Critical voltages of film rupture were measured for different solvent mixtures and S/B ratios. For sake of relevance to the industrial applications, electric field was applied on draining films. The effect of film thickness (time of application of ramp potential) on critical voltage is reported. Experimental results are further discussed in relation to mechanism of film rupture and implications to the electro-induced coalescence.
Theoretical background: Effect of DC Polarization on film drainage and stability
Maxwell stress. Let us consider a dielectric layer with thickness h placed in aqueous electrolyte solution considered as ideal ...
... middle of paper ...
... capillary. To hold the oil phase, glass porous plate was converted to hydrophobic by treating it with solution of 20% dichlorodimenthylsilane in cyclohexene . Electric polarization across the film was applied by means of two platinum electrodes immersed in each compartment filled with aqueous electrolyte solution and connected to high accuracy, wide bandwidth potentiostate. Solartron Analytical 1287. Films were observed in reflected light with inverted microscope - Carl Zeiss Axio Observer. Intensity of the reflected light, required for determination of film thickness, were made with low noise Hamamatsu Si photodiode S8745-01. For image and video registration, high resolution/high sensitivity Leica DFC500 digital camera is used with QWin software for image analysis. More details on interferometric and pressure balance part of the instrument are given elsewhere 
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