Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 42, Issue 1, Pages 95-100Publisher
SPRINGER
DOI: 10.1007/s10971-006-1515-5
Keywords
organic gel-thermal decomposition process; spinel ferrite fibres; NiFe2O4; spinnability
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Functional spinel ferrite fibers are attractive for high-tech applications. The spinel NiFe2O4 fibres have been successfully prepared by the organic gel-thermal decomposition process from raw materials of Ni, Fe nitrate salts and citric acid. The gel spinning performance was a major factor for preparation of uniform gel fibrous precursors. The gel spinnability was related to the citrate-metal complex structure and linear-type structural molecules [(C6H6O7)(4)NiFe2](n) for the gel precursor was possibly formed during the complexation reaction between the citric acid and metal ions at pH 5. The composition, structure of the gel precursors and products derived from thermal decomposition of these precursors were characterized by FTIR, XRD, and SEM. The thermal decomposition process of the gel precursors was investigated by TG-DSC. The prepared spinel NiFe2O4 fibres having grain sizes of 60-70 nm were featured with diameters of about 1 mu m, and aspect ratios up to 10(6) (length/diameter).
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