I want to modify the PDMS surface so that it is hydrophillic. Is the non-chemical based methods like UV/ozone/ plasma treatments better or the chemical methods of silane treatment better?
Thank you very much for your suggestions@ Md. Abdur Rahman @Philipp Schulze
From my experience very useful is the combination of physical and chemical methods. The first activation of PDMS in air RF plasma should be done - it is effective but not stable in time. Then immediately after plasma treatment chemical modification by APTS should be made. For example 30-60 minutes in 0,1 to 1% of APTS in an anhydrous solvent. Next 2-3 times were washing and drying. Same of solvent may be damaging for PDMS, may be isopropanol is worth to tray.
Have a nice day
Grzegorz
Dear Grishmi
You can also have a look here:
Article PDMS with designer functionalities—Properties, modifications...
Dear Grishmi
In my experience, PDMS surface modification by corona plasma treatment for coating multi-walled carbon nano tubes on the surface of PDMS was investigated. The corona (plasma) input power in the range of 180-500 W and the corona treatment time range of 2-6 min were investigated for MWCNT coating performance on PDMS surface. Based on experiments, in corona input power of more than 360 W and corona time of longer than 6 min, the surface of the PDMS was destroyed. Therefore, the maximum possible input power and time for corona were 360 W and 6 min, respectively. Based on obtained data, higher corona input power and longer corona time, lead to greater amount of MWCNT coating on PDMS and more surface roughness. Therefore, plasma treatment in my project was positive effect. If you need additional information can look for my paper entitles: Enhanced Ethanol Separation by Corona-Modified Surface MWCNT Composite PDMS/PES.PVP Membrane, JOM, 833 (2018) 1-9.
https://doi.org/10.1007/s11837-018-3158-8
Best regards
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