Abstract
Measurements are presented of the electrical double layer and van der Waals forces between the (0001) surfaces of two single-crystal sapphire platelets immersed in an aqueous solution of NaCl at pH values from 6.7 to 11. The results fit the standard Deryaguin-Landau-Verwey-Overbeek (DLVO) theory, with a Hamaker constant of 6.7 × 10−20 J. These are the first measurements made using the Israelachvili surface forces apparatus without mica as a substrate material, and they demonstrate the possibility of using this technique to explore the surface chemistry of a wider range of materials.
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Horn, R.G., Clarke, D.R. & Clarkson, M.T. Direct measurement of surface forces between sapphire crystals in aqueous solutions. Journal of Materials Research 3, 413–416 (1988). https://doi.org/10.1557/JMR.1988.0413
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DOI: https://doi.org/10.1557/JMR.1988.0413