In our method, we exfoliate Graphene into NMP. Now I want to isolate Graphene flakes by evaporating NMP from it
Dear Md.Akibul Islam,
NMB has high boiling point of about 200 C, and the evaporating process should be done at relatively high temperature which would affect graphene flakes and properties.
If you can withstand this properties modulation you can try 140 or 150 C for 24h.
I think this kind of drying process may cause agglomeration of your exfoliated graphene. It will be better to keep it in the NMP for a week or two and separate the supernatant liquid for future use. If you need bulk amount graphene, go for centrifuge, as Dr. Roy suggests and for less amount try to transfer that may be by spin coating, dip coating and any other.
If you have few ml soln (like 10-20 ml) then collect them by centrifugation and dry in Vac oven. But if you have a lot of soln (100 to few L) then you can use Vacuum Filtration (use NMP resistant filter paper with pore size less than Gr flake size) and dry them in Vac oven.
Good luck..
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