Voltammetry for surface-active ions at polarisable liquid|liquid interfaces

Méndez, Manuel A.; Su, Bin

doi:10.1016/j.jelechem.2009.07.013

Cited by 16 publications

(11 citation statements)

References 40 publications

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“…Figure 7 shows that the heights of the forward peaks are directly proportional to scan rates-this situation is associated with adsorption of DPPC at the interface and thus charging of the electrical double layer. 25 When voltammograms are examined, e.g., in Figure 8, the values of forward and backward peak currents are not exactly equal. This difference, of course, varies depending on phospholipid concentrations at the interface.…”

Section: Resultsmentioning

confidence: 98%

“…10,16,24 The voltammetric responses associated with the combined ion adsorption/ion transfer processes have also been theoretically addressed in the literature. 25 More recently, assisted proton transfer by phospholipids across a liquid/liquid interface has been utilized for solar fuel generation. 26 In this paper we report our experimental results from a large liquid/liquid interface (W/DCE) by ion transfer voltammetry to confirm the previously proposed mechanisms of facilitated proton transfer to extend them, controlling both the pH of the aqueous phase and the phospholipid concentration in the organic phase.…”

Section: Introductionmentioning

confidence: 99%

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Transfer of the protonable surfactant dipalmitoyl-phosphatidylcholine across a large liquid/liquid interface: a voltammetric study

Uyanik¹

2018

Turk J Chem

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Adsorption behavior of the zwitterionic phospholipid dipalmitoyl-phosphatidylcholine (DPPC) at the polarizable liquid/liquid interface formed between water and 1,2-dichloroethane electrolyte solutions is studied taking into account both the pH of the aqueous phase and the concentration of the phospholipid in the organic phase by cyclic voltammetry. Experimental results showed that the adsorption of the phospholipid strongly depends on the pH of the aqueous phase, which determines the surface ionization of the polar head of the phospholipid molecule and hence the stability of the adsorbed layer of phospholipids.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Transfer of the protonable surfactant dipalmitoyl-phosphatidylcholine across a large liquid/liquid interface: a voltammetric study

Uyanik¹

2018

Turk J Chem

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“…Along with the development of a wide variety of experimental techniques for the characterization of interfacial reactions, as those aforementioned, great efforts have also been directed towards their theoretical description. Some of the most representa tive examples are facilitated iontransfer, [9] potentialdependent adsorption [10] and het erogeneous photoinduced electrontrans fer. [11]…”

Section: Spectro-electrochemistry At Itiesmentioning

confidence: 99%

LEPA: From Proteomics to Energy Conversion

Cortés‐Salazar¹,

Gassner²,

Méndez³

et al. 2011

Chimia

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This review article summarizes the different fields of research at the Laboratoire d'Electrochimie Physique et Analytique at the Ecole Polytechnique Fédérale de Lausanne. The research areas covered include charge transfer reactions at soft interfaces, bio-analytical microchips and electrophoretic methods, electrochemical ionization methods for mass spectrometry and Scanning Electrochemical Microscopy (SECM).

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“…This built on earlier work by Sawada and Osakai, 27 who measured the transfer of hydrophobic peptides facilitated by DB18C6 and found good agreement between the half-wave potential and the peptide equivalent hydrophobicity index. Recently, Méndez et al 28 simulated the adsorption of 70 surface-active ions to liquid-liquid interfaces. They considered surfactant partitioning across the interface, whereby the adsorbed molecules could have portions in both the organic and aqueous phases.…”

Section: Introductionmentioning

confidence: 99%

“…Two common approaches include transfer of small biomolecules across the liquid-liquid interface facilitated by an ionophore, 26,27 and ion transfer across the interface facilitated by biomolecules present in the aqueous phase and adsorbed at the interface. 11,28 Scanlon et al 26 investigated the electroanalytical capabilities of micro-ITIES with differential-pulse stripping voltammetry to detect the transfer of small oligopeptides assisted by the dibenzo-18-crown-6 (DB18C6) ether. This built on earlier work by Sawada and Osakai, 27 who measured the transfer of hydrophobic peptides facilitated by DB18C6 and found good agreement between the half-wave potential and the peptide equivalent hydrophobicity index.…”

Section: Introductionmentioning

confidence: 99%

Finite-element simulations of the influence of pore wall adsorption on cyclic voltammetry of ion transfer across a liquid–liquid interface formed at a micropore

Ellis

Strutwolf

Arrigan

2012

Phys. Chem. Chem. Phys.

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Adsorption onto the walls of micropores was explored by computational simulations involving cyclic voltammetry of ion transfer across an interface between aqueous and organic phases located at the micropore. Micro-interfaces between two immiscible electrolyte solutions (micro-ITIES) have been of particular research interest in recent years and show promise for biosensor and biomedical applications. The simulation model combines diffusion to and within the micropore, Butler-Volmer kinetics for ion transfer at the liquid-liquid interface, and Langmuir-style adsorption on the pore wall. Effects due to pore radius, adsorption and desorption rates, surface adsorption site density, and scan rates were examined. It was found that the magnitude of the reverse peak current decreased due to adsorption of the transferring ion on the pore wall; this decrease was more marked as the scan rate was increased. There was also a shift in the half-wave potential to lower values following adsorption, consistent with a wall adsorption process which provides a further driving force to transfer ions across the ITIES. Of particular interest was the disappearance of the reverse peak from the cyclic voltammogram at higher scan rates, compared to the increase in the reverse peak size in the absence of wall adsorption. This occurred for scan rates of 50 mV s(-1) and above and may be useful in biosensor applications using micropore-based ITIES.

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Voltammetry for surface-active ions at polarisable liquid|liquid interfaces

Cited by 16 publications

References 40 publications

Transfer of the protonable surfactant dipalmitoyl-phosphatidylcholine across a large liquid/liquid interface: a voltammetric study

Transfer of the protonable surfactant dipalmitoyl-phosphatidylcholine across a large liquid/liquid interface: a voltammetric study

LEPA: From Proteomics to Energy Conversion

Finite-element simulations of the influence of pore wall adsorption on cyclic voltammetry of ion transfer across a liquid–liquid interface formed at a micropore

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