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Detection of Water-in-Oil Droplet Formation within an Interfacial Region Formed by an Aqueous/1, 2-Dichloroethane Interface Using Transient Cell Impedance Measurements at a Single High Frequency

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Abstract

The detection of water-in-oil (w/o) droplet formation within an interfacial region formed by an interface between an aqueous phase and 1,2-DCE using transient impedance measurements in an unconventional electrochemical cell is herein reported. Droplet formation causes a large peak-like increase in transient real cell impedance. Peaks are likely caused by significant decrease in ion concentration within the interfacial region by formation of w/o droplets containing electrolyte. Droplet formation and an accompanying interfacial stability was observed when antagonistic salts (consisting of a hydrophobic ion of \({\rm{\Delta }}G_{{\rm{tr}}}^{^ \circ ,{\rm{water}} \to 1,2 - {\rm{DCE}}} \le \) TBA+) were mixed with conventional aqueous electrolytes in the aqueous phase. The instability manifests as Marangoni convection, causing rapid mass transport in the adjacent fluid on both sides of the liquid/liquid interface.

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Authors and Affiliations

  1. Biophysical Chemistry Department, J. Heyrovský Institute of Physical Chemistry of the CAS, v. v. i. c, Prague 8, Prague, 18223, Czech Republic

    B. R. Silver

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  1. B. R. Silver
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Correspondence to B. R. Silver.

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Published in Russian in Elektrokhimiya, 2019, Vol. 55, No. 3, pp. 373–378.

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Silver, B.R. Detection of Water-in-Oil Droplet Formation within an Interfacial Region Formed by an Aqueous/1, 2-Dichloroethane Interface Using Transient Cell Impedance Measurements at a Single High Frequency. Russ J Electrochem 55, 236–241 (2019). https://doi.org/10.1134/S1023193519020095

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  • DOI: https://doi.org/10.1134/S1023193519020095

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