Mysels cell

To overcome these limitations, the porous plate technique, also called Mysels cell , was introduced by Mysels [446, 769]. It was further improved by Exerowa and... 

The type and magnitude of frequency dependence upon measured resistance depends upon the design of the conductance cell. Generally, measured resistance decreases with increasing frequency, although the opposite effect is observed in some cases with Erlenmeyer-type cells 21>2S>. Mysels et al. 2S> analyze this effect and extrapolate to zero frequency on a plot of resistance vs. f 2. 

In order to understand the nature of surface forces which characterise the thermodynamic state of black foam films as well as to establish the CBF/NBF transition, their direct experimental determination is of major importance. This has been first accomplished by Exerowa et al. [e.g. 171,172] with the especially developed Thin Liquid Film-Pressure Balance Technique, employing a porous plate measuring cell (see Section 2.1.8). This technique has been applied successfully by other authors for plotting 11(A) isotherms of foam films from various surfactants solutions [e.g. 235,260,261]. As mentioned in Chapter 2, Section 2.1.2, the Pressure Balance Technique employing the porous ring measuring cell has been first developed by Mysels and Jones [262] for foam films and a FI(A) isotherm was... 

Changes in thickness of foam films with time were studied in the works by K.J. Mysels, J. Perrin, A. Sheludko, B.V. Deryaguin, H. Zonntag and others. [21-25] Such studies are typically carried out with individual films or microfilms using an experimental cell designed by K.J. Mysels and A. Sheludko et al. (Fig. VIII-4) [26-29], The cell is first filled with foamer solution. Before the droplet appears at the bottom of the cell, the solution is sucked out with a micropump connected to a side outlet. As a result, meniscuses are formed... 

Methods based on studies of individual foam and emulsion films, for example, using a Mysels-Sheludko cell. 

The disjoining pressures in thin foam films can be as high as 30 kPa (0.3 bar). Such pressures cannot be applied using devices like that shown in Figure 2.8. They can, however, be applied directly to a foam film contained in a cylindrical cell prepared from a porous frit where the menisci in the fine holes in the latter determine the maximum capillary pressure in the Plateau border. In this approach, pressure on the film is directly applied by increasing the surrounding gas pressure. In turn, this produces an enhanced capillary pressure in the liquid trapped in the pores of the frit, presumably as the liquid moves to smaller pore radii. This technique was first used by Mysels and Jones [40] and later refined by Exerowa and Scheludko [41],... 

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