Campus Units

Chemistry

Document Type

Article

Publication Version

Published Version

Publication Date

5-28-2019

Journal or Book Title

Lab on a Chip

DOI

10.1039/C9LC00327D

Abstract

Ion concentration polarization (ICP) has been broadly applied to accomplish electrokinetic focusing of charged species. However, ICP-based extraction and enrichment of uncharged (neutral) compounds, important for pharmaceutical, biological, and environmental applications, has not yet been reported. Here, we report the ICP-based continuous extraction of two neutral compounds from aqueous solution, by their partition into an ionic micellar phase. Our initial results show that the efficiency of the extraction increases with the concentration of the surfactant comprising the micellar phase, reaching 98 ± 2%, and drops precipitously when the concentration of the target compound exceeds the capacity of the micelles. As a key feature relevant to the practical application of this method, we show that focusing occurs even an order of magnitude below the critical micelle concentration through the local enrichment and assembly of surfactants into micelles, thus minimizing their consumption. To underscore the relevance of this approach to water purification, this method is applied to the extraction of pyrene, a model for polyaromatic hydrocarbons. This approach provides access to a broad range of strategies for selective separation that have been developed in micellar electrokinetic chromatography.

Comments

This article is published as Berzina, Beatrise, and Robbyn Kimberly Anand. "Continuous Micellar Electrokinetic Focusing of Neutral Species Driven by Ion Concentration Polarization." Lab on a Chip (2019). DOI: 10.1039/C9LC00327D. Posted with permission.

Creative Commons License

Creative Commons Attribution-Noncommercial 3.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial 3.0 License

Copyright Owner

The Royal Society of Chemistry

Language

en

File Format

application/pdf

Included in

Chemistry Commons

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