Procedures used in electrokinetic investigations of surfactant-laden interfaces, liquid films and foam system

Sheik, Abdulkadir Hussein; Montazersadgh, Faraz; Starov, Victor; Trybała, Anna; Bandulasena, Hemaka C.H.

doi:10.1016/j.cocis.2018.09.001

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…However, pH can have a significant effect on the transport processes because of large surface-to-volume ratios in films and foams: pH sensitivity of both liquid–air and liquid–solid interfaces and zeta potential of suspended dye particles. Therefore, transport of a charged dye in a freely suspended liquid film, which is pH-sensitive, is investigated below using the experimental setup reported earlier in refs , , . Numerical simulations are performed to understand the observed dye separation front.…”

Section: Introductionmentioning

confidence: 99%

Electrokinetic Transport of a Charged Dye in a Freely Suspended Liquid Film: Experiments and Numerical Simulations

et al. 2020

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Electrokinetic transport of a charged dye within a free liquid film stabilized by a cationic surfactant, trimethyl-(tetradecyl)ammonium bromide, subjected to an external electric field was investigated. Confocal laser scanning microscopy was used to visualize fluorescein isothiocyanate (FITC) separation within the stabilized liquid film. Numerical simulations were performed using the finite element method to model the dynamics of charged dye separation fronts observed in the experiments. Because of 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 (FITC) used in the experiments is pH-sensitive, and 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.

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Section: Introductionmentioning

confidence: 99%

Electrokinetic Transport of a Charged Dye in a Freely Suspended Liquid Film: Experiments and Numerical Simulations

et al. 2020

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“…The variation may potentially be caused by the foams structure, and how electroosmotic flows develop within, as well as the decay of the foam. Due to the difference in scale, electroosmotic flow is expected to dominate within the thin film lamellae between bubbles, while pressure driven backflow is expected to dominate within the thicker plateau borders away from the outlets [28][29][30][31]. Rhodamine B is neither attracted nor repelled by the charged interface, and is expected to be present throughout the foam, and so the electroosmotic flow and backflow will act to mix the rhodamine B throughout the device, potentially leading to uneven concentrations upon eventual foam collapse.…”

Section: Resultsmentioning

confidence: 99%

Continuous Electrophoretic Separation of Charged Dyes in Liquid Foam

Fauvel

Trybała

Tseluiko

et al. 2023

Colloids and Interfaces

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A novel electrophoretic separation technique is presented, where continuous electrophoretic separation is demonstrated using free flowing liquid foams. Continuous foam electrophoresis combines the principle of capillary electrophoresis and interactions between analytes and the electrical double layer, with the ability of Free Flow Electrophoresis to continuously separate and recover analytes automatically. A liquid foam is used to provide a network of deformable micro and nano channels with a high surface area, presenting a novel platform for electrophoresis, where interfacial phenomena could be exploited to modify analyte migration. The main purpose of this paper is to present a proof-of-concept study and provide fundamental understanding of a complex foam system in continuous separation mode, i.e., flowing liquid foam under an external electric field with electrophoresis and chemical reactions at the electrodes continuously changing the system. Liquid foam is generated using a mixture of anionic and non-ionic surfactants and pumped through a microfluidic separation chamber between two electrodes. The effectiveness of the device is demonstrated using a dye mixture containing a neutral dye and an anionic dye. At the outlet, the foam is separated and collected into five fractions which are individually probed for the concentration of the two dyes used. The anionic dye was concentrated up to 1.75 (±0.05) times the initial concentration in a select outlet, while the neutral dye concentration remained unchanged in all outlets, demonstrating the potential for electrophoretic foam separations.

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Combined surface analysis methods

Liggieri

Miller

2018

Current Opinion in Colloid & Interface Science

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Procedures used in electrokinetic investigations of surfactant-laden interfaces, liquid films and foam system

Abstract: Procedures used in Electrokinetic investigations of surfactant-laden interfaces, liquid films and foam system. Cocis (2018),

Cited by 5 publications

References 26 publications

Electrokinetic Transport of a Charged Dye in a Freely Suspended Liquid Film: Experiments and Numerical Simulations

Electrokinetic Transport of a Charged Dye in a Freely Suspended Liquid Film: Experiments and Numerical Simulations

Continuous Electrophoretic Separation of Charged Dyes in Liquid Foam

Combined surface analysis methods

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