Is it necessary to stabilize Fe3O4 nano particles with a surfactant like citric acid for preparing Fe3O4 @ZnO core shell using precipitation method?

Normally after synthesizing Fe3O4 uncoated nanoparticles it is very difficult to stabilise them in water.

How is it possible to stabilize with a surfactant so that ZnO shell can be prepared over it in the second step?

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