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Single-layer membrane valves for elastomeric microfluidic devices
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Single-layer valve as seen from above with design parameters labelled. (b) Differential manometer used to measure pressure drop across the upper channel. When the valve is not actuated the fluid interface forms in the middle of the basin. (c) When the valve is actuated the interface forms higher up. (d) Calibration data of wall deflection in as a function of valve actuation pressure and (e) interface location in as a function of pressure difference between the upper and lower channels.

Image of FIG. 2.
FIG. 2.

Pressure drop across the constricted channel as a function of the valve actuation pressure. Maximum pressure drop is . (a) Effects of varying cross-linker concentration: , , , , , , . (b) Effects of varying channel height: , , . (c) Effects of varying channel width: , , . (d) Effects of varying valve head length: , , .

Image of FIG. 3.
FIG. 3.

Continuous flow control device. Total flow rate is . (a) Schematic of the device with axis definitions. (b) Enhanced image of the flowing tracer particles. (c) Flow profiles measured using PIV. (d) Average flow speeds for the upper and lower channels as a function of valve actuation pressure.

Image of FIG. 4.
FIG. 4.

Membrane valve steering device. Droplet production flow rates are inner water phase and outer oil phase. (a) When the valve is not actuated, drops go into the upper channel. (b) When the valve is actuated, drops are forced to go into the lower channel.


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Scitation: Single-layer membrane valves for elastomeric microfluidic devices