Method 1: Acid Treatment
This is actually a reversible bond, but is capable of holding upto
5-8psi of applied pressure.
- Stir PDMS chips in warm (50-80C) 0.1N hydrochloric acid for 2hrs
- Treat glass similarly but at room temp
- Rinse treated surfaces in 0.2um filtered deionized water
- Dry with air or N2
- Bring treated surfaces into intimate contact
- Anneal bond in an 80C oven for at least 4hrs (preferrably overnight)
Method 2: Flame Treatment
I have some consistency issues with this --- e.g. it works about 75% of
the time. I haven't tested this method enough to figure out why it
works. The bond is irreversible when it does work.
- Solvent clean both PDMS and glass surfaces to be bonded (Acetone ->
Methanol -> Repeat 2x and dry with Air or N2)
- Pass both surfaces 8-10x through a flame --- hold about 0.5" above
the bluest part of a bunsen burner. Each pass should not be more than
0.25s of dwell time in the flame
- Allow surfaces to cool (1-5min)
- Bring surfaces into intimate contact
- Let cure at RT overnight
Hope this helps
Lee