Details
| Original language | English |
|---|---|
| Article number | 970 |
| Pages (from-to) | 970 |
| Number of pages | 1 |
| Journal | Nanomaterials |
| Volume | 8 |
| Issue number | 12 |
| Publication status | Published - 2018 |
| Externally published | Yes |
Abstract
In order to understand the properties involved in the heating performance of magnetic nanoparticles during hyperthermia treatments, a systematic study of different γ-Fe 2O 3 and Fe 3O 4 nanoparticles has been done. High-frequency hysteresis loops at 50 kHz carried out on particles with sizes ranging from 6 to 350 nm show susceptibility χ increases from 9 to 40 for large particles and it is almost field independent for the smaller ones. This suggests that the applied field induces chain ordering in large particles but not in the smaller ones due to the competition between thermal and dipolar energy. The specific absorption rate (SAR) calculated from hysteresis losses at 60 mT and 50 kHz ranges from 30 to 360 W/g Fe, depending on particle size, and the highest values correspond to particles ordered in chains. This enhanced heating efficiency is not a consequence of the intrinsic properties like saturation magnetization or anisotropy field but to the spatial arrangement of the particles.
Keywords
- Hyperthermia, Iron oxide, Magnetic nanoparticles, Specific absorption rate
ASJC Scopus subject areas
- Chemical Engineering(all)
- General Chemical Engineering
- Materials Science(all)
- General Materials Science
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Nanomaterials, Vol. 8, No. 12, 970, 2018, p. 970.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - High frequency hysteresis losses on $-Fe2O3 and Fe3O4: Susceptibility as a magnetic stamp for chain formation
T2 - Susceptibility as a magnetic stamp for chain formation
AU - Morales, Irene
AU - Costo, Rocio
AU - Mille, Nicolas
AU - Da Silva, Gustavo B
AU - Carrey, Julian
AU - Hernando, Antonio
AU - De la Presa, Patricia
N1 - Publisher Copyright: © 2018 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2018
Y1 - 2018
N2 - In order to understand the properties involved in the heating performance of magnetic nanoparticles during hyperthermia treatments, a systematic study of different γ-Fe 2O 3 and Fe 3O 4 nanoparticles has been done. High-frequency hysteresis loops at 50 kHz carried out on particles with sizes ranging from 6 to 350 nm show susceptibility χ increases from 9 to 40 for large particles and it is almost field independent for the smaller ones. This suggests that the applied field induces chain ordering in large particles but not in the smaller ones due to the competition between thermal and dipolar energy. The specific absorption rate (SAR) calculated from hysteresis losses at 60 mT and 50 kHz ranges from 30 to 360 W/g Fe, depending on particle size, and the highest values correspond to particles ordered in chains. This enhanced heating efficiency is not a consequence of the intrinsic properties like saturation magnetization or anisotropy field but to the spatial arrangement of the particles.
AB - In order to understand the properties involved in the heating performance of magnetic nanoparticles during hyperthermia treatments, a systematic study of different γ-Fe 2O 3 and Fe 3O 4 nanoparticles has been done. High-frequency hysteresis loops at 50 kHz carried out on particles with sizes ranging from 6 to 350 nm show susceptibility χ increases from 9 to 40 for large particles and it is almost field independent for the smaller ones. This suggests that the applied field induces chain ordering in large particles but not in the smaller ones due to the competition between thermal and dipolar energy. The specific absorption rate (SAR) calculated from hysteresis losses at 60 mT and 50 kHz ranges from 30 to 360 W/g Fe, depending on particle size, and the highest values correspond to particles ordered in chains. This enhanced heating efficiency is not a consequence of the intrinsic properties like saturation magnetization or anisotropy field but to the spatial arrangement of the particles.
KW - Hyperthermia
KW - Iron oxide
KW - Magnetic nanoparticles
KW - Specific absorption rate
UR - http://www.scopus.com/inward/record.url?scp=85057307827&partnerID=8YFLogxK
U2 - 10.3390/nano8120970
DO - 10.3390/nano8120970
M3 - Article
VL - 8
SP - 970
JO - Nanomaterials
JF - Nanomaterials
SN - 2079-4991
IS - 12
M1 - 970
ER -