The metal complex, [Ni(en)2(H2O)2](NO 3)2 (en = ethylenediamine), was decomposed in a static furnace at 200 °C by autogenous decomposition to obtain phase pure metallic nickel nanocrystallites. The nickel metal thus obtained was studied by XRD, IR spectra, SEM and CHN analysis. The nickel crystallites are in the nanometer range as indicated by XRD studies. The IR spectral studies and CHN analyses show that the surface is covered with a nitrogen containing species. Thermogravimetric mass gain shows that the product purity is high (93%). The formed nickel is stable and resistant to oxidation up to 350 °C probably due to the coverage of nitrogen containing species. Activation energy for the oxidation of the prepared nickel nanocrystallites was determined by non-isothermal methods and was found to depend on the conversion ratio. The oxidation kinetics of the nickel crystallites obeyed a Johnson-Mehl-Avrami mechanism probably due to the special morphology and crystallite strain present on the metal.
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Acknowledgements The authors thank Department of Science and Technology, India for using the Sophisticated Analytical Instrument Facility (SAIF) at the Sophisticated Test and Instrumentation centre (STIC), Cochin University of Science and Technology, Cochin, for SEM analysis. S. Manju thanks Kerala State Council for Science, Technology and Environment for research fellowship.
- Nano nickel
- Oxidation kinetics
ASJC Scopus subject areas
- Condensed Matter Physics
- Materials Chemistry
- Polymers and Plastics
- General Dentistry
- Physical and Theoretical Chemistry