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PDMS two layer device fabrication

made on 16.05.2011

Materials

• flow and control layer molds
• Sylgard 184 silicone elastomer kit: Base part and a Curing agent
• TMCS

Method

1. Place moulds into a TMCS vapor chamber for twenty minutes
2. Control layer mixture: 20g Base + 4g Curing agent
3. Mix for 1 minute, degas for 2 minutes (standard protocol)
4. Pour onto control layer mold and place mold in vacuum chamber for at least 20min
5. Flow layer mixture: 20g Base + 1g Curing agent
6. Mix for 1 minute and degas for 2 minutes (standard protocol)
7. Spin coat onto flow layer at 2200-2400rpm for 35secs
8. Remove control layer mold from vacuum chamber, making sure no bubbles are left on the surface (remove with a toothpick if you see some )
9. Place the control and flow layer in a 80C convection oven and incubate for 30 minutes (timing is critical here!)
10. Remove casts from oven, cut out control layer, punch holes, and align to flow layer
11. Put aligned device back into 80C oven and incubate for at least 90 minutes (and here you can increase the backing time)
12. Remove devices from oven, cut them out and punch flow layer holes