Figure 4

Example of a measurement in hexadecane where a measured repulsive force (F) is observed on approach with the corresponding gaseous layer thicknesses (t): (a) F as a function of separation D zoomed-in on the repulsive part, (b) t observed directly underneath the particle at the corresponding separation. The error bars show the standard deviation at each point. The piezo expansion rate was 0.2 µm s⁻¹.