Theoretical modeling of atomic force microscope indenter interaction with a liquid nanofilm on the surface of a sample

A theoretical modeling of atomic force microscope probe indentation into the liquid film on the surface of a sample is carried out. A conic probe with the opening angle 40 0 and bending radius 10 nm is examined. It is established theoretically that the boundary curvature of the liquid around the probe extends to a great distance from the contact area. Calculations show that the gravity of the liquid must be taken into account in description of appearing contact capillary. At nano level the gravity of liquid is significantly affected on capillary effects. Dependences of capillary forces acting on the probe when in contact with the liquid, on the depth of probe immersion were calculated using the proposed approach.