Direct measurement of surface forces between sapphire crystals in aqueous solutions
Source abstract
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.
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Research context
OpenAlex topics: Experimental and Theoretical Physics Studies · Force Microscopy Techniques and Applications · Adhesion, Friction, and Surface Interactions
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