I have graphene dispersed in NMP. Now I want to transfer the Graphene into IPA/Water. Vacuum filtration is the process I am using. But when I filter it, there is too little Graphene on the filter paper to collect. And if I put more solution to filter, the NMP remains in the solution since it does not dry well. Even if I keep it in the air for a log time, the result is same.
You can completely dry the filter paper in a vacuum oven. Keep the oven temp slightly higher than boiling point of NMP. After its completely dry, put the filter paper in a new solvent and sonicate for few hrs. All precipitated Gr from filter paper should be detached into the new solvent. Keep the filter paper very clean and free from any contamination, otherwise your contamination will be also in the new solvent.
I'm not sure of your filter disk size, but reducing this may help capture on a smaller surface.
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