Influence of temperature and synthesis time on shape and size distribution of Fe3O4 nanoparticles obtained by ageing method

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2016-11, Vol.509, p.229-234
• Main Authors: Muradova, A.G., Zaytseva, M.P., Sharapaev, A.I., Yurtov, E.V.
• Format: Article
• Language: English
• Subjects: Ageing temperature; Ageing time; Deposition temperature; Iron oxide; Nanoparticles; Oxidant addition
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2016.08.080

[Display omitted] •The effect of ageing and deposition temperatures, oxidant adding and ageing time was defined.•Growth in average particle size took place only till 24h.•The optimal temperature conditions for obtaining Fe3O4 nanoparticles were found.•A mechanism of magnetite nanoparticles crystallization was suggested. Fe3O4 nanoparticles have been obtained by ageing method under controlling such conditions as follows: temperature, oxidation time, ageing time. Fe3O4 nanopowders have been examined by a transmission electron microscopy (TEM) and by X-ray diffractometry (XRD). XRD results showed that under time of the oxidant addition up to 30min only a crystalline phase of magnetite had been formed and also under such condition but time of the oxidant addition more then 30min an γ-FeOOH phase had been revealed. It has been established that size of Fe3O4 nanoparticles increased in the range of 42nm to 81nm with the increasing time of the ageing process. In order to obtain Fe3O4 nanoparticles with a narrow range of size distribution, optimal parameters have been determined. Nanoparticles with the standard deviation equal to 10nm have been obtained with an ambient temperature during the deposition process (deposition temperature) of 10°С and with an ambient temperature during the ageing process (ageing temperature) of 40°С.