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Disjoining pressure, contact angles and line tension in free thin liquid films

1992; Elsevier BV; Volume: 40; Linguagem: Inglês

10.1016/0001-8686(92)80075-9

1873-3727

B. V. Toshev, Dimo Platikanov,

Adhesion, Friction, and Surface Interactions

Three are the main thermodynamic quantities which characterize the physical behaviour of the thin liquid films: the disjoining pressure, the macroscopic contact angle between the film and its adjacent bulk liquid phase, and the line tension of the film contact perimeter. All these quantities manifest the action of the long-range interaction surface forces which take place in any small capillary system. The rigorous introduction of such quantities is closely related to the Gibbs concept of surface of tension. For the case of a thin plane parallel liquid film there exist three surfaces of tension. By making use of them the thickness of the film would also be defined. There are several experimental methods for determining the tension of film, the contact angles. the line tension. Some important details of these methods. some experimental results together with important features of the thermodynamic theory of the thin liquid films are the subject of the present paper.