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Kuan Hoon Ngoi,Jia Chyi Wong,Wee Siong Chiu,Chin Hua Chia,진경식,Hyun-Joong Kim,김홍철,이문호 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
This study reports thefirst morphology and crystalline structure details of iron oxidenanoparticles in a comprehensive manner. A series of iron oxide nanoparticles were synthesizedin 1-octadecene from iron(III) acetylacetonate with the aid of oleic acid surfactant and thenfollowed by post thermal processes. Quantitative small and wide angle X-ray scattering analysesusing synchrotron radiation sources were performed together with electron microscopy, infraredspectroscopy and thermogravimery, providing morphology and crystalline structure details. Larger size of nanoparticles are synthesized by higher loading of the surfactant. Prolate ellipsoidalnanoparticles, rather than spherical particles, are always synthesized in single unimodal andnarrow 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 arepredominant. In addition, wüestite-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 aresignificantly 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. Paramagneticwüestite-like crystalline phases are decreased substantially or disappeared completely. Theseenhanced morphology and crystalline characteristics make great contributions to improvemagnetization performances significantly. Overall, this study provides the well-controlledsynthetic schemes and morphology/crystalline structure details that are essential for betterapplications of iron oxide nanoparticles in various advancedfields including biomedicine andnanotechnology.
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