Direct measurement of surface forces between sapphire crystals in aqueous solutions
- 1 June 1988
- journal article
- Published by Springer Nature in Journal of Materials Research
- Vol. 3 (3) , 413-416
- https://doi.org/10.1557/jmr.1988.0413
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 atpH values from 6.7 to 11. The results fit the standard Deryaguin-Landau-Verwey-Overbeek (DLVO) theory, with a Hamaker constant of 6.7 × 10−20J. 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.Keywords
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