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Methods to Coalesce Fluorinated Pickering Emulsions

Abstract

This work surveys methods to coalesce water-in-fluorocarbon emulsions stabilized by amphiphilic nanoparticles (NPs) for applications in droplet microfluidics. Most droplet assays to-date have relied on one type of surfactants consisting of perfluorinated polyether and polyethylene glycol (PFPE-PEG) to stabilize the drops against coalescence. Nonetheless, this surfactant is known to have several limitations, the most severe of which being its mediation of inter-drop molecular transport leading to the cross-talk of droplet contents. Previously we addressed such challenge by replacing surfactants with amphiphilic NPs. The merging of NP-stabilized drops, however, is known to be more difficult than that of surfactant-stabilized drops due to the high energy barrier to desorb NPs from the interface. Here we compare the efficiency of droplet merging by different methods including centrifugation, freeze-thaw cycle, addition of chemical additives, and the application of electric field. The results from this work are useful as a selection guide for appropriate method to merge NP-stabilized drops.

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Publication details

The article was received on 22 May 2017, accepted on 10 Jul 2017 and first published on 11 Jul 2017


Article type: Technical Note
DOI: 10.1039/C7AY01289F
Citation: Anal. Methods, 2017, Accepted Manuscript
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    Methods to Coalesce Fluorinated Pickering Emulsions

    M. Pan, F. Lyu and S. K. Y. Tang, Anal. Methods, 2017, Accepted Manuscript , DOI: 10.1039/C7AY01289F

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