ABSTRACT
Because the increase in the electrostatic force of repulsion is inversely proportional to the distance between the two surfaces, the force was gradually increased with the thinning of the foam film. This repulsion force would prevent further thinning when a certain thickness was reached in the foam film, and the rupture would occur with further elongation. We described the relationship between the magnitude of this repulsive force and the thickness of the foam film in the previous section (Sec. III-D).
