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Oscillatory Solvation Forces: A Comparison of Theory and

Summary: Oscillatory Solvation Forces: A
Comparison of Theory and
Phil Attard and John L. Parker
Department of Applied Mathematics,
Research School of Physical Sciences and Engineering,
Australian National University,
Canberra, A.C.T., Australia, 2601.
J. Phys. Chem. 96, 5086­5093 (1992).
Measurements are reported for the oscillatory force be­
tween mica surfaces in octamethyltetracyclosiloxane (OM­
CTS). Improved experimental resolution is achieved by
solid­state distance control and force measurement, and
by an automated data acquisition system. The period of
the oscillations is measured to be 0:82 \Sigma :02nm. Theoret­
ical calculations are shown to quantitatively describe the
magnitude of the force in the case of hard­sphere and of
Lennard­Jones models of the OMCTS molecule, with the
period being 0.74nm and 0.78nm respectively. A rigorous


Source: Attard, Phil - School of Chemistry, University of Sydney


Collections: Chemistry