I am following this procedure for PDMS channel and SU8 covered microchip using APTES 99% and oxygen plasma treatment. Both the chip and the PDMS channel are activated first by the plasma and afterwards the PDMS is dipped in APTES. After the attachment white particles are clogging the channel. I wonder if anyone else encountered it and how it can be avoided?
https://www.mdpi.com/2072-666X/6/12/1465
Thank you very much for your reply.
You mean there may some residuals from the SU8 development that once the APTES introduce to it result some parcipitates?
The SU8 looks clean but I will make sure again. The parcipitates appear mainly inside the channel (image attached). I will mention that the chip is cleaned in pirhana solution (1:7 hydrogen peroxide to sulfuric acid) before the bonding procedure
Yes I have used food coloring, it is not completely blocked but some of the electrodes loss their electrochemical signal.
Hello, particles can come from punching holes on the PDMS and from plastic gloves.
-Can you try to bond the devices without the treatment and check for particles?
-I am not sure what the picture is showing. A picture of the particles would help diagnose the issue.
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