Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 44, Pages 11859-11862Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201407937
Keywords
chemiluminescence; electrochemistry; electron transfer; emulsions; spectroelectrochemistry
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Funding
- National Science Foundation Graduate Research Fellowship [DGE-1110007]
- National Science Foundation [CHE-1111518]
- AFOSR MURI [FA9550-14-1-0003]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1111518] Funding Source: National Science Foundation
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We provide evidence of single attoliter oil droplet collisions at the surface of an ultra-microelectrode (UME) by the observation of simultaneous electrochemical current transients (i-t curves) and electrogenerated chemiluminescent (ECL) transients in an oil/water emulsion. An emulsion system based on droplets of toluene and tri-n-propylamine (2:1 v/v) emulsified with an ionic liquid and suspended in an aqueous continuous phase was formed by ultrasonification. When an ECL luminophore, such as rubrene, is added to the emulsion droplet, stochastic events can be tracked by observing both the current blips from oxidation at the electrode surface and the ECL blips from the follow-up ECL reaction, which produces light. This report provides a means of studying fundamental aspects of electrochemistry using the attoliter oil droplet and offers complementary analytical techniques for analyzing discrete collision events, size distribution of emulsion systems, and individual droplet electroactivity.
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