Preparation and characterization of NiO(core)/Fe2O3(shell) composite particles |
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| Affiliation: | 1. Department of Chemical Engineering, Faculty of Science and Technology, University of the Basque Country UPV/EHU, PO Box 644, E-48080 Bilbao, Spain;2. Department of Chemical Engineering, Faculty of Pharmacy, University of the Basque Country UPV/EHU, Paseo de la Universidad, 7, 01006 Vitoria, Spain |
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| Abstract: | A novel hydrothermal coating process has been developed to deposit amorphous Ni(OH)2·H2O over octahedral α-Fe2O3 particles by treating aqueous dispersion of the preformed cores in Ni(NO3)2/CH3COONa solution. NiO(core)/Fe2O3(shell) composite particles were prepared by air sintering of the Ni(OH)2·H2O(shell)/Fe2O3(core) particles at 200–500°C for 1–6 h. The changes of morphology, structure and weight of the hydrothermal and sintering products were studied by means of TEM, XRD, XPS, TG and IR analyzers. The nucleation and growth model was suggested for the non-isothermal decomposition of Ni(OH)2·H2O coatings and the kinetic equation was derived from the non-linear regression of the TG data. The activation in the thermal-decomposition process is 73.8 kJ mol−1 and the pre-exponential factor is 1.95×104 s−1. |
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