Ionic liquid-based compound droplet microfluidics for ‘on-drop’ separations and sensing??

Lab on a Chip Pub Date: 2010-08-10 DOI: 10.1039/C004853D

Abstract

We present a new and general scheme for analytical applications of droplet-based microfluidics in which flowing droplets function not only as isolated reaction flasks, but are also capable of on-drop separation and sensing. To demonstrate this, we choose ionic liquids as designer fluids whose chemical and physical properties can be tailored in task-specific fashion. We create aqueous–ionic liquid compound droplets with tunable structures using an imidazolium-based ionic liquid, and present two analytical applications—separation of a binary aqueous mixture of organic dyes and dynamic pH sensing—to highlight the salient features of this scheme. By combining designer fluids with designer microfluidic emulsions, our work opens up a rich space of exploration for analytical microfluidics.

Graphical abstract: Ionic liquid-based compound droplet microfluidics for ‘on-drop’ separations and sensing
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