Journal
LAB ON A CHIP
Volume 9, Issue 4, Pages 613-618Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b810256b
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Funding
- Deutsche Forschungsgemeinschaft [RI 1294/2-1, RI 1294/3-1]
- Heisenberg Fellowship
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This paper describes two types of polymeric micropumps based on the temperature-sensitive hydrogel poly(N-isopropylacrylamide). The gel actuators are realised as photopolymerised patterns and microgels. They are electrothermically controlled by resistive heating elements. The diffusion-based micropump contains a photopatterned monolithic actuator, which is placed within the pump chamber, and provides a valveless single layer set-up. The diffusion micropump is intended for low performance applications and can operate in two modes: peristaltic or pulsatile. The maximum operating parameters are a flow rate of 2.8 +/- 0.35 mu l min(-1) and a back pressure of 1.28 kPa. The second type, a displacement pump, provides a higher performance (maximal 4.5 mu l min(-1) and 15 kPa). The pump comprises a microgel-based actuator, which is placed within a separate actuator layer, and active microvalves. The specific features of the design and performance of the pumps are discussed.
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