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Controlling Role of pH and Temperature on CoFe2O4 Nanostructures Produced by Hydrothermal Synthesis

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The hydrothermal synthesis (HS) of CoFe2O4 nanoparticles (NPs) has been investigated as a function of reaction temperature and pH, using complementary characterisation techniques of transmission electron microscopy and X-ray diffractometry. The HS of CoFe2O4 NPs (<25 nm) at pH ∼ 8 proceeded through the formation and dissolution of intermediate Fe(OH)3 and [FeCo3(OH)8]+·[Cl·H2O] phases with increasing reaction temperature. In contrast, HS of CoFe2O4 NPs (<50 nm) at pH ∼ 12 resulted in the formation of additional intermediate Co(OH)2, CoOOH and α-FeOOH phases, with residual α-Fe2O3 present in the final reaction product. This research demonstrates the size and phase purity of the CoFe2O4 NPs may be controlled through the formation and dissolution of the intermediate phases at various pH values in the alkaline pH regime.
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Document Type: Research Article

Publication date: November 1, 2012

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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