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Electrokinetic transport of a charged dye in a freely suspended liquid film: Experiments and numerical simulations

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journal contribution
posted on 22.01.2020 by Abdulkadir Hussein-Sheik, Faraz Montazersadgh, Victor Starov, Anna Trybala, Upul Wijayantha-Kahagala-Gamage, Hemaka Bandulasena
Electrokinetic transport of a charged dye within a free liquid film stabilised by a cationic surfactant, trimethyl(tetradecyl)ammonium bromide (TTAB), subjected to an external electric field was investigated. Confocal laser scanning microscopy was used to visualise fluorescein isocyanate (FICT) separation within the stabilised liquid film. Numerical simulations were performed using Finite Element Method to model the dynamics of charged dye separation fronts observed in the experiments. Due to the electrochemical reactions at the electrodes, significant spatial and temporal pH changes were observed within the liquid film. These local pH changes could affect the local zeta potential at the gas-liquid and solid-liquid film boundaries; hence the flow field was found to be highly dynamic and complex. The charged dye (FICT) used in the experiments is pH sensitive, therefore electrophoresis of the dye also depended on the local pH. The pH and the electroosmotic flow field predicted from the numerical simulations were useful for understanding charged dye separation near both the anode and the cathode.

Funding

MAP EVAPORATION project from European Space Agency

Procter & Gamble

Brussels and Department of Chemical Engineering at Loughborough University

EPSRC for the support through the Joint University Industry Consortium for Energy materials and Devices (JUICED) Hub (EP/R023662/1)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering
  • Mechanical, Electrical and Manufacturing Engineering

Department

  • Chemical Engineering

Published in

Langmuir

Volume

36

Issue

5

Pages

1183 - 1191

Publisher

American Chemical Society (ACS)

Version

VoR (Version of Record)

Rights holder

© American Chemical Society

Publisher statement

This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.

Publication date

2020-01-19

Copyright date

2020

ISSN

0743-7463

eISSN

1520-5827

Language

en

Depositor

Dr Hemaka Bandulasena. Deposit date: 20 January 2020

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