Abstract
A molecular theory based on the nonlocal density functional theory is used to calculate the solvation-force oscillations in nonpolar liquids observed with an atomic-force microscope (AFM) and a surface-force apparatus (SFA) operated within liquid. The fluid–fluid as well as wall–fluid interactions are represented by a Lennard–Jones type potential, whose parameters are related to the Hamaker constant. The density functional calculation shows that a stronger wall–fluid than fluid–fluid interaction is necessary to observe this solvation-force oscillation. The magnitude of the Hamaker constants of various nonpolar organic liquids and various substrates shows that this criterion for the observation of oscillation is normally satisfied.
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