Abstract
The theory of adhesion of fluid particles relating the adhesive force ƒ a* between them to the parameters of the disjoining pressure isotherm Π( H) and the particle radius R is suggested. It has been shown the validity of the relationship ƒ a*=νπ RΔ F( H f) in which Δ F( H f) is the specific interaction free energy in the liquid film of thickness H f and the parameter ν varies within the range 0.5 ⩽ ν ⩽ 1 being a function of the parameters of Π( H)-isotherm and the particle size. It has been demonstrated that the relationships ƒ a* 0.5 π RΔ F f (where Δ F f is the average value of the interaction free energy of the circular film of radius r f) is independent of the form of Π( H) -isotherm and valid for all particle radii. It has been shown that the work of the pull-off force, separating two fluid particles, may substantially increase (10 3 times and more) with decreasing the capillary pressure and the “radius” of action of surface forces, the adhesive force ƒ a* being maintained constant.
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