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Direct measurement of surface forces between sapphire crystals in aqueous solutions

Published online by Cambridge University Press:  31 January 2011

R. G. Horn ,
D. R. Clarke  and
M. T. Clarkson
R. G. Horn
Affiliation:
Department of Applied Mathematics, Research School of Physical Sciences, Australian National University, GPO Box 4, Canberra, Australia.
D. R. Clarke
Affiliation:
Thomas J. Watson Research Center, IBM Research Division, Yorktown Heights, New York 10598
M. T. Clarkson
Affiliation:
Department of Applied Mathematics, Research School of Physical Sciences, Australian National University, GPO Box 4, Canberra, Australia
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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.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 3 , Issue 3 , June 1988 , pp. 413 - 416
Copyright
Copyright © Materials Research Society 1988

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References

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