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

Published online by Cambridge University Press:  31 January 2011

H. Yin  and
G.M. Chow
H. Yin
Affiliation:
Department of Materials Science and Engineering, National University of Singapore, Singapore 117574
G.M. Chow*
Affiliation:
Department of Materials Science and Engineering, National University of Singapore, Singapore 117574
*
a)Address all correspondence to this author. e-mail: [email protected]
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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.

Keywords

MicrostructureMorphologySol-gel
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 7 , July 2008 , pp. 1922 - 1930
Copyright
Copyright © Materials Research Society 2008

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