I am working on green synthesis of metal oxide nanoparticles. After it synthesis what is the best way to store these nanoparticles for longer period of time before their biological applications.
One can store the nanoparticles either as solid or as suspension in a solvent. It all depends upon the stability of the nanoparticles.
In each case, agglomeration of the particles is possible, however in the case of suspension, nanoparticles can be suspended for a longer time and hence will be dispersed. For solid samples, you have to disperse them with the help of ultrasonication, prior to use.
For example
Gold and silver nanoparticles are usually kept in the form of suspension, away from light at 2–10 °C.
Carbon materials like CNTs, Graphene, GO, etc can be stored in solid as well as in suspended form. Same is the case for inorganic materials like metal oxides and composites.
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