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High-throughput formation and control of monodisperse liquid crystals droplets driven by an alternating current electric field in a microfluidic device
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10.1063/1.4813880
/content/aip/journal/apl/103/3/10.1063/1.4813880
http://aip.metastore.ingenta.com/content/aip/journal/apl/103/3/10.1063/1.4813880
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Design of the used microfluidic device.

Image of FIG. 2.
FIG. 2.

Flow diagram of the MBBA in oil. Different regimes are observed: ( ) stable , ( ) jetting regime (), and ( ) dripping regime ().

Image of FIG. 3.
FIG. 3.

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  = 10.5 , kHz, and  = 2.09 kV. Scale bar = 100 .

Image of FIG. 4.
FIG. 4.

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  = 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.

Image of FIG. 5.
FIG. 5.

Droplet size () and droplet production frequency () vs. the forcing frequency (). We observe a monodisperse regime for 1 kHz 1.8 kHz (for which ).

Image of FIG. 6.
FIG. 6.

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.

Image of FIG. 7.
FIG. 7.

Experimental and calculated (dashed curves) droplets size vs. and the “natural” forcing frequency .

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/content/aip/journal/apl/103/3/10.1063/1.4813880
2013-07-17
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-throughput formation and control of monodisperse liquid crystals droplets driven by an alternating current electric field in a microfluidic device
http://aip.metastore.ingenta.com/content/aip/journal/apl/103/3/10.1063/1.4813880
10.1063/1.4813880
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