Abstract
We describe a flexible emulsification method using an electric field to generate droplets in a hydrodynamic-flow-focusing geometry in microchannels. The droplet size is controlled by the ratio of inner and outer flow rates as well as by the electric field. As the voltage increases, the droplet size decreases. A Taylor cone is formed and generates very fine droplets, less than 1μm in diameter. Small inner flow rates and high electric fields are required to form a stable Taylor cone in a dc electric field. An ac electric field produces tiny droplets periodically.
Highlights
Controlled production of emulsion drops using an electric field in a flow-focusing microfluidic device
Only a few experiments of emulsification in an electric field have been performed with one liquid in another
We carried out electrospray in a microfluidic emulsification device using a flowing-focusing geometry
Summary
“Controlled Production of Emulsion Drops Using an Electric Field in a Flow-Focusing Microfluidic Device.” Applied Physics Letters91 (13): 133106. Controlled production of emulsion drops using an electric field in a flow-focusing microfluidic device Haejune Kim Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843, USA
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