scholarly journals Two Dimensions Simulation of a Magnetotactic Bacteria Cell Exposed to an Electromagnetic Field at 3 GHz

2021 ◽  
Vol 27 (3) ◽  
pp. 48-54
Author(s):  
Delia Luca ◽  
Simona Miclăuş

Abstract The effect of the presence of magnetite nanoparticles inside biological objects when they are exposed to microwaves has not yet been investigated completely. Microwaves magnetic hyperthermia is a field under development, and the use of biogenic magnetite is a relatively new vista. In this regard, the present approach presents a first step in a modeling-simulation process focused on the computation of the absorbed power distribution in bacteria cells containing native magnetite nanoparticles in the form of chains (magnetosomes). The presented simulations’ results refer to the simplest case of two-dimensional computation, which doesn’t take into consideration the geometric and magnetic anisotropy characteristics of the real magnetosomes.

2009 ◽  
Vol 292 (2) ◽  
pp. 250-253 ◽  
Author(s):  
Carolina N. Keim ◽  
Ulysses Lins ◽  
Marcos Farina

2020 ◽  
Vol 2 (3) ◽  
pp. 1115-1121
Author(s):  
Philipp Bender ◽  
Lourdes Marcano ◽  
Iñaki Orue ◽  
Diego Alba Venero ◽  
Dirk Honecker ◽  
...  

Magnetospirillum gryphiswaldense biosynthesize high quality magnetite nanoparticles, called magnetosomes, and arrange them into a chain that behaves like a magnetic compass.


2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yaser Hadadian ◽  
Ana Paula Ramos ◽  
Theo Z. Pavan

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.


2011 ◽  
Vol 13 (8) ◽  
pp. 3345-3352 ◽  
Author(s):  
J. D. Wei ◽  
I. Knittel ◽  
C. Lang ◽  
D. Schüler ◽  
U. Hartmann

Sign in / Sign up

Export Citation Format

Share Document