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Effect of supporting electrolyte concentration on the electrochemical reaction of redox-active surfactant micelles in aqueous solutions

Effect of supporting electrolyte concentration on the electrochemical reaction of redox-active surfactant micelles in aqueous solutions

Authors :
Yukikazu Takeoka
Masayoshi Watanabe
Naoya Ogata
Takashi Aoki
Kohei Sanui
Source :
Journal of Electroanalytical Chemistry. 438:153-158
Publication Year :
1997
Publisher :
Elsevier BV, 1997.

Abstract

The effect of NaCl concentration on the redox potential of α-ferrocenylundecyl-ω-hydroxy-polyoxyethylene (FPEG) micelles has been studied in aqueous solutions. With increasing NaCl concentration, the anodic half-wave potentials E 1 2 of cyclic voltammograms of the aqueous solutions shift to higher potential, and the peak currents of the cyclic voltammograms decrease. The results are discussed in terms of thermodynamics of the micelle formation. An equation which interprets the correlation between the E 1 2 , the salt concentration, diffusion coefficient of the micelle DM, and the aggregation number m, has been derived. The changes in DM and m with NaCl concentration do not explain the change in the value of E 1 2 . The decrease in the equilibrium constant for the micelle-disruption Kd with increasing NaCl concentration affects the redox-potential of the FPEG micellar solutions.

Details

ISSN :
15726657
Volume :
438
Database :
OpenAIRE
Journal :
Journal of Electroanalytical Chemistry
Accession number :
edsair.doi...........c64b62927f93a4887dff3e7f874cc44f
Full Text :
https://doi.org/10.1016/s0022-0728(97)00128-9