Elastic correlation with coalescence

The effect of surface stretching elasticity (method due to Lunkenheimer) did not correlate with the measured coalescence inhibition. 

Biswas and Haydon [61] also found a striking effect of pH on the rigidity of the protein film. This is illustrated in Figure 6.37, where the shear modulus G and surface viscosity are plotted as a function of pH. The elasticity of the film is seen to be at a maximum at the isoelectric point of the protein. Biswas and Haydon then determined the rate of coalescence of petroleum ether drops at a planar O/W interface by measuring the lifetime of a droplet resting beneath the interface. The half-life of the droplets was plotted as a function of pH as shown in Figure 6.37, which clearly illustrates the correlation with G and... 

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