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Stage 2 - 1st Trial
Problems• Thickness of PDMS
layers• Interconnects • Delamination• Air bubbles
Stage 2 - 2nd Trial
Fabrication• Successfully made and
aligned four layers• Layers had very few
defects• All interconnects joined
two different layers• Entire wafer looked very
good- no rough edges, no air bubbles between layers, no craters
Phase 2 - 2nd TrialSuccesses & Problems
• Liquid to flow in all channels– all the way through 2
out of 5 channels
• Tracked fluid flow using bright food coloring
• Tested the effects of vertical interconnects
• No capillary action– had to use pressure
from syringe• problems
• Pressure caused delamination
• Effects of vertical interconnects
Processing Problems
• Substantial amount of cracks in SU-8 layer
• Layer alignment problems– Razor blade/ tweezers method– Layer thickness– Wrinkles– Air pockets
Cracks in reservoir region of SU-8 mold
Processing Problems Continued
• Feature alignment– Extremely difficult– Inaccurate
• Interconnect layer– No connection provided– Problem with layer thickness
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