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Opposed flow focusing: evidence of a second order jetting transition

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)8344-8351
Number of pages8
JournalSoft Matter
Volume14
Issue number41
Early online date8 Oct 2018
DOIs
DateAccepted/In press - 30 Sep 2018
DateE-pub ahead of print - 8 Oct 2018
DatePublished (current) - 7 Nov 2018

Abstract

We propose a novel microfluidic “opposed-flow” geometry in which the continuous fluid phase is fed into a junction in a direction opposite to the dispersed phase. This pulls out the dispersed phase into a micron-sized jet, which decays into micron-sized droplets. As the driving pressure is tuned to a critical value, the jet radius vanishes as a power law down to sizes below 1 μm. By contrast, the conventional “coflowing” junction leads to a first order jetting transition, in which the jet disappears at a finite radius of several μm, to give way to a “dripping” state, resulting in much larger droplets. We demonstrate the effectiveness of our method by producing the first microfluidic silicone oil emulsions with a sub micron particle radius, and utilize these droplets to produce colloidal clusters.

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via the Royal Society of Chemistry at https://doi.org/10.1039/C8SM00700D . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 1.13 MB, PDF document

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