3210852
• Datum objave v RUL: 03.07.2018

Gradivo je del revije

• Naslov: Physical review letters
• Skrajšan naslov: Phys. rev. lett.
• Založnik: American Physical Society
• ISSN: 0031-9007
• COBISS.SI-ID: 1282575

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: elektrokinetika, površinski pojavi, hidrodinamika

Projekti

• Financer: EC - European Commission
• Program financ.: H2020
• Številka projekta: 795377
• Naslov: Topological Colloidal Double Layers
• Akronim: TCDL