Dear Charchit, 

I attached a slide showing the work-flow of how we do anti-stick coating on PDMS and silicon. I hope it helps. 

Dear Charchit,

My method is virtually the same as that described by Aslan, however for PDMS I exposed the surface to an oxygen plasma for about 10s prior to silianisation, this increased the measured contact angles considerably.  You will most likely find one in a good cleanroom.  Don't put the sample down on glass inbetween processes, it will be well bonded!

Jonathan

Ah, yes. That I forgot to mention, as it is included in the cleaning procedure. Dear Jonathan is right. You better use O2 plasma or UV/Ozone cleaner for up to 3 minutes if you have access to one.

Thank you very much for your valuable reply. @Aslan @pepter. But I just have one more concern, is it really compulsory to do O2 Plasma or UV/Ozone treatment. Would TMCS evaporation be successfully possible without doing O2 Plasma or UV/Ozone treatment (Actually we don't have this treatment faculty in our group).?

Dear Charchit, I haven't tried without O2 plasma but I think it would possible to do without. You would know for sure if it worked or not, after doing the water droplet test. If the water droplets are highly mobile on the surface then you got what you want or else just be sure that you did everything right and wait for another night. :)

Thank you @aslan.

Can you tell me the change in Water Contact Angle for TMCS silanized PDMS surface as compare to Original PDMS.

I know for fresh PDMS, WCA is about 107-110 but what about TMCS on PDMS..??

Hi Aslan, Jonathan, Charchit,

I'm using TMCS to silanize an SU8 master for PDMS release.  Is silanization only a temporary thing or does this last for multiple (>20) PDMS releases?  

Many thanks in advance for your help.

@Simon

I've not done any surface characterisation to confirm but I never had to re-silanise my SU8 masters and have used them more than 20 times each.