A fast and simple method to fabricate circular microchannels in polydimethylsiloxane (PDMS)

A coating of liquid PDMS is applied on the walls of square microchannels by introducing a pressurized air stream inside microchannels filled with PDMS. Surface tension of the liquid PDMS makes the coating take a circular cross section which is preserved by baking the device to cure the coated layer. Diameters ranging from a few to few hundred micrometers were achieved. Different coating conditions were systematically tested and design curves are reported to choose appropriate coating conditions for obtaining a desired diameter.

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