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Issue 4, 2009
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Micropumps operated by swelling and shrinking of temperature-sensitive hydrogels

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Abstract

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 µl min−1 and a back pressure of 1.28 kPa. The second type, a displacement pump, provides a higher performance (maximal 4.5 µl 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.

Graphical abstract: Micropumps operated by swelling and shrinking of temperature-sensitive hydrogels

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Article information


Submitted
17 Jun 2008
Accepted
31 Oct 2008
First published
20 Nov 2008

Lab Chip, 2009,9, 613-618
Article type
Paper

Micropumps operated by swelling and shrinking of temperature-sensitive hydrogels

A. Richter, S. Klatt, G. Paschew and C. Klenke, Lab Chip, 2009, 9, 613
DOI: 10.1039/B810256B

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