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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > March  >
In the Laboratory
Micelles in the Physical Chemistry Laboratory: Diffusion Coefficients and Half-Wave Potentials of Ferrocene
Kathryn R. Williams and Roberto Bravo
Department of Chemistry, University of Florida, Gainesville, FL 32611-7200
Cover
March 2000
Vol. 77 No. 3
p. 392
Abstract
In a new experiment for the physical chemistry laboratory, cyclic voltammetry and chronocoulometry are used to measure the diffusion coefficients and half-wave potentials for ferrocene (Fc) in three micellar media (dodecyltrimethylammonium bromide, cetyltrimethylammonium bromide, and sodium dodecylsulfate) and a simple supporting electrolyte (tetrabutylammonium bromide). The experiment presents an excellent opportunity for students to appreciate the use of surfactants as solubilizing media and to observe the effects of micelle size and charge on both the diffusion coefficient of the ferrocene molecule and the E1/2 of the Fc+/Fc couple.
Supplement
Determination of Diffusion Coefficients, experimental methods, Pre-Lab Exercise, and Data Analysis are included.
*  Contents
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More Information
*  Citation
 Williams, Kathryn R.; Bravo, Roberto. J. Chem. Educ. 2000 77 392.
*  Keywords
 Physical Chemistry; Diffusion; Electrochemistry; Micelles; ferrocene
*  History
 Created:
Last Updated:		 February 14, 2000
August 31, 2005
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