Electrical Conductivity of Field-Structured Emulsions

Abstract

The structure formation influence on various macroscopic properties of fluid–fluid disperse systems is poorly investigated. The present work deals with the experimental study of the charge transfer in emulsions whose dispersed phase droplets are arranged into chainlike structures under the action of an external force field. The emulsions studied are the fluid system in which water droplets are dispersed in a hydrocarbon-based magnetic fluid. Under the effect of an external uniform magnetic field, anisotropic aggregates form from the emulsion dispersed phase drops. The low-frequency electrical conductivity of emulsions has been measured. It is demonstrated that the emulsions’ conductivity grows several times under the effect of magnetic field parallel to the measuring electrical field. The anisotropic character of the emulsion electrical conductivity in the presence of magnetic field has been demonstrated. It is revealed that the maximal response of conductivity on the magnetic field action takes place at the dispersed phase volume fraction of about 20%. The dynamics of the conductivity variation is analyzed in dependence on the magnetic field strength and the dispersed phase volume fraction. The obtained results may be of interest in the development of potential applications of disperse systems with magnetic-field-controllable properties.

Formulation and Physicochemical Properties of Kaffir Lime Oil-in-Water Beverage Emulsions and Antibacterial Test

“…Then, these values changed after adding gum arabic and HFCS components *Conductivity value μS/cm Conductivity value change upon adding gum arabic was higher and went lower when fructose was added. When water meets gum arabic, they create charged molecules that transfer electrons from one atom to another atom [9], increasing conductivity by 317.3 μS/cm on average. This may ensue to the presence of a surfactant whose Kaffir Lime Oil-In-Water Baverage Emulsion (Johar, et al) specific conductivity is many orders of magnitude below that of the dispersed phase and also the dispersion medium.…”

“…Electrical conductivity is a parameter used to starting point to study the kind of emulsion, determinant section inversion temperature also as identification of potential instability phenomena like flocculation and coalescence [9].…”

“…Furthermore, pre-analysis to physicochemical stability properties was determined by the turbidity, pH, conductivity value, where a more stable turbidity value measured in different time intervals means a better stability physicochemical parameters [9].…”

Self‐Propulsion by Directed Explosive Emulsification

“…This event, accompanied with a sharp increase in the IFT, is two orders of magnitude more intense than that achievable by other means, indicating that the underlying mechanism is electrostatic in origin. [ 24 ] The explosive emulsification described here is distinct from prior research that used magnetic or electric fields to demulsify the emulsions [ 25 ] or tune their macroscopic properties by adjusting the emulsions interaction and microscale physical phenomena, [ 26–28 ] and also different from conventional rapid emulsification processes, for example, spontaneous emulsification [ 29 ] and electric emulsification. [ 23 ] For spontaneous emulsification, various mechanisms have been reported, for example, ultralow/negative interfacial tension [ 29–31 ] and supersaturation of surfactants/cosolvents at the interface.…”