I want to prepare graphene quantum dots by partial pyrolysis of citric acid. One step of this process is to carry out the dialysis of the obtained GQD solution to remove unreacted citric acid. What is the next step after dialysis? Do I dry the GQD in oven or freeze dry it. And if I decide to leave the GQD as a solution then how to determine its concentration?
I have the same question even, I have prepared GQD'S WITH ELECTROCHEMICAL OXIDATION METHOD, now how can I check the concentration of materials inside the aqueous solution consisting of citric acid, NaOH, H2O2
Freeze drying (lyophilisation) would be a good way to obtain your particles in solid form. And then, reconstitute the power in a known volume of your solvent to obtain the final concentration.
If you think that your powder obtained would be of a very small mass, then it is better to get the mass of your sample and the glass vial before lyophilisation and compare the mass after lyophilisation. The difference would be the mass of your sample that has freeze dried.
All the best.
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