In the original preparation
reported by Massart, an aqueous mixture of ferric and ferrous
chloride in hydrochloric acid is added to ammonia solution. The
gelatinous precipitate is then isolated from the solution by
centrifugation or magnetic decantation without washing with
water. The synthesis of magnetite nanoparticles by this way has
the advantages of operation simplicity, the use of economic
reagents and it is still useful to study the influence of solution
conditions in the size of the precipitated particles