Morphology and magnetic properties of α-Fe2O3 particles prepared by octadecylamine-assisted hydrothermal method--颗粒学报PARTICUOLOGY

Liu, Z., Lv, B., Wu, D., & Sun, Y. (2012). Morphology and magnetic properties of α-Fe2O3 particles prepared by octadecylamine-assisted hydrothermal method. Particuology, 10(4), 456–461. https://doi.org/10.1016/j.partic.2011.11.012

Morphology and magnetic properties of α-Fe₂O₃ particles prepared by octadecylamine-assisted hydrothermal method

Zhong Liu ^{a c}, Baoliang Lv ^a *, Dong Wu ^a, Yuhan Sun ^{a b}

a State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
b Low Carbon Conversion Center, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201203, China
c Graduate University of the Chinese Academy of Sciences, Beijing 100049, China

10.1016/j.partic.2011.11.012

Volume 10, Issue 4, August 2012, Pages 456-461

Received 14 September 2011, Revised 27 October 2011, Accepted 3 November 2011, Available online 20 March 2012.

E-mail: lbl604@sxicc.ac.cn

Highlights

Abstract

α-Fe₂O₃ particles with various morphologies, including micro-doublesphere, tetrakaidecahedron and nanoparticles-aggregated micro-ellipsoid, were successfully synthesized via an octadecylamine-assisted hydrothermal method. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). The results indicate that the presence of octadecylamine played a crucial role in morphology evolution by selective crystal adsorption. The protonated octadecylamine increased the pH value that accelerated nucleation, and the long alkyl groups of octadecylamine acted as an adsorption inhibitor to retard the growth of nanoparticles. The as-prepared α-Fe₂O₃ particles exhibited higher remanent magnetization and coercivity than other α-Fe₂O₃ particles of similar size. These properties should be attributed to the superstructure and the shape anisotropy of the synthesized particles.

Graphical abstract

Keywords

Octadecylamine; α-Fe₂O₃; Morphologies; Magnetic property

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