Experimental Investigation of Eletrokinetic Stabilization of Gravitational Drainage of Ionic Surfactants Films

Soumyadip Sett, Rakesh P. Sahu, Suman Sinha-Ray, Alexander Yarin

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Gravitational drainage of vertical films of ionic surfactants supported on a frame with the upper and lower parts being electrodes is studied experimentally. The electric field introduces three additional physical phenomena: (i) the surface charge redistribution, which eventually changes surface elasticity, (ii) the electroosmotic flow in the diffuse layer, and (iii) pressure build-up near the electrode toward which the electroosmotic flow is directed. It is shown that stabilization of the films is possible either due to the traction imposed by the electroosmotic flow directed upward (against gravity), or due to the pressure build-up near the lower end of the frame, in cases where the electroosmotic flow is directed downward (in the gravity direction) and enters a dead end at the lower electrode.

Original languageEnglish
Pages (from-to)693-703
Number of pages11
JournalElectrochimica Acta
Volume187
DOIs
Publication statusPublished - 2016 Jan 1

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Keywords

  • Electrokinetic stabilization
  • Electroosmosis
  • Foams
  • Gravitational drainage
  • Surfactant films

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

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