Electrochemistry in hydrophobic Nafion gels

Andrieux, C.P.; Audebert, Pierre; Divisia-Blohorn, B.; Aldebert, P.; Michalak, F.

doi:10.1016/0022-0728(90)87237-e

Cited by 34 publications

(15 citation statements)

References 12 publications

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“…The increasing popularity of Nafion for the fabrication of redox polymer modified electrodes in recent years arises from easy fabrication, good electrical conductivity, and high partition coefficients of many redox compounds in Nafion. In addition, the Nafion film has high chemical stability, good biocompatibility, and also ability to resist interferences from anions and biological macromolecules (Furbee et al 1993;Andrieux et al 1990;Liu and Deng 1995). The chemical structure of Nafion is schematized in Fig.…”

Section: Introductionmentioning

confidence: 99%

Nafion‐Methylene Blue Functional Membrane and Its Application in Chemical and Biosensing

et al. 2007

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A functional membrane composed of nanoparticles of methylene blue and Nafion perfluorosulfonated ion-exchange resin (Nafion w ) was constructed and characterized by the methods of scanning electron microscope, transmission electron microscope, UV-vis, and Fourier transform infrared. The membrane at glassy carbon electrode was directly applicable for determining H 2 O 2 concentration. Furthermore, horseradish peroxidase was immobilized on the membrane, which showed a quasi-reversible electrochemical behavior with a formal potential of 2296 mV. The resulting biosensor exhibited a good stability and higher sensitivity to H 2 O 2 relative to the membrane without horseradish perioxidase. The linear range of this biosensor for H 2 O 2 determination was from 2 Â 10 25 to 7 Â 10 23 M, with detection limit of 7 Â 10 26 M.

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Section: Introductionmentioning

confidence: 99%

Nafion‐Methylene Blue Functional Membrane and Its Application in Chemical and Biosensing

et al. 2007

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“…X-ray diffraction studies on Fc and Me 10 Fc indicate that the inter-ring methyl group contacts of the latter are within van der Waals distances and, hence, the methyl groups would hinder access of the solvent to the metal center and to the C 5 ring. The electrochemistry of the Me 10 Fc +/0 couple has been studied by a number of groups under a variety of conditions. ,− This couple exhibits a reversible one-electron redox process at the electrode with facile electron-transfer kinetics . All of these facts point to the likelihood that the Me 10 Fc +/0 couple will fulfill the requirements proposed by IUPAC for a reference redox system. , In addition, recent studies on the aqueous electrochemistry of the Me 10 Fc +/0 couple showed that, under certain conditions, this couple exhibited reversible responses required to use this as a redox standard in water, as well as nonaqueous solvents .…”

Section: Introductionmentioning

confidence: 99%

The Decamethylferrocenium/Decamethylferrocene Redox Couple: A Superior Redox Standard to the Ferrocenium/Ferrocene Redox Couple for Studying Solvent Effects on the Thermodynamics of Electron Transfer

et al. 1999

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The solvent dependence of the formal redox potentials of the ferrocenium/ferrocene (Fc+/0) and 1,2,3,4,5-pentamethylferrocenium/1,2,3,4,5-pentamethylferrocene (Me5Fc+/0) couples versus the decamethylferrocenium/decamethylferrocene (Me10Fc+/0) couple indicates that the latter is a superior redox standard for studying solvent effects on the thermodynamics of electron transfer. The couples were studied in 29 solvents and the differences in formal redox potentials between the Me n Fc+/0 (n = 5, 10) and Fc+/0 couples are surprisingly solvent dependent. In the case of the Fc+/0 couple versus the Me10Fc+/0 couple, the potential difference ranges from +583 mV in 2,2,2-trifluoroethanol to +293 mV in water. The positive shifts for the Me5Fc+/0 couple versus the Me10Fc+/0 couple were about half of these values. The Me10Fc+/0 redox couple can also be used in easily oxidized solvents, such as N-methylaniline and N,N-dimethylaniline, or in conjunction with a Hg working electrode. Statistical multiparameter analysis of the differences in potential versus empirical solvent parameters indicate that the redox potential of the Fc+/0 couple is more solvent dependent than that of the Me5Fc+/0 couple. The latter, in turn, is notably more solvent dependent than that of the Me10Fc+/0 couple. These results contradict the widely used “ferrocene assumption” that the redox potential of the Fc+/0 couple is not very solvent dependent. The data show that the Me10Fc+/0 couple is better suited than the Fc+/0 couple as a redox standard for studies of the thermodynamics of solvation of other redox couples. The data also enable previous measurements using the Fc+/0 couple to be corrected to values referenced against the Me10Fc+/0 couple.

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“…The use of various working electrodes such as mercury, carbon, and chemically modified electrodes for electroanalytical measurements has increased in recent years by the reason of their applicability for determining electroactive compounds that undergo oxidation or reduction reactions, which is very substantial in clinical and pharmaceutical studies [3]. Nafion, which is a modifier, is an anionic polyelectrolyte of perfluorinated sulfonated [4]. Nafion is used in electrochemistry a lot for changing an electrode with its very significant features like antifouling capacity, chemical inertness, thermal stability mechanical strength, and high permeability [5]- [8].…”

Section: Introductionmentioning

confidence: 99%

The Ultra-sensitive method development using Nafion and multi-walled carbon nanotube coated glassy carbon electrode for atenolol determination

Kazıcı¹

2018

Pamukkale J Eng Sci

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ÖzAtenolol (Scheme 1) is antihypertensive drug that form β-blocker group, which widely used in the treatment of hypertension In this study, the redox properties of the Tensinor drug used in blood pressure treatment were examined on modified glassy carbon electrode and the electrodes prepared by coating carbon nanotubes on this modified electrode. In order to investigate the effects of nafion coated multi-walled glass nanotube (MWCNT / NGCE) electrode response and nafion coated glassy carbon electrode (NGCE) and electrode responses of only glassy carbon electrode (GCE) surfaces on the support electrolyte, pH and scan rate, the cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods were used. Atenolol (ATN) was observed in the Britton-Robinson (BR) buffer solution (pH 7.0) thereabouts 1.11 V (vsAg / AgCl (3.0 mol L-1 KCl). Voltammetric method reacted linear at a concentration range between 3x10-5 μM and 9x10-2 μM under optimum analytical experimental conditions. The results of Tensinor's limit of detection on the Britton-Robinson (BR) (pH=7) buffer were found to be 7.67 x 10-5 mM and 2.5 x 10-4 mM, respectively. Additionally, in the study, interference effects experiments were performed with auxiliary substances used in the preparation of medicines and no negative effect was observed. Atenolol (Şekil 1), hipertansiyon tedavisinde yaygın olarak kullanılan βbloker grubunu oluşturan antihipertansif ilaçtır. Bu çalışmada; Tansiyon tedavisinde kullanılan Tensinör ilacının redoks özellikleri, modifiye camsı karbon elektrot ve bu modifiye elektrot üzerine karbon nano tüp kaplanarak hazırlanmış elektrotlarda incelenmiştir. Nafion kaplı çok duvarlı karbon nanotüp (MWCNT/NGCE) elektrot yanıtı ile Nafion kaplı camsı karbon elektrot (NGCE) ve sadece camsı karbon elektrot (GCE) yüzeylerinin elektrot yanıtlarının destek elektroliti, pH, ve tarama hızı üzerine etkilerini araştırmak için Çevrimsel voltametri (CV) ve Diferansiyel puls voltametri (DPV) yöntemleri kullanılmıştır.Atenolol (ATN) Britton-Robinson (BR) tampon çözeltisinde (pH 7.0) 1.11 V (vsAg/AgCl (3.0 mol L-1 KC1) civarında gözlenmiştir. Voltametrik yöntem, optimum analitik deney koşulları altında, 3x10-5 µM -9x10-2 mM konsantrasyon aralığında lineer tepki göstermiştir. Britton-Robinson (BR) (pH=7) tamponundaki Tensinör belirme sınırı sonuçları, sırasıyla 7.67 x 10-5 mM ve 2.5x10-4 mM olarak bulunmuştur. Ayrıca çalışmada ilaçların hazırlanmasında kullanılan yardımcı maddeler ile girişim etkisi deneyleri gerçekleştirilmiş ve olumsuz bir etkiye rastlanmamıştır.

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Electrochemistry in hydrophobic Nafion gels

Cited by 34 publications

References 12 publications

Nafion‐Methylene Blue Functional Membrane and Its Application in Chemical and Biosensing

Nafion‐Methylene Blue Functional Membrane and Its Application in Chemical and Biosensing

The Decamethylferrocenium/Decamethylferrocene Redox Couple: A Superior Redox Standard to the Ferrocenium/Ferrocene Redox Couple for Studying Solvent Effects on the Thermodynamics of Electron Transfer

The Ultra-sensitive method development using Nafion and multi-walled carbon nanotube coated glassy carbon electrode for atenolol determination

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