RECYCLABLE SUPERPARAMAGNETIC NANOPARTICLES AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide superparamagnetic nanoparticles having a high surface charge, a uniform particle size and excellent water-dispersibility and a method for producing the same, namely, superparamagnetic nanoparticles exhibiting a small hydrodynamic size of 20 nm or less and a monodispersed distribution and a method for producing the same.

SOLUTION: A superparamagnetic nanoparticle comprises: superparamagnetic nanocrystals of 20 nm or less in size; and molecules having 3 to 5 carboxyl groups and bonded to surfaces of the superparamagnetic nanocrystals. A method for producing the superparamagnetic nanoparticles includes the steps of: preparing an alkaline solution with pH 10 to 14; producing a mixed solution in which the molecules containing 3 to 5 carboxyl groups, a divalent transition metal and ferric precursors are dissolved; and adding the mixed solution into the alkaline solution.

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