Hydrolysis and amine-capping in a glycol solvent as a route to soluble maghemite γ-Fe2O3 nanoparticles

Abstract
The preparation of capped metal oxide nanoparticles through the hydrolysis of metal salts is made arduous by the difficulty of dissolving long organic chain capping agents in water; by performing the reaction in propylene glycol under reflux, instead of water, we are able to hydrolyse FeCl3 in the presence of n-octylamine to obtain (repeatedly) soluble, monodisperse ∼5 nm γ-Fe2O3 particles that display a tendency to aggregate into superlattices.

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