Will SU-8 Pillars Hold During Spincoating of PDMS?

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SUMMARY

The discussion centers on the mechanical stability of SU-8 pillars during the spincoating process of PDMS wells, specifically 50 µm in diameter and 100-200 µm deep. It is established that the SU-8 pillars can maintain their integrity if proper adhesion to the wafer is ensured, as poor adhesion can lead to pillars detaching during unmolding. Additionally, high-speed spinning may result in the loss of pillars, raising questions about the necessity of fast spinning in the context of creating wells rather than through-holes in PDMS.

PREREQUISITES
  • Understanding of SU-8 lithography techniques
  • Knowledge of PDMS properties and applications
  • Familiarity with spincoating processes
  • Experience with adhesion challenges in microfabrication
NEXT STEPS
  • Research SU-8 adhesion techniques for improved stability
  • Explore optimal spincoating speeds for PDMS applications
  • Investigate alternative methods for creating micro-wells in PDMS
  • Learn about the mechanical properties of SU-8 in microfabrication
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Microfabrication engineers, materials scientists, and researchers involved in developing PDMS-based devices will benefit from this discussion.

vbentiv
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I am trying to make PDMS wells (50 um diameter, 100-200 um deep) and was considering using a SU-8 mould fabricated by lithography. This would however mean that I would be making 50um diameter/100-200 um high pillars. I am unsure about the mechanical stability of this system. Will the pillars hold during spincoating of PDMS?
 
vbentiv said:
I am trying to make PDMS wells (50 um diameter, 100-200 um deep) and was considering using a SU-8 mould fabricated by lithography. This would however mean that I would be making 50um diameter/100-200 um high pillars. I am unsure about the mechanical stability of this system. Will the pillars hold during spincoating of PDMS?
Thanks to Greg for the "bump" :cool: which made me see that post by chance.
The SU8 pillars should be OK if you make sure that the adhesion to the wafer will be good (a typical problem is pillars coming off during unmoulding).
However, if you spin fast enough then I suppose that it will be possible to loose pillars too. It is unclear why for you it is necessary to spin (or at least, why you would spin fast) if you want to make wells. I could see why you would spin if you wanted to make through-holes in PDMS.
 

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