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Nonhydrolytic sol-gel synthesis: Microstructural and morphological study on nickel ferrite nanocrystals coated with oleic acid

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Abstract

Nickel ferrite nanostructured particles coated with chemisorbed oleic acid were successfully synthesized by nonhydrolytic sol-gel method. By varying the composition of metal precursors, two microstructures were obtained, i.e., dispersed nanocrystals (9.7 ± 1.8 nm) and submicron aggregates (152 ± 21 nm) consisted of many nanocrystals (8.1 ± 1.3 nm). Because oleic acid could form complex with iron (III) ions, but not with nickel (II), increasing the concentration of iron precursor consumed more oleic acid and led to insufficient oleic acid coating on particle surface. Strong intercrystallite interaction was induced from less protected nanocrystals, and aggregation thus occurred between different crystallites.

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Acknowledgments

Support of this work by Academic Research Fund of National University of Singapore and the Office of Naval Research, USA, is acknowledged.

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  1. Department of Materials Science and Engineering, National University of Singapore, Singapore, 117574

    H. Yin & G.M. Chow

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  1. H. Yin
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Correspondence to G.M. Chow.

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Yin, H., Chow, G. Nonhydrolytic sol-gel synthesis: Microstructural and morphological study on nickel ferrite nanocrystals coated with oleic acid. Journal of Materials Research 23, 1922–1930 (2008). https://doi.org/10.1557/JMR.2008.0239

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