Formation Mechanism of Monodispersed alpha-Fe2O3 Particles in Dilute FeCl3 Solutions

Journal of Colloid and Interface Science
Tadao Sugimoto, A Muramatsu

Abstract

Some ambiguity is still involved in the interpretation of the growth mechanism of monodispersed hematite (alpha-Fe2O3) particles in dilute FeCl3 solutions. Namely, there are two entirely different proposals on this issue, viz. aggregation of preformed primary particles of alpha-Fe2O3 itself and reprecipitation of the ionic species through dissolution of the preformed beta-FeOOH particles. In order to resolve this problem, the formation process was followed in detail through TEM, Electron Diffraction, XRD, FT-IR, and ICP spectrometry along with quantitative analyses on seed effects. As a result, it has been concluded that the nuclei of the hematite particles are initially generated with the formation of beta-FeOOH particles and that they are grown by deposition of the solute originally present in the solution phase and indirectly furnished from the beta-FeOOH by dissolution. As the concentration of the solute is lowered by the growth of the hematite particles, they continue to grow with the solute provided mainly from the beta-FeOOH in a steady-state of the dissolution of beta-FeOOH and growth of alpha-Fe2O3. The basic formation mechanism is common to the ellipsoidal particles grown in the presence of phosphate ions and spherica...Continue Reading

Citations

Mar 31, 2017·Scientific Reports·Victoria ReichelDamien Faivre
Jul 6, 2019·Chemistry : a European Journal·Johanna ScheckDenis Gebauer
Oct 3, 2018·Proceedings of the National Academy of Sciences of the United States of America·Helena Massana-CidPietro Tierno
Dec 21, 2017·Physical Chemistry Chemical Physics : PCCP·Khian-Hooi ChewKaoru Ohno
Jul 4, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Roberta BraynerAlain Couté
May 1, 2021·Membranes·Natalia VainrotMoris S Eisen
Jul 20, 2021·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Dmitri V Alexandrov, Andrey Yu Zubarev
Jul 20, 2021·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Margarita A Nikishina, Dmitri V Alexandrov
Jul 14, 2007·Environmental Science & Technology·Je-Hun JangWilliam D Burgos
Apr 2, 2020··Margarita A. NikishinaDmitri V. Alexandrov

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