Characterisation of hydrophobic carbon nanofiber–silica composite film electrodes for redox liquid immobilisation

Niedziolka, Joanna; Murphy, Maria A.; Marken, Frank; Opałło, Marcin

doi:10.1016/j.electacta.2006.03.028

Cited by 30 publications

(25 citation statements)

References 37 publications

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“…For this purpose graphite-mesoporous hydrophobic silicate bulk material [10,11] and carbon nanofibers embedded into mesoporous hydrophobic silicate [12 -14] were successfully employed. For the latter material the efficiency of the electrode process with a pure redox liquid was enhanced to over 30% [14]. Similar efficiencies were also obtained with redox liquid deposits on mesoporous hydrophobic silicate film covered with thin film of gold [15].…”

Section: Introductionsupporting

confidence: 55%

A Porous ITO Nanoparticles Modified Electrode for the Redox Liquid Immobilization

et al. 2007

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Tin-doped indium oxide (ITO) nanoparticles (ca. 20 nm in diameter) were deposited onto electrode surfaces employing a simple immersion, withdrawal and solvent evaporation method. The resulting ITO films are irregularly packed and highly porous and they promote electron transport. When water insoluble redox liquids are immobilized within the porous film efficient electrochemical reactions occur at the solid-liquid and at liquid-liquid interfaces. Scanning electron microscopy reveals a macroscopically uniform surface of the deposit. The thickness of the film estimated by atomic force microscopy is proportional to the number of deposited layers with a thickness increase per single immersion and withdrawal step equal to approximately 60 nm. However, the films are deposited non-uniformly and the thickness only provides an average parameter. The results of voltammetric experiments performed in aqueous electrolyte solution indicate good adhesion and wetting of the deposit. The surface electroactivity towards the electrooxidation of ferrocenedimethanol provides highly reversible responses without any blocking effects. The ITO nanoparticle modified electrode surface was impregnated with nanomole amounts of a hydrophobic redox liquid, tertbutylferrocene, and then immersed in the aqueous electrolyte solutions. The value of the voltammetric peak current and the efficiency of the multi-phase electrode process improved proportional to the number of immersion and withdrawal steps from ITO nanoparticles suspension. This improvement is also observed after further electrode modification with a hydrophobic thin film via sol-gel processing of methyltrimethoxysilane. In this case the porous film at the electrode surface can be surface modified to provide affinity to certain liquids or analytes.

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Section: Introductionsupporting

confidence: 55%

A Porous ITO Nanoparticles Modified Electrode for the Redox Liquid Immobilization

et al. 2007

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“…Porous metal surfaces [15] as well as porous carbon surfaces [16] have been suggested. The application of tin-doped indium oxide (ITO) nanoparticles has been proposed [5] for the formation of thin mesoporous films with both conductivity and optical transparency.…”

Section: Introductionmentioning

confidence: 99%

Spectroelectrochemical Investigation of TPPMn(III/II)‐Driven Liquid | Liquid | Electrode Triple Phase Boundary Anion Transfer into 4‐(3‐Phenylpropyl)‐Pyridine: ClO₄⁻, CO₃H⁻, Cl⁻, and F⁻

2012

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The triple phase boundary transfer of anions from the aqueous into an organic phase can be driven electrochemically here with the tetraphenylporphyrinato-Mn(III/II) (or TPPMn) redox system in 4-(3-phenylpropyl)-pyridine) (or PPP). Anions investigated are perchlorate, chloride, fluoride, and bicarbonate. The bicarbonate and fluoride transfer processes are shown to be chemically more complex compared to the perchlorate and chloride cases with UVvis-spectroelectrochemical measurements indicating a combination of HCO 3 À /CO 3 2À transfer processes and association of fluoride with TPPMn(III) + , respectively. In situ spectroelectrochemistry is developed for ion-transfer voltammetry into sub-microliter organic phase regions on mesoporous ITO conducting film electrodes.

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“…Inverse experiments for the evaluation of lipophilic parameters in water droplets immobilized on organic electrodes subsequently submersed into organic electrolyte solutions have also been used [43]. Other recent and important contributions in the field of ionic drug transfer studies, obtained by using the three-phase electrode, were reported by Opalo and Marken et al [44][45][46][47][48], Karyakin et al [49][50][51], Pereira et al [52], and Mirceski et al [53,54]. Detailed information on the application and fundaments of the threephase electrode process can be find in reviews by Scholz et al [7,8] and Marken [6] reviews.…”

Section: Partition Coefficients Of Ionic Drugs De-termined By the "Thmentioning

confidence: 99%

“…Shao and Pereira et al [78] reported, for first time, the polarization of a nano-interface between water and n-octanol by using a modified version of the classical four electrode voltammetry at ITIES. Additionaly, nitrophenyloctyl ether (NPOE) emerged as a viable non-toxic organic solvent in experiments at the polarized liquid-liquid interface [5,9,37,44,46,[79][80][81][82]. NPOE has a moderate dielectric constant and a high viscosity that makes it a good ionic solvent suitable for kinetic studies.…”

Section: Organic Solvents Used In Biomimetic Membranesmentioning

confidence: 99%

Voltammetric Insights in the Transfer of Ionizable Drugs Across Biomimetic Membranes - Recent Achievements

Gulaboski¹,

Borges²,

Pereira³

et al. 2007

CCHTS

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Abstract:The latest results of voltammetric research on the ionic transfer process of ionisable drugs across bare and lipid-modified liquid-liquid interfaces are reviewed. In recent years, two voltammetric methods have been extensively applied to this purpose, i.e. the classical four electrode voltammetry at the interface between two immiscible electrolyte solutions, and the "three-phase electrode." Thus, a brief background of the methodologies and some successful examples of their application are highlighted in this work. Particular attention is given to the ionic transfer kinetics and to the electrochemical characterization of the drug-membrane interactions between the ionized drugs and lipid-modified interfaces. Future trends in this area are also mentioned in connection with high-throughput assessment of ADMET properties of drugs.

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Characterisation of hydrophobic carbon nanofiber–silica composite film electrodes for redox liquid immobilisation

Cited by 30 publications

References 37 publications

A Porous ITO Nanoparticles Modified Electrode for the Redox Liquid Immobilization

A Porous ITO Nanoparticles Modified Electrode for the Redox Liquid Immobilization

Spectroelectrochemical Investigation of TPPMn(III/II)‐Driven Liquid | Liquid | Electrode Triple Phase Boundary Anion Transfer into 4‐(3‐Phenylpropyl)‐Pyridine: ClO₄⁻, CO₃H⁻, Cl⁻, and F⁻

Voltammetric Insights in the Transfer of Ionizable Drugs Across Biomimetic Membranes - Recent Achievements

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Characterisation of hydrophobic carbon nanofiber–silica composite film electrodes for redox liquid immobilisation

Cited by 30 publications

References 37 publications

A Porous ITO Nanoparticles Modified Electrode for the Redox Liquid Immobilization

A Porous ITO Nanoparticles Modified Electrode for the Redox Liquid Immobilization

Spectroelectrochemical Investigation of TPPMn(III/II)‐Driven Liquid | Liquid | Electrode Triple Phase Boundary Anion Transfer into 4‐(3‐Phenylpropyl)‐Pyridine: ClO4−, CO3H−, Cl−, and F−

Voltammetric Insights in the Transfer of Ionizable Drugs Across Biomimetic Membranes - Recent Achievements

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Product

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About

Spectroelectrochemical Investigation of TPPMn(III/II)‐Driven Liquid | Liquid | Electrode Triple Phase Boundary Anion Transfer into 4‐(3‐Phenylpropyl)‐Pyridine: ClO₄⁻, CO₃H⁻, Cl⁻, and F⁻