Preparation of γ-Fe2O3Ni2O3FeCl3(FeCl2) Composite Nanoparticles by Hydrothermal Process Useful for Ferrofluids
Joint Authors
Li, Jian
Miao, Hua
Zhang, Qingmei
Fu, Jun
Source
Issue
Vol. 2011, Issue 2011 (31 Dec. 2011), pp.1-5, 5 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2011-06-28
Country of Publication
Egypt
No. of Pages
5
Main Subjects
Engineering Sciences and Information Technology
Abstract EN
Using a hydrothermal process in FeCl2 solution, γ-Fe2O3/Ni2O3/FeCl3(FeCl2) composite nanoparticles were obtained from the FeOOH/Ni(OH)2 precursor prepared by coprecipitation.
The precursor and the as-prepared nanoparticles were investigated by vibrating sample magnetometer (VSM), X-ray diffraction (XRD), energy disperse X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM).
The experimental results showed that the paramagnetic amorphous precursor, in which Ni(OH)2 is formed outside FeOOH, is transformed to ferrimagnetic γ-Fe2O3/Ni2O3 composite when it is processed in FeCl2 solution (0.25, 0.50, 1.00 M) in an autoclave at 100°C for 1 hr.
In addition, the dismutation reaction of FeCl2 produces FeCl3 and Fe.
Some FeCl3 and little FeCl2 can be absorbed to form γ-Fe2O3/Ni2O3/FeCl3(FeCl2) composite nanoparticles in which Ni2O3 forms outside the γ-Fe2O3 core and the outermost layer is FeCl3 (FeCl2).
The content of FeCl3 (FeCl2) in the particles increased, and the magnetization of the particles decreased with the concentration of FeCl2 solution increasing in the hydrothermal process.
The FeCl3 (FeCl2) surface is chemically passive and nonmagnetic (paramagnetic).
Accordingly, the composite nanoparticles are chemically stable, and their aggregation is prevented.
The specific saturation magnetization of such composite nanoparticles can get to 57.4–62.2 emu/g and could be very suitable for synthesizing ferrofluids.
American Psychological Association (APA)
Zhang, Qingmei& Li, Jian& Miao, Hua& Fu, Jun. 2011. Preparation of γ-Fe2O3Ni2O3FeCl3(FeCl2) Composite Nanoparticles by Hydrothermal Process Useful for Ferrofluids. Smart Materials Research،Vol. 2011, no. 2011, pp.1-5.
https://search.emarefa.net/detail/BIM-464981
Modern Language Association (MLA)
Zhang, Qingmei…[et al.]. Preparation of γ-Fe2O3Ni2O3FeCl3(FeCl2) Composite Nanoparticles by Hydrothermal Process Useful for Ferrofluids. Smart Materials Research No. 2011 (2011), pp.1-5.
https://search.emarefa.net/detail/BIM-464981
American Medical Association (AMA)
Zhang, Qingmei& Li, Jian& Miao, Hua& Fu, Jun. Preparation of γ-Fe2O3Ni2O3FeCl3(FeCl2) Composite Nanoparticles by Hydrothermal Process Useful for Ferrofluids. Smart Materials Research. 2011. Vol. 2011, no. 2011, pp.1-5.
https://search.emarefa.net/detail/BIM-464981
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-464981