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Revisiting Experimental tests of the Laplace-Kelvin Equation

Published online by Cambridge University Press:  10 February 2011

Frank Van Swol  and
Laura J. Douglas Frink
Frank Van Swol
Affiliation:
P.O. Box 5800, MS 1111, Sandia National Laboratory, Albuquerque, NM 87185–1111
Laura J. Douglas Frink
Affiliation:
P.O. Box 5800, MS 1111, Sandia National Laboratory, Albuquerque, NM 87185–1111
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Abstract

In this paper we focus on two experimental techniques for testing predictions made by Laplace-Kelvin theory (LKT). The first technique employs the surface forces apparatus (SFA) to measure pull-off forces, the second uses a beam bending (BB) technique to determine the bending forces in a microporous film produced with a sol-gel technique. We use density functional theory (DFT) to analyze the two experiments. We find that the pull-off force in a crossed cylinder geometery contains a minimal solid-liquid contribution, which can explain why the LKT result is found at saturation. We demonstrate that a pore size distribution essential to produce a bending stress that is always compressive and has a dependence on the vapor pressure that coincides with LKT.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 464: Symposium FF – Dynamics in Small Confining Systems III , 1996 , 159
Copyright
Copyright © Materials Research Society 1997

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References

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