Morphological structure details, size distributions and magnetic properties of iron oxide nanoparticles

Ngoi, Kuan Hoon and Wong, Jia Chyi and Chiu, Wee Siong and Chia, Chin Hua and Jin, Kyeong Sik and Kim, Hyun-Joong and Kim, Hong-Chul and Ree, Moonhor (2021) Morphological structure details, size distributions and magnetic properties of iron oxide nanoparticles. Journal of Industrial and Engineering Chemistry, 95. pp. 37-50. ISSN 1226-086X, DOI

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This study reports the first morphology and crystalline structure details of iron oxide nanoparticles in a comprehensive manner. A series of iron oxide nanoparticles were synthesized in 1-octadecene from iron(III) acetylacetonate with the aid of oleic acid surfactant and then followed by post thermal processes. Quantitative small and wide angle X-ray scattering analyses using synchrotron radiation sources were performed together with electron microscopy, infrared spectroscopy and thermogravimery, providing morphology and crystalline structure details. Larger size of nanoparticles are synthesized by higher loading of the surfactant. Prolate ellipsoidal nanoparticles, rather than spherical particles, are always synthesized in single unimodal and narrow size distribution. The individual particles are composed of core, core-shell interface, shell, and shell-surfactant interface, regardless of the sizes. Magnetite-like crystalline phases are predominant. In addition, wuestite-like crystalline phases are discernible as minor components. For a given particle, the size and distribution are varied very little by the post thermal proccesses. Nevertheless, the other morphology characteristics, as well as the crystalline phases are significantly influenced through the post thermal process with a mixture of nitrogen and oxygen. In particular, the core part is thickened, the density gap between the core and the shell is reduced, and ferrimagnetic magnetite-like crystallites are enlarged and more populated. Paramagnetic wuestite-like crystalline phases are decreased substantially or disappeared completely. These enhanced morphology and crystalline characteristics make great contributions to improve magnetization performances significantly. Overall, this study provides the well-controlled synthetic schemes and morphology/crystalline structure details that are essential for better applications of iron oxide nanoparticles in various advanced fields including biomedicine and nanotechnology. (c) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

Item Type: Article
Funders: UKM [Grant No: DIP-2019-003], CEKO Co., Inc.
Uncontrolled Keywords: Iron oxide nanoparticle synthesis; Morphological structure; Nanoparticle shape; Unimodal size distribution; Magnetite-like crystals; Wuestite-like crystals; Magnetization characteristics; Synchrotron X-ray scattering analysis; Electron microscopy; Infrared spectroscopy; Thermogravimetry; Vibrating sample magnetometry
Subjects: Q Science > QD Chemistry
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science
Depositing User: Ms Zaharah Ramly
Date Deposited: 21 Jun 2022 08:19
Last Modified: 21 Jun 2022 08:19

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