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Li Jiang and David Erickson Light-Governed Capillary Flow in Microfluidic Systems Small 9

Version of Record online: 27 SEP 2012 | DOI: 10.1002/smll.201201778

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Light-governed flow actuation and valving is achieved through UV grafting of thermo-responsive poly(N-isopropylacrylamide) on a mixed carbon black-polydimethylsiloxane surface. By projecting light onto the chip, switchable hydrophobic and hydrophilic regions are created that guide flow. This technique could, in principle, be operated by sunlight, providing both the simple architecture and advanced functionality needed in point-of-care devices for resource-limited environments.

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