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Acidification of Reverse Micellar Nanodroplets by Atmospheric Pressure CO₂

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Nancy E. Levinger*, Lauren C. Rubenstrunk, Bharat Baruah, and Debbie C. Crans*

Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States

J. Am. Chem. Soc., 2011, 133 (18), pp 7205–7214

DOI: 10.1021/ja2011737

Publication Date (Web): April 20, 2011

*E-mail: Nancy.Levinger@ColoState.edu; Debbie.Crans@ColoState.edu.

† Author Present Address

Department of Chemistry and Biochemistry, Kennesaw State University, Kennesaw, GA 30144.

Abstract

Water absorption of atmospheric carbon dioxide lowers the solution pH due to carbonic acid formation. Bulk water acidification by CO₂ is well documented, but significantly less is known about its effect on water in confined spaces. Considering its prominence as a greenhouse gas, the importance of aerosols in acid rain, and CO₂-buffering in cellular systems, surprisingly little information exists about the absorption of CO₂ by nanosized water droplets. The fundamental interactions of CO₂ with water, particularly in nanosized structures, may influence a wide range of processes in our technological society. Here results from experiments investigating the uptake of gaseous CO₂ by water pools in reverse micelles are presented. Despite the small number of water molecules in each droplet, changes in vanadium probes within the water pools, measured using vanadium-51 NMR spectroscopy, indicate a significant drop in pH after CO₂ introduction. Collectively, the pH-dependent vanadium probes show CO₂ dissolves in the nanowater droplets, causing the reverse micelle acidity to increase.

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History

Published In Issue May 11, 2011
Article ASAPApril 20, 2011
Received: February 16, 2011

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