Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 136, Issue 13, Pages 4849-4852Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja500713w
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Funding
- National Science Foundation [CHE-1111518]
- Department of Defense, Defense Threat Reduction Agency [HDTRA1-11-1-0005]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1111518] Funding Source: National Science Foundation
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We report an electrochemical study of the collisions of single droplets in an emulsion by two methods. In the first method, an electroactive redox species, for example, ferrocene, inside a toluene-in-water emulsion droplet (but not in the continuous phase) is measured by chronoamperometry during a collision with an ultramicroelectrode (UME). Here, a blip or spike type of collision signal is observed, representing electrolysis of the droplet contents. In the second method, electrochemical oxidation of an electroactive redox species in the continuous aqueous phase is hindered by a droplet blocking collision. In this case, a staircase current decrease is observed. From an analysis of single soft particle collision data, one can find the emulsion droplet size distribution and the droplet contents.
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