A correlation between the half-wave potential and the micelle-solubilization equilibrium of ferrocene in cationic micellar solutions

Ohsawa, Yasuhiko; Aoyagui, Shigeru

doi:10.1016/0022-0728(82)85056-0

Cited by 86 publications

(35 citation statements)

References 10 publications

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“…In such an organic phase, FcMeOH is stabilized (and its oxidation product, [FcMeOH] þ , not at all), explaining the potential shift to more positive values. This explanation is also supported by previous observations reporting anodic overpotentials for the ferrocene/ferricinium redox couple in cationic micellar solutions of alkyltrimethylammonium bromide [40]. Electrostatic repulsion between [FcMeOH] þ and CTA þ can also contribute to explain the potential shift of the voltammetric signals and the vanishing of the reduction peak.…”

Section: Basic Characterization By Cyclic Voltammetrysupporting

confidence: 72%

Preconcentration Electroanalysis at Surfactant‐Templated Thiol‐Functionalized Silica Thin Films

2007

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Surfactant-templated thiol-functionalized silica thin films have been deposited by spin-coating on glassy carbon electrodes. Their permeability properties have been characterized using three solution phase redox probes (Ru(NH 3 ) 3þ 6 , Fe(CN) 3À 6 , FcMeOH) and their suitability to be applied for preconcentration electroanalysis has been studied using Ag þ as model analyte. Both the film permeability to redox probes and the performance of the modified electrodes towards Ag þ sensing were found to be dramatically influenced by the composition of the sol used for preparing the thin films, and especially its surfactant content. The best results were obtained with materials prepared from rather high surfactant concentration because they led (after template removal) to highly open mesoporous deposits with readily accessible thiol groups in the mesopore channels. The effect of various parameters on the electrode response have been investigated, including the composition of the detection medium, the accumulation time, the level of functionalization of the films and their preparation conditions, and the analyte concentration. A linear response for Ag þ was obtained in the 0.2 -10 mM concentration range.

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Section: Basic Characterization By Cyclic Voltammetrysupporting

confidence: 72%

Preconcentration Electroanalysis at Surfactant‐Templated Thiol‐Functionalized Silica Thin Films

2007

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“…† To whom correspondence should be addressed. E-mail: aksrivastava@chem.mu.ac.in; akschbu@yahoo.com coefficients of electrode processes, thus changing the stability of electrogenerated intermediates and electrochemical products, [16][17][18][19][20][21][22] which becomes an advantage for its use in electrochemistry and modification of electrode. 23 We have reported voltammetric behavior of certain vitamins 24 (viz.…”

Section: Introductionmentioning

confidence: 99%

Polarographic Behavior of Nicotinamide in Surfactant Media and Its Determination in Cetyltrimethylammonium Bromide Surfactant System

Kotkar

Srivastava

2008

ANAL. SCI.

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“…The value found for the slope of the straight-line was 0.095, which is higher than the value that indicates reversibility for processes involving one electron (0.059). 48 Further, from diagnosis tests of the cyclic voltammetry theory, 49,50 it was confirmed that the process approached quasi-reversibility conditions (Table 2 and Figure 1, right side).…”

Section: Electrochemical Studiesmentioning

confidence: 81%

Physical chemical properties and kinetics of redox processes in water/soybean oil microemulsions

Mendonça¹,

Bica²,

Simó‐Alfonso³

et al. 2008

J. Braz. Chem. Soc.

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Microemulsões de água em óleo (ME w/o) constituídas de água, óleo de soja, SDS (dodecil sulfato de sódio) e diversos álcoois de cadeia curta foram caracterizadas sob o ponto de vista físico-químico e de propriedades eletroanalíticas. Foram testados diferentes co-surfactantes e razões surfactante:cosurfactante, sendo a ME com a composição mais favorável utilizada para estudar a cinética de processos redox. Para tanto, realizaram-se medidas de voltametria cíclica utilizando como eletrodo de trabalho um ultramicroeletrodo de disco de Pt e, como eletrodo de referência e auxiliar, foram usados Ag/AgCl e Pt, respectivamente, e ferroceno como uma sonda. Verificou-se que a estabilidade termodinâmica das MEs aumenta com o conteúdo de co-surfactante. A estrutura molecular e a solubilidade em água do co-surfactante afetam a condutividade elétrica e o raio hidrodinâmico das MEs. Devido aos baixos coeficientes de difusão observados na ME, foi possível a realização de medidas em estado transiente usando velocidades de varredura convencionais. A oxidação do ferroceno na ME demonstrou ocorrer em condições de quasi-reversibilidade. Assim, foi demonstrada a possibilidade de realizar estudos por voltametria cíclica em óleos vegetais sob a forma de ME w/o.Water/oil microemulsions (w/o ME) constituted by water, soybean oil, SDS (sodium dodecyl sulfate) and several short-chain alcohols were characterized from the viewpoint of its physical-chemical and electroanalytical properties. Different co-surfactants and surfactant:co-surfactant ratios were used, and the ME with the most favourable composition was used to study the kinetics of redox processes. For this purpose, cyclic voltammetry measurements using a Pt disk working ultramicroelectrode, an Ag/AgCl reference electrode and a Pt auxiliary electrode, and ferrocene as a probe, were performed. It was verified that the thermodynamic stability of the MEs increases with the co-surfactant content. The molecular structure and water solubility of the co-surfactant affect the electrical conductivity and the hydrodynamic radio of the MEs. Owing to the low diffusion coefficients verified in the MEs, measurements in transient state using conventional sweeping rates could be performed. Ferrocene oxidation in the ME has been demonstrated to proceed in quasi-reversibility conditions. Thus, the possibility of carrying out studies of cyclic voltammetry in vegetable oils under the w/o ME form was demonstrated.Keywords: w/o microemulsions, physical chemical properties, redox process, cyclic voltammetry, vegetable oils IntroductionValuable information relative to structure evolution, inter-particle interactions and transport data of mass and charge in diverse media, can be obtained by using electrochemical techniques. 1-3 However, the application of these techniques in nanoheterogeneous systems, including microemulsions (MEs), has been scarcely exploited. MEs are optically transparent, isotropic and thermodynamically stable systems. Water in oil (w/o) MEs are formed by water droplets dispersed in an oi...

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A correlation between the half-wave potential and the micelle-solubilization equilibrium of ferrocene in cationic micellar solutions

Cited by 86 publications

References 10 publications

Preconcentration Electroanalysis at Surfactant‐Templated Thiol‐Functionalized Silica Thin Films

Preconcentration Electroanalysis at Surfactant‐Templated Thiol‐Functionalized Silica Thin Films

Polarographic Behavior of Nicotinamide in Surfactant Media and Its Determination in Cetyltrimethylammonium Bromide Surfactant System

Physical chemical properties and kinetics of redox processes in water/soybean oil microemulsions

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