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- W2023366130 abstract "The paper reports a green synthetic route for nanosized hematite colloids with an excellent monodispersity, using green vitriol and ammonia as raw materials. The reaction conditions of the synthetic route were studied and the as-prepared samples were characterized by XRD, TEM, TG-DTA, DLS, and XPS. The results indicated that the key factors for the monodispersity of the colloidal product were preheating reactants and washing repeatedly the intermediate Fe(OH) 3 . When the initial pH was set as 4 or 5, the transformation product of Fe(OH) 3 was the pure α -Fe 2 O 3 with the minim adsorptive sulfate ions. Contrarily, the mixtures of α -Fe 2 O 3 and α -FeOOH were obtained at the pH 6 or 7, which were related to the mechanism of transformation reaction. In addition, the concentration of Fe(OH) 3 should be less than or equal to 0.2 mol/L in order to prepare the qualified nanosized hematite colloids. The researches proved that the excellent monodispersity of the colloidal product resulted from a fine dispersion state of the synthetic system during the whole process and that it was a significant way to obtain the nanosized metallic oxide colloids from the corresponding metal hydroxide due to avoidance of hyperspeed centrifugal separation or dialysis operation." @default.
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- W2023366130 date "2014-01-01" @default.
- W2023366130 modified "2023-10-16" @default.
- W2023366130 title "Preparation and Characterization of Nanosized Hematite Colloids Using Green Vitriol as Ferrum Source" @default.
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- W2023366130 doi "https://doi.org/10.1155/2014/749562" @default.
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