Monodisperse emulsion generation via drop break off in a coflowing stream

P. B. Umbanhowar*, V. Prasad, D. A. Weitz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

471 Scopus citations

Abstract

We describe an experimental technique for the production of highly monodisperse emulsions (with minimum achievable polydispersities <3%). The phase to be dispersed is introduced into a coflowing, surfactant-laden continuous phase via a tapered capillary. Drops detach from the capillary when the streamwise forces exceed the force due to interfacial tension. Drop size is a function of the capillary tip diameter, the velocity of the continuous phase, the extrusion rate, and the viscosities and interfacial tension of the two phases. Emulsions composed of a variety of fluids and with drop sizes ranging from 2 to 200 μm have been produced using this technique.

Original languageEnglish (US)
Pages (from-to)347-351
Number of pages5
JournalLangmuir
Volume16
Issue number2
DOIs
StatePublished - Jan 25 2000

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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