Soft lithography experiments

A crucial contribution to the explosion of research activity in the field of microfluidics was the development of approachable procedures for microfabrication [4]. Fast prototyping via lithography and replication of the masters in polydimethylosiloxane - a technique often related to as soft-lithography [7] - made it possible to go from the idea to the fabricated chip within a day, with facile reproduction of the existing masters for multiple experiments [7]. 

Flow photolysis experiments are carried out in microfluidic channels see Note 7). We use soft lithography (14, 19), a well-established polymer molding procedure, to build our microdevices. The following steps are carried out in the clean and dry environment of a laminar flow bench. 

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