Static and dynamic properties of the electrical double layer near amorphous silica: Relevance for device design

Bobo Shi, Hui Zhang, Ali Hassanali, Yun Kyung Shin, Chris Knight, Sherwin J. Singer

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    To explain why dynamical properties of an aqueous electrolyte near a charged surface seem to be governed by a surface charge less than the actual one, the canonical Stern model supposes an interfacial layer of ions and immobile fluid. However, large ion mobilities within the Stern layer are needed to reconcile the Stern model with surface conduction measurements. Modeling the aqueous electrolyte/amorphous silica interface at typical charge densities, a prototypical double layer system, the flow velocity does not vanish until right at the surface, yet electroosmotic flow far from the walls is in accord with the Stern model. The Stern model is a good effective model away from the surface, but cannot be taken literally near the surface. Indeed, simulations show no ion mobility where water is immobile, nor is such mobility necessary since the surface conductivity in the simulations is comparable to experimental values.

    Original languageEnglish (US)
    Title of host publicationNanotechnology 2012
    Subtitle of host publicationElectronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012
    Pages665-668
    Number of pages4
    StatePublished - Aug 17 2012
    EventNanotechnology 2012: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012 - Santa Clara, CA, United States
    Duration: Jun 18 2012Jun 21 2012

    Publication series

    NameTechnical Proceedings of the 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012

    Conference

    ConferenceNanotechnology 2012: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational - 2012 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2012
    CountryUnited States
    CitySanta Clara, CA
    Period6/18/126/21/12

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites
    • Surfaces, Coatings and Films

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