Dear All,

I synthesized sulfonated reduced GO according to the litterature below. Now I have a very stable dispersion of sulfonated graphene oxide in water (may contain a little bit of HCl, sulfanilic acid), I tried to centrifugate it with 13000 rpm for 30 min and 9000 rpm for one hour... but the dispersion is still very stable. I read about adding an organic solvent (for example ethanol) to destabilize the dispersion and  make the centrifugation easier...did you try this method? or do you have a better  method to get rid of the water? thanks a lot!

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