Abstract
Magnetite nanoparticles were synthesized by oxidizing a Fe(OH) 2 precipitate in various ultrasonic (US) fields including traveling wave (TW; 20 kHz) driven by a horn-type homogenizer and standing waves (SW; 45,100, 200 kHz) driven by a cleaner-type sonicator. Compared to a process with mechanical stirring (MS), each of US treatment completed the magnetite formation in much shorter time. The size of the nanoparticles decreased with the decreasing initial [Fe 2+ ] concentration. Noticeably at [Fe 2+ ] = 0.001 mol/L, no more particles but brown amorphous sols were formed in either MS or TW process. To the contrary, black magnetite nanoparticles were formed in the SW process as usual as higher concentration. The SW ultrasonication enabled to gather cavitation bubbles in its nodes, and then it is inferred that high supersaturation enough to form nanoparticles were achieved locally in the nodes of the SW field.
| Original language | English |
|---|---|
| Pages (from-to) | 194-198 |
| Number of pages | 5 |
| Journal | Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy |
| Volume | 56 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Apr 1 2009 |
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All Science Journal Classification (ASJC) codes
- Mechanical Engineering
- Industrial and Manufacturing Engineering
- Metals and Alloys
- Materials Chemistry
Cite this
Synthesis of magnetite nanoparticles under standing ultrasonication. / Enomoto, Naoya; Yamada, Kosuke; Dang, Feng; Inada, Miki; Hojo, Junichi.
In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, Vol. 56, No. 4, 01.04.2009, p. 194-198.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Synthesis of magnetite nanoparticles under standing ultrasonication
AU - Enomoto, Naoya
AU - Yamada, Kosuke
AU - Dang, Feng
AU - Inada, Miki
AU - Hojo, Junichi
PY - 2009/4/1
Y1 - 2009/4/1
N2 - Magnetite nanoparticles were synthesized by oxidizing a Fe(OH) 2 precipitate in various ultrasonic (US) fields including traveling wave (TW; 20 kHz) driven by a horn-type homogenizer and standing waves (SW; 45,100, 200 kHz) driven by a cleaner-type sonicator. Compared to a process with mechanical stirring (MS), each of US treatment completed the magnetite formation in much shorter time. The size of the nanoparticles decreased with the decreasing initial [Fe 2+ ] concentration. Noticeably at [Fe 2+ ] = 0.001 mol/L, no more particles but brown amorphous sols were formed in either MS or TW process. To the contrary, black magnetite nanoparticles were formed in the SW process as usual as higher concentration. The SW ultrasonication enabled to gather cavitation bubbles in its nodes, and then it is inferred that high supersaturation enough to form nanoparticles were achieved locally in the nodes of the SW field.
AB - Magnetite nanoparticles were synthesized by oxidizing a Fe(OH) 2 precipitate in various ultrasonic (US) fields including traveling wave (TW; 20 kHz) driven by a horn-type homogenizer and standing waves (SW; 45,100, 200 kHz) driven by a cleaner-type sonicator. Compared to a process with mechanical stirring (MS), each of US treatment completed the magnetite formation in much shorter time. The size of the nanoparticles decreased with the decreasing initial [Fe 2+ ] concentration. Noticeably at [Fe 2+ ] = 0.001 mol/L, no more particles but brown amorphous sols were formed in either MS or TW process. To the contrary, black magnetite nanoparticles were formed in the SW process as usual as higher concentration. The SW ultrasonication enabled to gather cavitation bubbles in its nodes, and then it is inferred that high supersaturation enough to form nanoparticles were achieved locally in the nodes of the SW field.
UR - http://www.scopus.com/inward/record.url?scp=67650627776&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=67650627776&partnerID=8YFLogxK
U2 - 10.2497/jjspm.56.194
DO - 10.2497/jjspm.56.194
M3 - Article
AN - SCOPUS:67650627776
VL - 56
SP - 194
EP - 198
JO - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
JF - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
SN - 0532-8799
IS - 4
ER -