Description:  The three hydrogel posts in the top image form a valve at the end of a channel. The middle image shows the posts swollen up to close the channel. The posts swell when the pH of the fluid surrounding them changes. The bottom image is a diagram that shows the posts in perspective.
Source:  University of Illinois
Story:  Gels make micro plumbing
TRN January 3, 2001
TRN Categories:  Semiconductors and Materials; MicroElectroMechanical Systems
Form:  Still

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