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Force-distance profile between two e-beam evaporated silica films on mica substrates in ~0.5mM KNO3. Solid lines are electrostatic fits to the data using the Poisson-Boltzman (P-B) equation with constant surface potential ψ= −107mV and constant surface charge σ= −9.2mC/m2. D = 0 is defined as hard, flattened contact between the silica films (F/R>70mN/m) submerged in water. (Inset) Remaining steric force after subtracting the electrostatic contribution.
