Microflow Switch

CapOlatity-driven stop valve and sample injection switch Microflow switch Multichannel micro liquid dosing system Multichannel microswitch pumping... 

Using a stainless-steel microreactor, Ushiogi et al. (2007) reported a microflow system capable of synthesizing unsymmetrical diarylethenes, a process that is notoriously difficult to achieve in conventional batch systems. As Scheme 62 illustrates, diarylethenes are of synthetic interest due to their ability to change color via a reversible switching between two distinct isomers, which occurs as a result of light absorption. 

The design in this case-study prototype device remains an issue for the reversible motion of the liquid. This case-study prototype device could be effectively used for the one shot of liquid in both single-output and multi-output modes on demand. For continuous random switch function, another problem appears if we turn on microchannel X first and desire to next turn on only microchannel Y where X>T. In this continuous switch function, the microchaimel X -f 1) will be also turned on in this case-study prototype device. Anyway, above issues could be resolved via the two-way bubble actuator design [18, 19], which could make the fluid flow backward in the unwanted microchannel. In addition, this microfluidic switch has the potential to be integrated into a wider fluidic network system with stop valves or microflow discretizers which could be used for separation of liquid segments from a continuous source. 

Electrowetting, Applications, Fig. 9 Electrowetting activated liquid stream switching in two-phase microflows. (a) No applied voltage, (b) Voltage applied (From Ref. [22])... 

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