Controllable production of Janus ligaments by AC fields in a flow-focusing junction
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We report the production of bicomponent Janus filaments of miscible aqueous fluids in a microfluidic electro-flow-focusing device under the action of an AC electric field. The production of liquid filaments can lead to the generation of microfibers by adding a subsequent process of polymerization. Janus microfibers are of paramount importance in biomedical applications such as tissue production on crimped scaffolds. We show that the filament length is a function of the frequency signal, voltage amplitude and of the viscosity and conductivity of the dispersed phase. In particular, Janus filaments with diameters \(\sim 10\,\upmu\)m and longer than 1 mm are produced by AC voltages with frequencies below 150 kHz and a viscosity of the dispersed phase \(\sim 10\,\) cP.
KeywordsAC electric field Flow focusing Microfluidics Janus
The authors would like to acknowledge financial support from Spanish Government Ministry MEC under Contracts DPI2016-78887-C3-1-R and FIS2014-54539-P. They would also like to acknowledge the technical assistance of S. Schlautman in the fabrication of the microfluidic devices.
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