Hi, how to collect nanoparticles after complete evaporation of solvent by magnetic stirring?

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Sujoy Sarkar

Hi,

Its depend on you what you want to do next??? If you want to characterize it then scratch the material and go further. Alternatively, you could drop coat the solution on a clean glass plate and dry it. repeat the procedure again and again until you see that NPs layer is thick enough, you can go for characterization.

Giulia Fulias

Thanks Sujoy, scratches the material would not cause the change in nanoparticles shape? I mean to say particles will not remain round. Kindly correct me if I am saying wrong.

The percentage of shape deformation of the NPs will be very less in terms of bulk amount. So if you really want to consider this shape change, then after evaporating the solvent, you dispersed again in IPA or ethanol and characterize them.

Thanks once again, can the nanoparticles dispersed in ethanol or IPA be used for characterization? Donot they require the nanoparticles in dry form for characterization?

Of course you need to dry for the characterization. But once again, its depend on what characterization you want to carry forward. As for example, if you want UV-Vis then you need solution phase. SEM and TEM also need to be dispersed in solution, followed by drying.

Thank you. After preparation of NPs when i centrifuge then I see very fine particles but when i evaporate it by magnetic stirrer I just find a layer but no discrete particles.

Titus Sobisch

Obviously your procedure does not work as intended. Particles agglomerate into a layer. You may try spray drying or similar. Even then agglomeration into larger particles can be expected.