Journal Article10.1021/LA011571N
Preparation of Nanoporous Micrometer-Scale Hematite Particles by a Forced Hydrolysis Reaction in the Presence of Polyethylene Glycol
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TL;DR: In this article, the effect of poly(ethylene glycol) (PEG) on the formation of spherical hematite particles from a forced hydrolysis reaction in acidic FeCl3 solution was examined.
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Abstract: The effect of poly(ethylene glycol) (PEG) on the formation of spherical hematite particles from a forced hydrolysis reaction in acidic FeCl3 solution was examined. Spherical hematite particles were precipitated under all of the conditions studied, and the diameters of the particles increased from 400 to 1500 nm (1.5 μm) with increasing PEG concentration. The rate of phase transformation from β-FeOOH to hematite was decreased considerably at higher PEG concentrations as a result of the adsorption of PEG onto both β-FeOOH and primary polynuclear particles. The hematite particles formed with PEG were hydrohematite with a crystal lattice distortion, and they exhibited a polycrystalline nature. The nanoporous hematite particles were produced in the presence of PEG acting as a prominent templating agent. This study indicates that the forced hydolysis reaction in the presence of PEG is a successful and simple route for producing micrometer-scale nanoporous hematite particles.
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Citations
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Synthesis of α- and β-FeOOH iron oxide nanoparticles in non-ionic surfactant medium
TL;DR: In this paper, the forced hydrolysis of Fe(III) ions in acidic media was performed under controlled synthetic conditions to produce α- and β-FeOOH iron oxides.
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References
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Miguel A. Blesa,Egon Matijević +1 more
TL;DR: In this paper, the authors reviewed the available information regarding the pathways of processes leading to precipitation of iron (hydrous) oxides in aqueous salt solutions and discussed the importance of the early hydrolysis stages in determining the nature and the morphology of the solid phases.
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Structure and mechanisms of formation of iron oxide hydroxide (chloride) polymers
TL;DR: In this article, the authors presented the results of a study at the Groupe de Geochimie de l'Environnement, LGIT-IRIGM, Universite J Fourier et CNRS, BP 53X, 38000 Grenoble Cedex, France, and Centre de Recherche sur les Systemes MicroDivises (Laboratoire de Cristallographie), UMR 813 CNRS.
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Nonstoichiometric structures during dehydroxylation of goethite
Emilia Wolska,Udo Schwertmann +1 more
TL;DR: The deshydratation de α-FeOOH a basse temperature conduit a transformation complete en une phase de structure hematite avant que la moitie de la quantite stoechiometrique d'eau ne soit evacuee as discussed by the authors.
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