Abstract
A novel method for preparing fine magnetite nanoparticles without using any additives and organic solvents has been developed. In this method, a sequential precipitates formation method, ferrous and ferric hydroxides are not coprecipitated but sequentially formed in an alkaline solution, and then the resulting suspension is subjected to a hydrothermal treatment. The obtained magnetite nanoparticles were characterised through scanning electron microscopy observation and X-ray diffraction analysis, and the particle size and magnetic properties were measured with a dynamic light scattering particle size analyser and a superconducting quantum interference device magnetometer, respectively. In order to prepare fine magnetite nanoparticles with a uniform size, both the formation sequence of ferrous and ferric hydroxide precipitates and the supersaturation of ferric hydroxide in the solution were essential. The ferromagnetic magnetite nanoparticles with a median size 8.5 nm were relatively easily obtained in the formation process in which a ferric sulphate solution was rapidly poured into a suspension of ferrous hydroxide particles prepared beforehand using ferric chloride and sodium hydroxide, whereas the median size of magnetite nanoparticles prepared via conventional coprecipitation route was 38.6 nm.
| Original language | English |
|---|---|
| Pages (from-to) | 355-365 |
| Number of pages | 11 |
| Journal | Journal of Experimental Nanoscience |
| Volume | 7 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Jan 1 2012 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Bioengineering
- Biomedical Engineering
- Materials Science(all)
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Hydrothermal synthesis of magnetite nanoparticles via sequential formation of iron hydroxide precipitates. / Iwasaki, Tomohiro; Mizutani, Naoya; Watano, Satoru; Yanagida, Takeshi; Kawai, Tomoji.
In: Journal of Experimental Nanoscience, Vol. 7, No. 4, 01.01.2012, p. 355-365.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Hydrothermal synthesis of magnetite nanoparticles via sequential formation of iron hydroxide precipitates
AU - Iwasaki, Tomohiro
AU - Mizutani, Naoya
AU - Watano, Satoru
AU - Yanagida, Takeshi
AU - Kawai, Tomoji
PY - 2012/1/1
Y1 - 2012/1/1
N2 - A novel method for preparing fine magnetite nanoparticles without using any additives and organic solvents has been developed. In this method, a sequential precipitates formation method, ferrous and ferric hydroxides are not coprecipitated but sequentially formed in an alkaline solution, and then the resulting suspension is subjected to a hydrothermal treatment. The obtained magnetite nanoparticles were characterised through scanning electron microscopy observation and X-ray diffraction analysis, and the particle size and magnetic properties were measured with a dynamic light scattering particle size analyser and a superconducting quantum interference device magnetometer, respectively. In order to prepare fine magnetite nanoparticles with a uniform size, both the formation sequence of ferrous and ferric hydroxide precipitates and the supersaturation of ferric hydroxide in the solution were essential. The ferromagnetic magnetite nanoparticles with a median size 8.5 nm were relatively easily obtained in the formation process in which a ferric sulphate solution was rapidly poured into a suspension of ferrous hydroxide particles prepared beforehand using ferric chloride and sodium hydroxide, whereas the median size of magnetite nanoparticles prepared via conventional coprecipitation route was 38.6 nm.
AB - A novel method for preparing fine magnetite nanoparticles without using any additives and organic solvents has been developed. In this method, a sequential precipitates formation method, ferrous and ferric hydroxides are not coprecipitated but sequentially formed in an alkaline solution, and then the resulting suspension is subjected to a hydrothermal treatment. The obtained magnetite nanoparticles were characterised through scanning electron microscopy observation and X-ray diffraction analysis, and the particle size and magnetic properties were measured with a dynamic light scattering particle size analyser and a superconducting quantum interference device magnetometer, respectively. In order to prepare fine magnetite nanoparticles with a uniform size, both the formation sequence of ferrous and ferric hydroxide precipitates and the supersaturation of ferric hydroxide in the solution were essential. The ferromagnetic magnetite nanoparticles with a median size 8.5 nm were relatively easily obtained in the formation process in which a ferric sulphate solution was rapidly poured into a suspension of ferrous hydroxide particles prepared beforehand using ferric chloride and sodium hydroxide, whereas the median size of magnetite nanoparticles prepared via conventional coprecipitation route was 38.6 nm.
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U2 - 10.1080/17458080.2010.515250
DO - 10.1080/17458080.2010.515250
M3 - Article
VL - 7
SP - 355
EP - 365
JO - Journal of Experimental Nanoscience
JF - Journal of Experimental Nanoscience
SN - 1745-8080
IS - 4
ER -