Is DMSO has doping effect on the polyaniline? If we prepare the PANI-CNT nanocomposites (DMSO as a common solvent for both )?
Anil, I had answered you privately that DMSO according to my experience has no negative effect on doping of PAni. You commented with a publication where it apparently showed that I was wrong. You sent me that publication - please show it to those here who may be interested to follow, then I will comment on this publication.
by the way, I would like to repeat my numerous statements that also DMSO is not a solvent for PAni (neither for CNT), but can be used as dispersion medium (resulting in colloidal systems which are fundamentally different from solutions).
Thank you Sir, for your reply. Sorry, I forget to attach that publication. I am attaching that publication. Please open the discussion on the basis of it.
The publication shows, that NMP is interacting with the protonation of PAni by *lightly sulfonated PS* (which was used there instead of strongly sulfonated one which is more usual), stronger than DMSO does. So my above statement is basically correct.
Here, when using lightly sulfonated PS, you can observe interaction (retardance of doping) because the local availability of SO3(-) groups is decreased (the sulfonc acid groups can not freely move in contrast to if you would use a low molecular weight sulfonc acid like p-toluene sulfonic acid which I always preferred.
Also using lightly sulfonated PS instead of heavily sulfonated one reduces the availability of sulfonic groups where they are needed (every second aniline unit), also for other reasons:
- you don't have a PAni solution, but a dispersion (I can not see how small the PAni particles have been in the dispersions they were preparing)
- it is almost impossible for the sulfonated PS chain to penetrte INTO the interior of the PAni particles
- however, DMSO (and more so NMP) will easily migrate into the particles and sit on certain interior adsorption sited (PAni particles are not compact, but - although quite dense - have cavities / openings.
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