Effect of Triton X-100 on electron transfer kinetics at the interface between two immiscible electrolyte solutions: A scanning electrochemical microscopy study

Jie Zhang, P. R. Unwin

Research output: Contribution to journalArticleResearchpeer-review

17 Citations (Scopus)

Abstract

Adsorption of the nonionic surfactant, Triton X-100, at the interface between two immiscible electrolyte solutions (ITIES) and its effect on the oxidation of decamethyl ferrocene in 1,2-dichloroethane by aqueous Ru(CN)63- has been investigated using scanning electrochemical microscopy. As the concentration of Triton X-100 in the aqueous phase was increased from 0 to 2.5 × 10-4 M, the rate constant for electron transfer (ET) across the ITIES decreased in a manner consistent with the surfactant blocking the area available for the reaction. The decrease in rate constant with increasing surfactant concentration was successfully analyzed in terms of Langmuirian adsorption of the surfactant, with an equilibrium constant of (2.72 ± 0.06) × 104 M-1. The overall behavior observed indicates that the ET reaction occurs primarily at the portion of the ITIES free from surfactant.

Original languageEnglish
Pages (from-to)47-52
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume494
Issue number1
DOIs
Publication statusPublished - 1 Dec 2000
Externally publishedYes

Keywords

  • Electron transfer
  • Liquid|liquid interface
  • SECM
  • Triton X-100

Cite this

@article{75502f3981884975818464ba293bff04,
title = "Effect of Triton X-100 on electron transfer kinetics at the interface between two immiscible electrolyte solutions: A scanning electrochemical microscopy study",
abstract = "Adsorption of the nonionic surfactant, Triton X-100, at the interface between two immiscible electrolyte solutions (ITIES) and its effect on the oxidation of decamethyl ferrocene in 1,2-dichloroethane by aqueous Ru(CN)63- has been investigated using scanning electrochemical microscopy. As the concentration of Triton X-100 in the aqueous phase was increased from 0 to 2.5 × 10-4 M, the rate constant for electron transfer (ET) across the ITIES decreased in a manner consistent with the surfactant blocking the area available for the reaction. The decrease in rate constant with increasing surfactant concentration was successfully analyzed in terms of Langmuirian adsorption of the surfactant, with an equilibrium constant of (2.72 ± 0.06) × 104 M-1. The overall behavior observed indicates that the ET reaction occurs primarily at the portion of the ITIES free from surfactant.",
keywords = "Electron transfer, Liquid|liquid interface, SECM, Triton X-100",
author = "Jie Zhang and Unwin, {P. R.}",
year = "2000",
month = "12",
day = "1",
doi = "10.1016/S0022-0728(00)00311-9",
language = "English",
volume = "494",
pages = "47--52",
journal = "Journal of Electroanalytical Chemistry",
issn = "1572-6657",
publisher = "Elsevier",
number = "1",

}

Effect of Triton X-100 on electron transfer kinetics at the interface between two immiscible electrolyte solutions : A scanning electrochemical microscopy study. / Zhang, Jie; Unwin, P. R.

In: Journal of Electroanalytical Chemistry, Vol. 494, No. 1, 01.12.2000, p. 47-52.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Effect of Triton X-100 on electron transfer kinetics at the interface between two immiscible electrolyte solutions

T2 - A scanning electrochemical microscopy study

AU - Zhang, Jie

AU - Unwin, P. R.

PY - 2000/12/1

Y1 - 2000/12/1

N2 - Adsorption of the nonionic surfactant, Triton X-100, at the interface between two immiscible electrolyte solutions (ITIES) and its effect on the oxidation of decamethyl ferrocene in 1,2-dichloroethane by aqueous Ru(CN)63- has been investigated using scanning electrochemical microscopy. As the concentration of Triton X-100 in the aqueous phase was increased from 0 to 2.5 × 10-4 M, the rate constant for electron transfer (ET) across the ITIES decreased in a manner consistent with the surfactant blocking the area available for the reaction. The decrease in rate constant with increasing surfactant concentration was successfully analyzed in terms of Langmuirian adsorption of the surfactant, with an equilibrium constant of (2.72 ± 0.06) × 104 M-1. The overall behavior observed indicates that the ET reaction occurs primarily at the portion of the ITIES free from surfactant.

AB - Adsorption of the nonionic surfactant, Triton X-100, at the interface between two immiscible electrolyte solutions (ITIES) and its effect on the oxidation of decamethyl ferrocene in 1,2-dichloroethane by aqueous Ru(CN)63- has been investigated using scanning electrochemical microscopy. As the concentration of Triton X-100 in the aqueous phase was increased from 0 to 2.5 × 10-4 M, the rate constant for electron transfer (ET) across the ITIES decreased in a manner consistent with the surfactant blocking the area available for the reaction. The decrease in rate constant with increasing surfactant concentration was successfully analyzed in terms of Langmuirian adsorption of the surfactant, with an equilibrium constant of (2.72 ± 0.06) × 104 M-1. The overall behavior observed indicates that the ET reaction occurs primarily at the portion of the ITIES free from surfactant.

KW - Electron transfer

KW - Liquid|liquid interface

KW - SECM

KW - Triton X-100

UR - http://www.scopus.com/inward/record.url?scp=0034351310&partnerID=8YFLogxK

U2 - 10.1016/S0022-0728(00)00311-9

DO - 10.1016/S0022-0728(00)00311-9

M3 - Article

AN - SCOPUS:0034351310

VL - 494

SP - 47

EP - 52

JO - Journal of Electroanalytical Chemistry

JF - Journal of Electroanalytical Chemistry

SN - 1572-6657

IS - 1

ER -