Abstract
In general, a rapid quenching is required to obtain an amorphous metal. It is known that an intensive ultrasonication generates a very high temperature within cavitation bubbles in a very short moment, which enables a rapid quenching process in a liquid phase synthesis. In this study, the sonochemically-derived “amorphous iron” from Fe(CO)5 was carefully examined by XRD, TEM, TG-DTA. The product was found to be an amorphous containing a certain amount (∼15%) of volatile component that can be removed by heating in a nitrogen flow. After annealed in the inert atmosphere at 600 °C, cooled down to room temperature, and then exposed in air (oxygen), the sample showed a strong exotherm accompanied by a weight gain. This is due to oxidation of fine metallic iron. Experimental operations of such a reactive material were examined.
| Original language | English |
|---|---|
| Pages (from-to) | 563-568 |
| Number of pages | 6 |
| Journal | Ultrasonics Sonochemistry |
| Volume | 35 |
| DOIs | |
| Publication status | Published - Mar 1 2017 |
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All Science Journal Classification (ASJC) codes
- Chemical Engineering (miscellaneous)
- Environmental Chemistry
- Radiology Nuclear Medicine and imaging
- Acoustics and Ultrasonics
- Organic Chemistry
- Inorganic Chemistry
Cite this
Crystallization behavior of iron-based amorphous nanoparticles prepared sonochemically. / Enomoto, Naoya; Hirata, Shingo; Inada, Miki; Hayashi, Katsuro.
In: Ultrasonics Sonochemistry, Vol. 35, 01.03.2017, p. 563-568.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Crystallization behavior of iron-based amorphous nanoparticles prepared sonochemically
AU - Enomoto, Naoya
AU - Hirata, Shingo
AU - Inada, Miki
AU - Hayashi, Katsuro
PY - 2017/3/1
Y1 - 2017/3/1
N2 - In general, a rapid quenching is required to obtain an amorphous metal. It is known that an intensive ultrasonication generates a very high temperature within cavitation bubbles in a very short moment, which enables a rapid quenching process in a liquid phase synthesis. In this study, the sonochemically-derived “amorphous iron” from Fe(CO)5 was carefully examined by XRD, TEM, TG-DTA. The product was found to be an amorphous containing a certain amount (∼15%) of volatile component that can be removed by heating in a nitrogen flow. After annealed in the inert atmosphere at 600 °C, cooled down to room temperature, and then exposed in air (oxygen), the sample showed a strong exotherm accompanied by a weight gain. This is due to oxidation of fine metallic iron. Experimental operations of such a reactive material were examined.
AB - In general, a rapid quenching is required to obtain an amorphous metal. It is known that an intensive ultrasonication generates a very high temperature within cavitation bubbles in a very short moment, which enables a rapid quenching process in a liquid phase synthesis. In this study, the sonochemically-derived “amorphous iron” from Fe(CO)5 was carefully examined by XRD, TEM, TG-DTA. The product was found to be an amorphous containing a certain amount (∼15%) of volatile component that can be removed by heating in a nitrogen flow. After annealed in the inert atmosphere at 600 °C, cooled down to room temperature, and then exposed in air (oxygen), the sample showed a strong exotherm accompanied by a weight gain. This is due to oxidation of fine metallic iron. Experimental operations of such a reactive material were examined.
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UR - http://www.scopus.com/inward/citedby.url?scp=84966552180&partnerID=8YFLogxK
U2 - 10.1016/j.ultsonch.2016.04.033
DO - 10.1016/j.ultsonch.2016.04.033
M3 - Article
C2 - 27184926
AN - SCOPUS:84966552180
VL - 35
SP - 563
EP - 568
JO - Ultrasonics Sonochemistry
JF - Ultrasonics Sonochemistry
SN - 1350-4177
ER -