scholarly journals Iron Oxide Nanorings and Nanotubes for Magnetic Hyperthermia: The Problem of Intraparticle Interactions

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1380
Author(s):  
Raja Das ◽  
Javier Alonso Masa ◽  
Vijaysankar Kalappattil ◽  
Zohreh Nemati ◽  
Irati Rodrigo ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Magnetic Nanostructures ◽  
Hysteresis Loops ◽  
Magnetic Hyperthermia ◽  
Magnetic Interactions ◽  
Effective Anisotropy ◽  
Heating Efficiency

Magnetic interactions can play an important role in the heating efficiency of magnetic nanoparticles. Although most of the time interparticle magnetic interactions are a dominant source, in specific cases such as multigranular nanostructures intraparticle interactions are also relevant and their effect is significant. In this work, we have prepared two different multigranular magnetic nanostructures of iron oxide, nanorings (NRs) and nanotubes (NTs), with a similar thickness but different lengths (55 nm for NRs and 470 nm for NTs). In this way, we find that the NTs present stronger intraparticle interactions than the NRs. Magnetometry and transverse susceptibility measurements show that the NTs possess a higher effective anisotropy and saturation magnetization. Despite this, the AC hysteresis loops obtained for the NRs (0–400 Oe, 300 kHz) are more squared, therefore giving rise to a higher heating efficiency (maximum specific absorption rate, SARmax = 110 W/g for the NRs and 80 W/g for the NTs at 400 Oe and 300 kHz). These results indicate that the weaker intraparticle interactions in the case of the NRs are in favor of magnetic hyperthermia in comparison with the NTs.

scholarly journals Hyperthermia Efficiency of Magnetic Nanoparticles in Dense Aggregates of Cerium Oxide/Iron Oxide Nanoparticles

2018 ◽  
Vol 8 (8) ◽  
pp. 1241 ◽  
Author(s):  
Cindy Yadel ◽  
Aude Michel ◽  
Sandra Casale ◽  
Jerome Fresnais
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Iron Oxide Nanoparticles ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Oxide Nanoparticles ◽  
Strong Impact ◽  
Heating Efficiency ◽  
Nanoparticles Dispersion

Iron oxide nanoparticles are intended to be used in bio-applications for drug delivery associated with hyperthermia. However, their interactions with complex media often induces aggregation, and thus a detrimental decrease of their heating efficiency. We have investigated the role of iron oxide nanoparticles dispersion into dense aggregates composed with magnetic/non-magnetic nanoparticles and showed that, when iron oxide nanoparticles were well-distributed into the aggregates, the specific absorption rate reached 79% of the value measured for the well-dispersed case. This study should have a strong impact on the applications of magnetic nanoparticles into nanostructured materials for therapy or catalysis applications.

scholarly journals Facile green synthesis of nanomagnets for modulating magnetohyperthermia: tailoring size, shape and phase

RSC Advances ◽  
2017 ◽  
Vol 7 (75) ◽  
pp. 47669-47680 ◽  
Author(s):  
M. P. Silva ◽  
A. L. Drummond ◽  
V. R. R. Aquino ◽  
L. P. Silva ◽  
R. B. Azevedo ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Green Synthesis ◽  
Magnetic Hyperthermia ◽  
Heating Efficiency ◽  
Iron Oxide Magnetic Nanoparticles

Isometric and anisometric iron oxide magnetic nanoparticles, synthesized via an eco-friendly route, present modulated heating efficiency for magnetic hyperthermia applications.

Fe2O3 nanoparticles for magnetic hyperthermia applications

2015 ◽  
Vol 1779 ◽  
pp. 7-13 ◽  
Author(s):  
O M Lemine ◽  
Karim Omri ◽  
L El Mir ◽  
V Velasco ◽  
Patricia Crespo ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Magnetic Hyperthermia ◽  
Fe2o3 Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heating Efficiency ◽  
Hall Method

ABSTRACTSynthesis, structural, magnetic properties and heating efficiency of γ-Fe2O3 nanoparticles have been investigated. X-ray diffraction (XRD) and Mössbauer spectroscopy show that the obtained nanoparticles are mainly composed of maghemite phase (γ-Fe2O3). Williamson-Hall method shows that the crystallite is around 14nm.The specific absorption rate (SAR) under an alternating magnetic field is investigated as a function of frequency. A highest SAR value of 12W/g for frequency 523 kHz was obtained.

scholarly journals Role of zinc substitution in magnetic hyperthermia properties of magnetite nanoparticles: interplay between intrinsic properties and dipolar interactions

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yaser Hadadian ◽  
Ana Paula Ramos ◽  
Theo Z. Pavan
Keyword(s):  
Magnetic Nanoparticles ◽  
Magnetite Nanoparticles ◽  
Linear Response Theory ◽  
Magnetic Hyperthermia ◽  
Superior Performance ◽  
Dipolar Interactions ◽  
Intrinsic Properties ◽  
Specific Loss ◽  
Heating Efficiency ◽  
Specific Loss Power

AbstractOptimizing the intrinsic properties of magnetic nanoparticles for magnetic hyperthermia is of considerable concern. In addition, the heating efficiency of the nanoparticles can be substantially influenced by dipolar interactions. Since adequate control of the intrinsic properties of magnetic nanoparticles is not straightforward, experimentally studying the complex interplay between these properties and dipolar interactions affecting the specific loss power can be challenging. Substituting zinc in magnetite structure is considered as an elegant approach to tune its properties. Here, we present experimental and numerical simulation results of magnetic hyperthermia studies using a series of zinc-substituted magnetite nanoparticles (ZnxFe1-xFe2O4, x = 0.0, 0.1, 0.2, 0.3 and 0.4). All experiments were conducted in linear regime and the results were inferred based on the numerical simulations conducted in the framework of the linear response theory. The results showed that depending on the nanoparticles intrinsic properties, interparticle interactions can have different effects on the specific loss power. When dipolar interactions were strong enough to affect the heating efficiency, the parameter σ = KeffV/kBT (Keff is the effective anisotropy and V the volume of the particles) determined the type of the effect. Finally, the sample x = 0.1 showed a superior performance with a relatively high intrinsic loss power 5.4 nHm2kg−1.

Effect of Bi Ions on the Hyperthermia Properties of Hyaluronic Acid-Coated La1−xSrxMnO3 Nanoparticles

NANO ◽  
2020 ◽  
Vol 15 (01) ◽  
pp. 2050015
Author(s):  
Lihan zheng ◽  
Yuanwei Chen ◽  
Ying Wang ◽  
Peng Wang ◽  
Tao Wang
Keyword(s):  
Hyaluronic Acid ◽  
Magnetic Nanoparticles ◽  
Curie Temperature ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Heating Temperature ◽  
Particle Diameter ◽  
High Energy ◽  
Average Particle ◽  
Specific Absorption

Self-regulating temperature hyperthermia based on magnetic fluid with low Curie temperature is a moderately effective method for cancer treatment. The improvement of the properties of magnetic fluids is the key for application of this method. In this paper, Bi-doped LSMO magnetic nanoparticles were synthesized using a simple sol–gel method and coated by hyaluronic acid through high energy ball milling for their possible application in self-regulating temperature hyperthermia. The crystal structure, morphology, basic magnetic properties and heating properties of these nanoparticles in a high frequency magnetic field were investigated. It was found that the hyaluronic acid-coated La[Formula: see text]Sr[Formula: see text]Bi[Formula: see text]MnO3 magnetic nanoparticles, with an average particle diameter of [Formula: see text]100[Formula: see text]nm and a Curie temperature of 48∘C, possess outstanding induction heating properties. The saturation heating temperature, specific absorption rate and effective specific absorption rate are 48∘C, 117[Formula: see text]W/g and 0.27[Formula: see text]W/g[Formula: see text]kHz[Formula: see text](kA/m2), respectively.

scholarly journals High Frequency Hysteresis Losses on γ-Fe2O3 and Fe3O4: Susceptibility as a Magnetic Stamp for Chain Formation

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 970 ◽  
Author(s):  
Irene Morales ◽  
Rocio Costo ◽  
Nicolas Mille ◽  
Gustavo da Silva ◽  
Julian Carrey ◽  
...  
Keyword(s):  
High Frequency ◽  
Specific Absorption Rate ◽  
Hysteresis Loops ◽  
Anisotropy Field ◽  
Spatial Arrangement ◽  
Hysteresis Losses ◽  
Heating Efficiency ◽  
Field Independent ◽  
Large Particles ◽  
Chain Ordering

In order to understand the properties involved in the heating performance of magnetic nanoparticles during hyperthermia treatments, a systematic study of different γ-Fe2O3 and Fe3O4 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/gFe, 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.

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