Crystallization of Magnetic Iron Oxide Nanoparticles during Chemical Synthesis from Iron Salt Solutions with Exposure to Ultrasound

A. M. Nikolaev; Николаев А. М.; A. S. Kovalenko; Коваленко А. С.; K. V. Frolov; Фролов К. В.; G. P. Kopitsa; Копица Г. П.; A. E. Baranchikov; Баранчиков А. Е.; O. A. Shilova; Шилова О. А.

doi:10.31857/S0044453723070191

Crystallization of Magnetic Iron Oxide Nanoparticles during Chemical Synthesis from Iron Salt Solutions with Exposure to Ultrasound

Authors: Nikolaev A.M.¹^,2, Kovalenko A.S.¹, Frolov K.V.³, Kopitsa G.P.¹^,4, Baranchikov A.E.⁵, Shilova O.A.¹^,6
Affiliations:
1. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences
2. St. Petersburg State University
3. Shubnikov Institute of Crystallography, Russian Academy of Sciences
4. National Research Center Kurchatov Institute
5. Kurnakov Institute of General and Inorganic Chemistry
6. St. Petersburg State Electrotechnical University
Issue: Vol 97, No 7 (2023)
Pages: 1050-1055
Section: ФИЗИЧЕСКАЯ ХИМИЯ НАНОКЛАСТЕРОВ, СУПРАМОЛЕКУЛЯРНЫХ СТРУКТУР И НАНОМАТЕРИАЛОВ
Submitted: 15.10.2023
Published: 01.07.2023
URL: https://ogarev-online.ru/0044-4537/article/view/136641
DOI: https://doi.org/10.31857/S0044453723070191
EDN: https://elibrary.ru/SLPMSS
ID: 136641

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Abstract

Iron oxide nanopowders are synthesized via chemical precipitation. It is shown that synthesis produces an iron oxide phase with a magnetite structure (either a magnetite–maghemite solid solution or a mixture of this solid solution and goethite). The sizes of the CSR and particles for the main phase are ~10–20 nm. The synthesized iron oxide powders have developed surfaces, specific surface area SBET ≈ 92 and 117 m2/g, and identical fairly large specific pore volumes (VP/P0→0.99/0→0.99 = 0.35 cm3/g). It is shown that additional in situ ultrasonic treatment of the magnetic iron oxide nanoparticles in the mother liquor results in abrupt oxidation of iron(II) ions and creates a nonmagnetic impurity phase of goethite.

Keywords

chemical coprecipitation, magnetite, maghemite

References

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