An Electrical Suspension Method for Measuring the Electric Charge on Small Silicone Oil Droplets Dispersed in Aqueous Solutions

The ζ-Potential of Silicone Oil Droplets Dispersed in Aqueous Solutions

“…It is worthwhile to mention that several undesirable effects, such as the electroosmotic effect, the ohmic heating produced by the applied electric field, and the effect of electrode polarization, may be present in the experimental study. These effects were examined in detail previously (9). Some precautions were taken in order to minimize or, ideally, to eliminate the possible influence of these effects on the measured -potential.…”

“…Some precautions were taken in order to minimize or, ideally, to eliminate the possible influence of these effects on the measured -potential. Generally, all these effects can be minimized by properly reducing the strength and the duration of the applied electric field and/or by limiting the ionic concentration (9). In this paper, no electrolyte concentration higher than 10 Ϫ3 M or surfactant concentration higher than the critical micelle concentration (CMC) of the surfactant was tested.…”

“…A detailed description of the experimental apparatus and procedure was given in the previous paper (9).…”

“…An electrical suspension method was recently devised to measure the electric charge of small silicone oil droplets dispersed in aqueous solutions (9). The effects of varying oil phases, pH values, and electrolytes on the measured electric charge were studied.…”

Laundry Detergency of Solid Non-Particulate Soil Using Microemulsion-Based Formulation

“…In comparison among the studied formulation, in the absence of NaCl, the magnitude of the zeta potential of methyl palmitate particles was extremely high, due to the ester functional group in methyl palmitate being hydrolyzed into carboxyl and hydroxyl groups, as well as the adsorption of the anionic extended surfactant 7,8,34,35 . The zeta potential of the methyl palmitate particles became less negative with increasing NaCl concentrations, due to the compression of the double layer or reduction of Debye length next to the surface by the coadsorption of sodium ions from the added NaCl 36,37 .…”