Patent ID: 11964220
Assignee: GUANGDONG UNIVERSITY OF PETROCHEMICAL TECHNOLOGY
Field: Chemical engineering (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 2:
3. The preparation method according to claim 1, wherein under the condition that the nanoparticle suspension comprises the silica-encapsulated Fe3O4 nanoparticle suspension, the silica-encapsulated Fe3O4 nanoparticle suspension is prepared by the following steps:
in a nitrogen gas atmosphere, successively adding alkaline solution and trisodium citrate in an aqueous solution of soluble iron(III) and iron(II) salts to undergo coprecipitation to obtain a hydrophilic Fe3O4 suspension; and
mixing tetraethoxysilane (TEOS) solution with the hydrophilic Fe3O4 suspension to undergo a hydrolysis-condensation reaction to obtain the silica-encapsulated Fe3O4 nanoparticle suspension.