Dielectric Properties of W/O Emulsions Under Flow

Abstract

Water-in-oil model emulsions with various amounts of the aqueous phase. i.e. 24 to 74 % by volume and with 4% NaCl, have been characterized by means of time domain dielectric measurements in the frequency region 50 MHz to 2 GHz. The measurements were carried out in a flow loop which made it possible to do the characterization of the emulsions both under flow and at rest. The flowing emulsions show in general lower static permittivities than the corresponding emulsions at rest. The dielectric data are explained by models involving a flocculation of the aqueous droplets. The result indicate just a small deviation from sphericity of the formed floes.

Percolation Behavior in W/O Emulsions Stabilized by Interfacially Active Fractions from Crude Oils in High External Electric Fields

“…Skodvin et al have solved the Boyle and Boned mechanism. At these electric fields the permittivity starts to equations numerically (29). They studied the influence of increase more rapidly and the electrolyte is under influence the shape factor of the aggregates on the dielectric parame-of a strong polarization.…”

Distribution of Macropores in Silica Particles Prepared by Using Multiple Emulsions

“…In our study, considering the external phase (W/O 2 emulsion) of the multiple emulsion, this system consists of a nonionic surfactant (Span 80), water, oil, and HPC polymer, where we can produce very stable water-oil emulsions under the appropriate conditions (21,22). Above all, we need to start from an oil-continuous emulsion as matrix.…”

Emulsions Characterized by Means of Time Domain Dielectric Measurements (Tds). Technical Applications

“…This process is called flocculation, and the degree of flocculation in an emulsion plays an important role on the dielectric properties of the dispersed system [15][16][17][18][19]. The floes represent sub-volumes where the concentration (or volume fraction) of the disperse phase is higher than the overall concentration.…”