acs.langmuir.9b03852.pdf (3.88 MB)
Electrokinetic transport of a charged dye in a freely suspended liquid film: Experiments and numerical simulations
journal contribution
posted on 2020-01-22, 13:59 authored by Abdulkadir Hussein-Sheik, Faraz Montazersadgh, Victor Starov, Anna TrybalaAnna Trybala, Upul Wijayantha-Kahagala-Gamage, Hemaka BandulasenaHemaka BandulasenaElectrokinetic 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
LangmuirVolume
36Issue
5Pages
1183 - 1191Publisher
American Chemical Society (ACS)Version
- VoR (Version of Record)
Rights holder
© American Chemical SocietyPublisher 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
2020-01-19Copyright date
2020ISSN
0743-7463eISSN
1520-5827Publisher version
Language
- en
Depositor
Dr Hemaka Bandulasena. Deposit date: 20 January 2020Usage metrics
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