Detection and Study of Single Water/Oil Nanoemulsion Droplet by Electrochemical Collisions on an Ultramicroelectrode

Nhung T.T. Hoang, Thy L.T. Ho, Jun Hui Park, Byung Kwon Kim

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


Herein, for the first time, research on water-in-oil (water/oil) emulsion droplets by electrochemical analysis has been reported. When the water/1,2-dichloroethane emulsion droplets collided with an ultramicroelectrode (UME), the blocking property of the droplets resulted in a “staircase” current decrease. Each “staircase” current decrease is associated with the collision of an emulsion droplet with the UME surface. The experimental collision frequency was proportional to the concentration of the emulsion droplet. In addition, the size of each water droplet was estimated from the magnitude of the “staircase” current decrease and the simulation data. Results obtained from the collision signals provide information about the size of each single droplet (nano- to micro-) and the pM level concentrations of the water droplets in the organic continuous phase.

Original languageEnglish
Pages (from-to)128-132
Number of pages5
JournalElectrochimica Acta
StatePublished - 10 Aug 2017

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2016R1D1A1B03931670, NRF-2015R1C1A1A01055250).

Publisher Copyright:
© 2017 Elsevier Ltd


  • Droplet sensing
  • Emulsion blocking
  • Single emulsion detection
  • Single particle nano-impact
  • Water in oil emulsion


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