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Effect of Surface Roughness and Electrostatic Surface Potentials on Forces Between Dissimilar Surfaces in Aqueous Solution

Authors

  • Markus Valtiner,

    1. Department of Chemical Engineering, University of California Santa Barbara (UCSB), CA-93106–5080, Santa Barbara, USA
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  • Kai Kristiansen,

    1. Department of Chemical Engineering, University of California Santa Barbara (UCSB), CA-93106–5080, Santa Barbara, USA
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  • George W. Greene,

    1. Department of Chemical Engineering, University of California Santa Barbara (UCSB), CA-93106–5080, Santa Barbara, USA
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  • Jacob N. Israelachvili

    Corresponding author
    1. Department of Chemical Engineering, University of California Santa Barbara (UCSB), CA-93106–5080, Santa Barbara, USA
    • Department of Chemical Engineering, University of California Santa Barbara (UCSB), CA-93106–5080, Santa Barbara, USA.
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Abstract

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The first surface force measurements under electrochemical potential control between a metal and a ceramic surface across a liquid medium (water) are reported. Our experiments also investigate and reveal how increasing levels of surface roughness and dissimilarity between the potentials of the interacting surfaces influence the strength and range of electric double layer, van der Waals, hydration, and steric forces and how this contributes to deviations from DLVO theory at small distances within aqueous solution.

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