Dipolar interactions among magnetite nanoparticles for magnetic hyperthermia: a rate-equation approach

Nanoscale ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 4103-4121
Author(s):  
Gabriele Barrera ◽  
Paolo Allia ◽  
Paola Tiberto
Keyword(s):  
Magnetic Nanoparticles ◽  
Rate Equation ◽  
Magnetite Nanoparticles ◽  
Magnetic Hyperthermia ◽  
Heating Power ◽  
Dynamical Response ◽  
Equation Approach ◽  
Dipolar Interactions ◽  
Rate Equation Approach

Dipolar interactions strongly modify effective heating power and the dynamical response regime of magnetic nanoparticles.

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.

scholarly journals Rate-equation approach to atomic-laser light statistics

2002 ◽  
Vol 66 (5) ◽  
Author(s):  
Laurent Chusseau ◽  
Jacques Arnaud ◽  
Fabrice Philippe
Keyword(s):  
Rate Equation ◽  
Laser Light ◽  
Equation Approach ◽  
Rate Equation Approach
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