After the synthesis of my nanoparticles using plant extract to bio-reduce silver, what solvent can I use to dissolve the already dried nanoparticles for biological assay?
The best thing to do is to run a solubility test with different solvents then you will find which solvent is better for your sample.
Rotimi Larayetan
A person is 70-80% water. Therefore, the best medicine solvent is water. In your dispersed system, the liquid in which the nanoparticles are distributed is not called a solvent, but a dispersant.
Good luck trying to “disperse” dry nanoparticles. Nanoparticles exist as single entities as part of a suspension.
Rotimi Larayetan You can dissolve silver in nitric acid. Then you have a solution and your dried silver 'nanoparticles' (fused aggregated and agglomerated residue) have gone into solution. You can then make silver nanoparticles with appropriate reduction of your silver nitrate solution. They will remain 'nano' if retained in colloidal form in liquid. If you dry them, then they will aggregate and no longer retain independent, discrete, and separate particles < 100 nm (i.e they won't be nano, by definition). You can then redissolve the dried silver material in nitric acid and repeat the process...
I concur with previous posters. You're probably wanting to re-disperse (not 'dissolve') your material, and, as Omar tells you above, you can't do that once your materials have dried. To keep them nano they need to be retained in stable form in the liquid where charge or steric stablilization can be used to keep them from aggregating.
Take a look at:
May 28th, 2019 Dispersion and nanotechnology
https://www.malvernpanalytical.com/en/learn/events-and-training/webinars/W190528DispNanoMat
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