Patent ID: 8557337

Claim:
A method for manufacturing bifunctional magnetic core-ceramic shell nanocrystals in a sequential process, the method comprising: mixing magnetic core material precursors with a reducing agent for the core material precursors; mixing the magnetic core material precursors and the reducing agent with an organic solvent for the magnetic core material precursors and the reducing agent and with a surfactant Poly(Ethylene Oxide)-Poly(Propylene Oxide)-Poly(Ethylene Oxide) (PEO-PPO-PEO) and forming a first mixture solution; heating the first mixture solution to a first temperature above 200° C. and maintaining the first mixture solution for a first time; cooling the first mixture solution to room temperature and forming magnetic core materials; mixing the magnetic core materials with ceramic shell material precursors and a reducing agent for the ceramic shell material precursors and forming a second mixture solution; heating the second mixture solution to a second temperature and maintaining the second mixture solution for a second time; and cooling the second mixture solution to room temperature and coating the magnetic core materials with the ceramic shell materials, wherein the core is Fe 3 O 4 and the shell is Ca 3 (PO 4 ) 2 .