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Mustafa Tahsin Guler,Murat Inal,Ismail Bilican 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
In this study, a new method for the fabrication of polydimethylsiloxane (PDMS) microchannels throughthe replication of plexiglass molds was developed. A plexiglass slab is machined with CO2 laser in theraster mode to produce the mold for the PDMS casting. Then, the PDMS replica of the mold is plasmabonded to a substrate by applying more pressure than standard to overcome the surface roughnessinherited from the laser machining process. Depending on the channel complexity, a ready to cast mold inthe size of a glass slide can be achieved in 5–20 min, including the design, machining, and cleaning steps. This fully automated and cost-effective mold making method proved to be the fastest among all methods,and it enables up to 2.5 aspect ratio microchannels, down to a width of 60 mm, and a height of 23 mm. Theraster mode of the laser provides features lower, in size, then the laser beam waist radius. The producedmicrochannels were validated using several applications, such as droplet generation, nanofiberproduction, and viscoelastic microparticle focusing.