Hello Everyone, I tried to form ZnS nanoparticles using the hot injection method and was able to form the same (confirmed by XRD).

When I centrifuged, after the reaction I got a kind of white powder. I kept the centrifuged sample in a centrifuge tube and left it in the rack. After a day I don't know what exactly happened to it, it became pasty or liquidish (attached image). Can you please explain what might have happened?

( I feel it is moisture sensitive and has trapped the moisture)

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