Line Tensions and Antifoam Behavior of Oil Lenses

Aveyard and Clint [85] have analyzed the consequences of the presence of a significant line tension on the behavior of lenses for the role of liquid drops in the rupture of thin liquid films and hence in foam breaking. They note, for example, that Equation 4.35 indicates that a sufficiently high positive value for x could mean that the equilibrium entry coefficient becomes negative for small drops in the case 

FIGURE 4.21 Relation of line tension, t, to Neumann s triangle in oil lens where R is radius of the line at three-phase contact line. 

Experimental Values of Line Tensions for Oil Lenses at Water-Air Surfaces 

Water on air-hexadecane surface Condensation of supersaturated hexadecane vapor onto air-water surface by adiabatic compression None +8 X 10- [87] 

NaCl solution lenses using interference microscopy 5 + 10-  

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