Effect of charge inversion on Poiseuille flow of multivalent electrolyte solutions in nanochannels: an atomistic study

Andres Rojano, Andrés Córdoba, Jens H. Walther, Harvey A. Zambrano

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    Abstract

    Miniaturized devices integrated by nanoconduits have a great potential for clinical and biotechnological analysis due to amplified sensibility, faster response and increased portability. In nanoconduits, wherein the electrical double layer can occupy a considerable part of the cross section, Electro-Kinetic Phenomena (EKP) play a key role in determining transport properties of electrolytes. Hence, a comprehensive understanding of EKP and related phenomenology such as charge inversion (CI), is essential to develop more efficient nanodevices. Here, atomistic simulations of Poiseuille flow of aqueous multivalent electrolyte solutions in silica nanochannels are conducted to study the influence of CI on fluid properties. The solutions consist of water as solvent, chloride as co-ion and different amounts of counter-ions i.e. sodium, magnesium, aluminum and calcium. From atomistic trajectories, the relation between the concentration of different cations and, local and effective viscosities is analyzed considering the particular hydration shell around each ionic species. Moreover, the effect of CI on flow velocity, stick boundary condition, shear stress and friction coefficient is examined.
    Original languageEnglish
    Publication date2018
    Number of pages1
    Publication statusPublished - 2018
    Event71st Annual Meeting of the APS Division of Fluid Dynamics - Georgia World Congress Center , Atlanta, United States
    Duration: 18 Nov 201820 Nov 2018

    Conference

    Conference71st Annual Meeting of the APS Division of Fluid Dynamics
    LocationGeorgia World Congress Center
    Country/TerritoryUnited States
    CityAtlanta
    Period18/11/201820/11/2018

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