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Electrocoalescence of drops synchronized by size-dependent flow in microfluidic channels
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10.1063/1.2218058
/content/aip/journal/apl/88/26/10.1063/1.2218058
http://aip.metastore.ingenta.com/content/aip/journal/apl/88/26/10.1063/1.2218058
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Drop velocities divided by the average velocity of the fluids injected as a function of the drop length divided by channel height. The filled symbols represent drop velocities measured before merging and the open symbols represent drop velocities after merging two streams of different-sized drops. The solid line is fluid velocity averaged across the cross-sectional area of the drop in the Poiseuille profile. The lower inset shows side and top views of drops depending on their size. The upper inset shows a cross-sectional schematic of the channel with the electrodes.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Schematic view of the device. Water drops with two different sizes are independently formed using two T junctions and are merged into a single channel. After a small drop catches up with a big drop they are coalesced by an electric field. The coalesced drops travel along a long delay channel, allowing observation of chemical reactions inside the drops as a function of time. (b) An image showing streams of drops with two different sizes being merged and synchronized. The two different drops are generated at about the same rate by adjusting oil and water flow rates in each T junction. (c) Drops being coalesced by an electric field when they pass the electrodes. The locations of the transparent ITO electrodes have been indicated as rectangles.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Fluorescent intensity as a function of time at different substrate concentrations. The solid lines are linear fits to obtain reaction rates. The inset shows a fluorescence image of the delay channel with exposure time, which averages fluorescence from about 400 drops. The error bars are the standard deviations of ten replicates. (b) Michaelis-Menten plot of the reaction rates as a function of the substrate concentration. The error bars fall within the symbols.

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/content/aip/journal/apl/88/26/10.1063/1.2218058
2006-06-29
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electrocoalescence of drops synchronized by size-dependent flow in microfluidic channels
http://aip.metastore.ingenta.com/content/aip/journal/apl/88/26/10.1063/1.2218058
10.1063/1.2218058
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