Monday, 31 October 2005 - 9:30 AM
33c
Interfacial Flows Driven by Redox-Active Amphiphiles
Nicholas L. Abbott, Department of Chemical Engineering, University of Wisconsin, 1415 Engineering Drive, Madison, WI 53706 and Michael D. Graham, Chemical and Biological Engineering, University of Wisconsin - Madison, 1415 Engineering Dr, Madison, WI 53706-1691.
This paper will report on Marangoni flows generated at the surfaces of aqueous solutions by using redox-active amphiphiles in combination with electrochemical methods. First, when using amphiphiles that are insoluble in aqueous phases, electrochemical oxidation of the amphiphiles leads to an increase in surface pressure exerted by the amphiphiles, which in turn can drive Marangoni flows. Experimental evidence based on cyclic voltammetry supports the existence of these surface flows. Second, when using soluble amphiphiles that change their partitioning between a surface and bulk solution upon electrochemical oxidation, surface driven flows are demonstrated to be controlled by the kinetics of desorption of the amphiphiles from the interface. The use of these electrochemically-controlled surface flows to achieve rapid mixing in small volumes of liquid will be discussed
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