Effect of Charge Inversion on Electroosmotic Transport in Nanochannels

Andrés Rojano*, Diego Becerra, Jens Honore Walther, Harvey A. Zambrano

*Corresponding author for this work

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    Abstract

    The employment of electroosmosis in nanofluidic pores holds great potential for biotechnological applications. Hence, a complete understanding of the transport properties of nanoconfined multivalent electrolytes is key to enable electrokinetics as driving mechanism in nanodevices. Here, Non-equilibrium Molecular Dynamics (NEMD) simulations are conduced to study phenomena related to the presence of charge inversion in electrolytes confined in nanopores. In particular, we perform NEMD simulations of electroosmotic transport of multivalent electrolyte solutions in silica nanochannels. The solutions consist of water, chlorine as co-ion and different amounts of counter-ions i.e. sodium, magnesium and aluminum. The electroosmotic velocities are computed for different applied electric fields and magnitudes of inverted charge. Furthermore, we compute friction coefficient, zeta potential, water ordering and interfacial and bulk diffusivities and viscosities. We find that overscreening related to interfacial charge inversion modifies the electrokinetic driving force and shear stress near the walls. Our results suggest that due to charge inversion, zeta potential and water ordering are altered which induces flow reversal.
    Original languageEnglish
    Publication date2020
    Number of pages1
    Publication statusPublished - 2020
    Event73rd Annual Meeting of the American Physical Society, Division of Fluid Dynamics (APS DFD 2020) - Virtual event, Chicago, United States
    Duration: 22 Nov 202024 Nov 2020

    Conference

    Conference73rd Annual Meeting of the American Physical Society, Division of Fluid Dynamics (APS DFD 2020)
    LocationVirtual event
    Country/TerritoryUnited States
    CityChicago
    Period22/11/202024/11/2020

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