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Mapping Solvent Entrapment in Multiphase Systems by Electrogenerated Chemiluminescence
Matthew W Glasscott1, Silvia Voci1, Philip J Kauffmann1
1Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 24, 2021
Summary
We quantified immiscible solvent entrapment at electrode interfaces using microscopy-coupled electrogenerated chemiluminescence (ECL). This method accurately measures true microdroplet/electrode contact area by distinguishing aqueous and solvent phases.
Area of Science:
- Electrochemistry
- Surface Science
- Analytical Chemistry
Background:
- Quantifying interfacial properties in multiphase systems is challenging.
- Immiscible solvent entrapment can lead to inaccurate measurements of contact area.
Purpose of the Study:
- To develop a method for observing and quantifying immiscible solvent entrapment on electrode surfaces.
- To accurately determine the true microdroplet/electrode contact area.
Main Methods:
- Utilized microscopy-coupled electrogenerated chemiluminescence (ECL).
- Employed tris(bipyridine)ruthenium(II) chloride ([Ru(bpy)3]Cl2) and sodium oxalate as ECL reagents.
- Drove ECL reaction in the aqueous phase for phase contrast.
Main Results:
- Quantified microdroplet radius and apparent contact area.
- Measured entrapped solvent contact area and number of solvent pockets.
- Successfully extracted true microdroplet/electrode contact area.
Conclusions:
- ECL imaging provides clear contrast to differentiate aqueous and entrapped solvent phases.
- The method allows for accurate determination of true contact area and statistical analysis of solvent entrapment probability.
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