Direct Measurements of Pseudoemulsion Film Rupture Pressures

3 Direct Measurements of Pseudoemulsion Film Rupture Pressures 

The basic principle of the application and measnranent of pressures with the FTT is shown schematically in Hgure 2.15. A capillary is inserted into a small trough of antifoam oil-in-water emnlsion and pressed against the base of the trough so that hydrostatic connection between the liqnid trapped in the capillary and that outside 

FIGURE 2.16 Diagram illustrating experimental setup for FTT. (Reprinted with permission from Denkov, N.D., Langmuir, 20, 9463. Copyright 2004 American Chemical Society.) 

As the pressure increases in the capillary, the trapped drop deforms and the pseu-doanulsion film thins. If the build up of the applied pressure, P pp, is slow, a condition of mechanical equilibrium will prevail so that the disjoining pressure in the 

---