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Design of the used microfluidic device.
Flow diagram of the MBBA in oil. Different regimes are observed: ( ) stable PF, ( ) jetting regime (J), and ( ) dripping regime (D).
Snapshots of the flow in region I and region II of the microfluidic device (a) without and (b) with application of an electric field for L = 10.5 , kHz, and V = 2.09 kV. Scale bar = 100 .
Snapshots of the flow pattern in the collector at kHz (a), kHz (b), kHz (c). A monodisperse regime is observed at for kV and LC jet width L = 10.5 . Scale bar = 100 . Large transparent circular structures are PDMS pillars which allow for the maintaining of a constant and homogenous depth of the observation chamber.
Droplet size (D) and droplet production frequency (f) vs. the forcing frequency (F). We observe a monodisperse regime for 1 kHz F 1.8 kHz (for which ).
Droplets fluorescence signal vs time and the corresponding flow pattern for two forcing frequencies in (a) the polydisperse regime: kHz and in (b) the monodisperse regime: kHz ( kHz). Black arrows represent the flow direction. Channel width = 30 . Micrographs and fluorescence signals were recorded in regions of the microfluidic channel located at a distance of about 2 mm of the electrodes.
Experimental and calculated (dashed curves) droplets size D vs. Qd and the “natural” forcing frequency .
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