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On page 2665, K. Char, H. Yoon, and co‐workers present a direct and facile method to realize programmed asymmetric structures within microchannels. A photo‐polymerization with the directional transmission through an optically asymmetric film is exploited to fabricate asymmetric ratchets. Two examples to control the fluid speed, as well as the rate‐dependent channel filling, showing different dwell...
An asymmetric ratchet structure within microchannels is demonstrated by directionally guided light transmission for controlled liquid flow. A direct and facile method is presented to realize programmed asymmetric structures, which control the fluid direction and speed.
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