We have numerically studied chemical potential per molecule in a thin liquid film enveloping an uncharged and charged spherical particle as a function of the external film radii. The analysis has been done within the frameworks of the gradient density functional approach with the van der Waals (for water) and Carnahan-Starling-Lennard-Jones (for non-polar substances) models for the bulk phases. The attractive surfaces potential contributions have been added to check the role of the particle wettability and the disjoining pressure effects.