Comparison of schemes for preparing magnetic Fe3O4 nanoparticles--颗粒学报PARTICUOLOGY

Hong, R., Li, J., Wang, J., & Li, H. (2007). Comparison of schemes for preparing magnetic Fe3O4 nanoparticles. China Particuology, 5(1), 186–191. https://doi.org/10.1016/j.cpart.2007.01.011

Comparison of schemes for preparing magnetic Fe₃O₄ nanoparticles

Ruoyu Hong ^a *, Jianhua Li ^a, Jian Wang ^a, Hongzhong Li ^b

a Department of Chemical Engineering and Key Laboratory of Organic Synthesis of Jiangsu Province, Soochow University, SIP, Suzhou 215123, China
b MPR Lab., Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China

10.1016/j.cpart.2007.01.011

Volume 5, Issues 1–2, February–April 2007, Pages 186-191

Received 23 August 2006, Accepted 12 January 2007, Available online 6 June 2007.

E-mail: rhong@suda.edu.cn

Highlights

Abstract

Magnetic Fe₃O₄ nanoparticles were prepared by means of coprecipitation using NH₃·H₂O in water and in alcohol, and using NaOH in water. A series of instruments such as SEM, TEM, HRTEM, FT-IR, XRD and VSM were used to characterize the properties of the magnetic nanoparticles. The results indicated that the magnetism of Fe₃O₄ nanoparticles synthesized using NH₃·H₂O in water was the highest, although the reaction time was the longest. The process using NaOH in water was the simplest and the reaction time was the shortest, but the particle characteristics were inferior to those of the other two methods. The mean size of magnetic Fe₃O₄ nanoparticles prepared by coprecipitation in alcohol was the smallest among the three, but the nanoparticles aggregated severely. The magnetic Fe₃O₄ nanoparticles were coated with oleic acid using saturated sodium oleate, and the polarity of the surface-modified nanoparticles was measured. Fe₃O₄ nanoparticles prepared using NH₃·H₂O, not NaOH, could be coated successfully and thoroughly.

Graphical abstract

Keywords

Magnetic; Nanoparticles; Coprecipitation; Fe₃O₄

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