Ion Injection in Dielectric Liquids from the Surface of Aqueous Solutions

• Main Authors: Vasilkov, Sergei, Balymbetov, Arman
• Format: Conference Proceeding
• Language: English
• Subjects: charge injection; Chlorine compounds; current-voltage characteristics; Electrodes; Impurities; liquid dielectrics; Low voltage; Oils; Sodium; two-phase liquids; Water; water electrode
• ISSN: 2153-3733
• DOI: 10.1109/ICDL49583.2022.9830975

One can manipulate two-phase fluids using an electric field if one of the phases is dielectric. For the sake of better understanding and improvement in computer models, one needs to understand what should be accounted for and what can be disregarded. It is well-documented that the electric field created with metal electrodes can cause a dielectric liquid to charge and electrohydrodynamic (EHD) flows to appear but little is known whether the charging and the flows take place when there is a second liquid phase that is more conducting and thus is playing a role of an electrode. To address this issue, charge injection from water electrodes into silicone oil is studied-the dynamical current-voltage characteristics are measured in the water meniscus vs copper plane electrode system. The water electrodes are made of agar jelly with the addition of sodium chloride or sodium dodecyl sulfate (anionic surfactant). It has been found that there is a low-voltage section of DCVCs where the current does not exceed 1 nA and a high-voltage section with currents reaching 100 nA. However, the stepping and variability of the oscillograms in the latter section indicates a more complex injection mechanism rather than that observed for metal electrodes. The data allows rough estimates to be made for real two-phase systems, but further research and data collection are necessary.