Nanoparticles form hydroixide after dispering in water?
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You need an hydrophillic surface. try to functionalize them with a molecule with a terminal OH moiety. Mercapto alcohols could work if they attach to the iron oxide surface, Another issue is the particle size, if they are very large they would precipitate at last. Have you tried for example with an emulsifier/surfactant such as TOPO, or some sulphonates. Let me know if it works! regards
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