Heating ability of magnetic nanoparticles with cubic and combined anisotropy

Usov, N. A.; Nesmeyanov, M. S.; Gubanova, Elizaveta M; Эпштейн, Наталья Борисовна

doi:10.3762/bjnano.10.29

Cited by 37 publications

(61 citation statements)

References 34 publications

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“…As a result, the SAR value of the assembly significantly decreases [ 26 , 27 , 60 ] due to the influence of a strong magnetic dipole interaction between the nanoparticles of the cluster. Recent theoretical calculations show [ 54 , 55 ] that with an increase in the average density of a nanoparticle assembly in the range η = 0.01–0.35, the maximum SAR value of the assembly of nanoparticles with different types of magnetic anisotropy decreases by about 5–6 times, compared with the SAR of dilute assembly of the same nanoparticles. Thus, the strong magneto-dipole interaction between the nanoparticles, generally speaking, negatively affects the ability of the assembly to absorb the energy of AC magnetic field [ 1 , 26 , 27 , 54 , 55 ].…”

Section: Discussionmentioning

confidence: 99%

“…The thermal fields

acting on various nanoparticles of the chain are statistically independent, with the following statistical properties [ 49 ] of their components

where k B is the Boltzmann constant, δ α β is the Kroneker symbol, and δ ( t ) is the delta function. The numerical simulation procedure is described in details in [ 54 , 55 ].…”

Section: Model and Methodsmentioning

confidence: 99%

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Application of Magnetosomes in Magnetic Hyperthermia

Usov

Gubanova

2020

Nanomaterials

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Nanoparticles, specifically magnetosomes, synthesized in nature by magnetotactic bacteria, are very promising to be usedin magnetic hyperthermia in cancer treatment. In this work, using the solution of the stochastic Landau–Lifshitz equation, we calculate the specific absorption rate (SAR) in an alternating (AC) magnetic field of assemblies of magnetosome chains depending on the particle size D, the distance between particles in a chain a, and the angle of the applied magnetic field with respect to the chain axis. The dependence of SAR on the a/D ratio is shown to have a bell-shaped form with a pronounced maximum. For a dilute oriented chain assembly with optimally chosen a/Dratio,a strong magneto-dipole interaction between the chain particles leads to an almost rectangular hysteresis loop, and to large SARvaluesin the order of 400–450 W/g at moderate frequencies f= 300 kHz and small magnetic field amplitudes H0 = 50–100 Oe. The maximum SAR value only weakly depends on the diameter of the nanoparticles and the length of the chain. However, a significant decrease in SAR occurs in a dense chain assembly due to the strong magneto-dipole interaction of nanoparticles of different chains.

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Section: Discussionmentioning

confidence: 99%

“…The thermal fields

acting on various nanoparticles of the chain are statistically independent, with the following statistical properties [ 49 ] of their components

where k B is the Boltzmann constant, δ α β is the Kroneker symbol, and δ ( t ) is the delta function. The numerical simulation procedure is described in details in [ 54 , 55 ].…”

Section: Model and Methodsmentioning

confidence: 99%

Application of Magnetosomes in Magnetic Hyperthermia

Usov

Gubanova

2020

Nanomaterials

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“…The results presented here have the potential to be applied in several fields that use colloidal magnetic nanoparticle systems, in particular the biomedical field [ 36 – 41 ]. The theoretical and experimental investigation of nanoparticles with magnetic hyperthermia properties is essential for the development of alternative therapies for treating cancer in its various stages and types.…”

Section: Discussionmentioning

confidence: 99%

Influence of the magnetic nanoparticle coating on the magnetic relaxation time

Osaci¹,

Cacciola²

2020

Beilstein J. Nanotechnol.

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Colloidal systems consisting of monodomain superparamagnetic nanoparticles have been used in biomedical applications, such as the hyperthermia treatment for cancer. In this type of colloid, called a nanofluid, the nanoparticles tend to agglomeration. It has been shown experimentally that the nanoparticle coating plays an important role in the nanoparticle dispersion stability and biocompatibility. However, theoretical studies in this field are lacking. In addition, the ways in which the nanoparticle coating influences the magnetic properties of the nanoparticles are not yet understood. In order to fill in this gap, this study presents a numerical simulation model that elucidates how the nanoparticle coating affects the nanoparticle agglomeration tendency as well as the effective magnetic relaxation time of the system. To simulate the self-organization of the colloidal nanoparticles, a stochastic Langevin dynamics method was applied based on the effective Verlet-type algorithm. The Néel magnetic relaxation time was obtained via the Coffey method in an oblique magnetic field, adapted to the local magnetic field on a nanoparticle.

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“…While most experimental and theoretical studies on magnetocrystalline anisotropy have been conducted on bulk and with thin film materials [ 15 , 16 , 17 , 18 ], very few studies have been reported on magnetic nanoparticles. Although the effect of the uniaxial magnetic anisotropy of magnetic nanoparticles on the SLP has been studied theoretically [ 19 ], it is important to evaluate the magnetocrystalline anisotropy of magnetic nanoparticles according to experimentally evaluated characteristics.…”

Section: Introductionmentioning

confidence: 99%

Magnetization Characteristics of Oriented Single-Crystalline NiFe-Cu Nanocubes Precipitated in a Cu-Rich Matrix

et al. 2020

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In this study, we evaluated the magnetization properties of a magnetic alloy with single-crystalline cubic nanostructures, in order to clarify its magnetocrystalline anisotropy. Upon applying a specific annealing treatment to the CuNiFe base material, the precipitated magnetic particles grew into cubic granules, resulting in the formation of nanometric cubic single crystals of magnetic CuNiFe in a nonmagnetic Cu-rich matrix. The cubic nanostructures of CuNiFe were oriented along their crystallographic axis, in the <100> direction of the face-centered-cubic structure. We evaluated the static magnetization properties of the sample, which originated primarily from the CuNiFe nanocubes precipitated in the Cu-rich matrix, under an applied DC magnetic field. The magnetocrystalline anisotropy was readily observed in the magnetization curves. The <111> axis of the CuNiFe was observed to be the easy axis of magnetization. We also investigated the dynamic magnetization properties of the sample under an AC magnetic field. By subtracting the magnetic signal induced by the eddy current from the magnetization curves of the sample, we could obtain the intrinsic AC magnetization properties of the CuNiFe nanocubes.

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Heating ability of magnetic nanoparticles with cubic and combined anisotropy

Cited by 37 publications

References 34 publications

Application of Magnetosomes in Magnetic Hyperthermia

Application of Magnetosomes in Magnetic Hyperthermia

Influence of the magnetic nanoparticle coating on the magnetic relaxation time

Magnetization Characteristics of Oriented Single-Crystalline NiFe-Cu Nanocubes Precipitated in a Cu-Rich Matrix

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