Steady state current for ion transfer reactions at a micro liquid/liquid interface

Campbell, Jane A.; Girault, Hubert H.

doi:10.1016/0022-0728(89)85091-0

Cited by 117 publications

(63 citation statements)

References 2 publications

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“…All in all, in such a system the potential window is equal to about 1 Volt as shown in Fig. 2, where a micro-ITIES supported within a micro-hole in a thin polymer film 6 has been used in order to observe the large currents limiting the potential window. It should be stressed here that the potential scale is the absolute Galvani potential difference, and that the zero of this scale corresponds to an uncharged interface equivalent to a flat band potential in semiconductor electrochemistry.…”

Section: Polarised Itiesmentioning

confidence: 99%

Molecular electrocatalysis at soft interfaces

Méndez

Partovi‐Nia

Hatay

et al. 2010

Phys. Chem. Chem. Phys.

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Section: Polarised Itiesmentioning

confidence: 99%

Molecular electrocatalysis at soft interfaces

Méndez

Partovi‐Nia

Hatay

et al. 2010

Phys. Chem. Chem. Phys.

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“…The development of nanoscale interfaces has received much attention recently, in an attempt to further improve the electrochemical response at the ITIES [13][14][15]. Methods for development of the micro/nano ITIES vary from pulled glass pipettes [11], laser ablation of a substrate [16] to various chemical etching methods [17]. The results reported here utilised a µITIES array fabricated from a silicon membrane containing an array of micropores [18].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behaviour of myoglobin at an array of microscopic liquid–liquid interfaces

O'Sullivan

Arrigan

2012

Electrochimica Acta

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Electrochemistry at liquid-liquid interfaces, or at interfaces between two immiscible electrolyte solutions (ITIES), provides a basis for the non-redox detection of biological molecules, based on iontransfer or adsorption processes. The electroactivity of myoglobin at an array of micron-sized liquidorganogel interfaces was investigated. The µITIES array was patterned with a silicon membrane consisting of an array of eight pores with radii of ~12.8 µm and a pore to pore separation of ~400 µm.Using cyclic voltammetry at the ITIES, the protein was shown to adsorb at the interface and facilitate the transfer of the organic phase electrolyte anions to the aqueous side of the interface. The electrochemical current response was linear with concentration in the range of 1 -6 µM, with corresponding surface coverage of 10 -50 pmol cm -2 . The reverse peak currents was found to be proportional to the voltammetric scan rate, indicating a desorption process. The detection of the protein was only possibly when the pH of the aqueous phase solution was below the pI of the protein. The steady-state simple ion transfer behaviour of tetraethylammonium cation was decreased on the forward sweep, providing a qualitative indication of the presence of adsorbed protein at the interface.Increasing the ionic strength of the aqueous phase resulted in enhanced peak currents, possibly due to aggregation of protein precipitates in the aqueous solution. UV/Vis absorbance spectroscopy was used 1 ISE Member.2 | P a g e to investigate the effects of various aqueous electrolyte solutions on the structure of the protein, and it was shown that at low pH the protein is at least partially denatured. These results provide the basis for label-free detection of myoglobin at the ITIES.

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“…They are often correlated with biological and pharmacological activity, such as adsorption, cell membrane permeability and hydrophobic binding. 4,5 Although large and significant progress has been achieved in the last decade, [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] standard Gibbs energies of transfer of many common inorganic ions are still not available. 6 One reason for this situation are the limitations of the four-electrode technique.…”

Section: Introductionmentioning

confidence: 99%

Standard Gibbs energies of transfer of halogenate and pseudohalogenate ions, halogen substituted acetates, and cycloalkyl carboxylate anions at the water|nitrobenzene interface

Gulaboski

Riedl

Scholz

2003

Phys. Chem. Chem. Phys.

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The previously introduced three-phase electrode technique was used to determine the Gibbs energies of transfer of ClO 3 Cl,Br,I), and cycloalkyl carboxylate anions ((CH 2 ) n COO À , n ¼ 3,. . .,7) at the water|nitrobenzene interface. Whereas the data for the small inorganic ions can easily be understood in terms of ion-dipole interactions, the data of the organic ions need consideration of charge delocalisation and its effect on the enthalpy and entropy of solvation.

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Steady state current for ion transfer reactions at a micro liquid/liquid interface

Cited by 117 publications

References 2 publications

Molecular electrocatalysis at soft interfaces

Molecular electrocatalysis at soft interfaces

Electrochemical behaviour of myoglobin at an array of microscopic liquid–liquid interfaces

Standard Gibbs energies of transfer of halogenate and pseudohalogenate ions, halogen substituted acetates, and cycloalkyl carboxylate anions at the water|nitrobenzene interface

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