Influence of the cluster formation in a magnetic particle suspension on heat production effect in an alternating magnetic field

Suzuki, Seiya; Satoh, Akira

doi:10.1007/s00396-019-04546-x

Cited by 11 publications

(3 citation statements)

References 10 publications

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“…In contrast, other studies attribute this effect to Brownian mobility restriction [17], [20]. Nevertheless, in [21] the decline in the effect of Brownian dynamics on NPs heating was studied; it was concluded that the magnetic moment of each constituent particle could sufficiently respond to the change in the magnetic field when the particle-field interaction is significantly more dominant, which leads to a larger area of the hysteresis loop, hence a better heat production performance. Therefore, a more considerable efficacy in producing heat could solve most of the above-described problems, either improving the nanoparticles' behavior, which is the line of research followed by most scientific community, or improving energy delivery from the exciting magnetic field, which is the main aim of this work.…”

Section: Introductionmentioning

confidence: 97%

Configurable High-Frequency Alternating Magnetic Field Generator for Nanomedical Magnetic Hyperthermia Applications

et al. 2021

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This article shows the use of a high-frequency Full-Bridge inverter to design an alternating magnetic field generator for experimental studies on anti-cancer treatment with magnetic nanoparticles. In magnetic hyperthermia, nanoparticles are used to raise the pathological cancerous cell's temperature high enough to induce their death by apoptosis, but not as high as to destroy them by thermal ablation of the whole tissue volume, consequently leaving healthy cells alive. Conventionally, sinusoidal alternative magnetic fields are used to heat the nanoparticles, which can be more easily produced than other waveforms. However, there are no theoretical nor experimental reasons to chose the sinusoidal waveform. This work aims to develop an improved power system to study the effect of different waveforms of the magnetic field on the heat production when exciting magnetic nanoparticles, aiming at demonstrating that other waveforms can be much more efficient in producing heat than conventional sinusoids. To prove our hypothesis, we designed an inverter able to generate four waveforms at high frequencies and a fifth sinusoidal signal derived by a resonant capacitor, in the range of 100 kHz to 1 MHz and up to 10 mT of peak intensity. Also, we used SiC devices to process high currents at high switching frequencies efficiently. Additionally, to enhance the system efficiency, Zero-Voltage Switching is used to reduce switching losses and minimize electromagnetic noise and interference. The experimental results obtained with non-sinusoidal waveforms have shown a remarkable performance improvement compared to classical sine wave excitation. The nanoparticles' heat dissipation depends on the applied alternating magnetic field's signal slope, signal frequency, and peak field intensity. We conclude that further work deserves to be done to find the optimum work conditions in function of the used particle and biological environment, to test if this type of magnetic field generator could overcome the conventional system's performance.

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Section: Introductionmentioning

confidence: 97%

Configurable High-Frequency Alternating Magnetic Field Generator for Nanomedical Magnetic Hyperthermia Applications

et al. 2021

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“…With the continuous development of society, the future development trend of rail transit will have the characteristics of energy saving, environmental protection, safety and comfort, fast, and convenience. In addition to technological innovations in existing rail transportation vehicles, rail transit in the twenty-rst century, it is also necessary to vigorously develop new rail transportation vehicles, and the maglev train was born [1]. At the same time, with the continuous development of superconducting materials, combining superconducting materials and magnetic levitation trains makes the maglev train faster, develops operational reliability, high safety, low loss and noise, and is comfortable and environmentally friendly [2].…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Electro-Superconducting System Based on the H Equation

Zhang

2022

Journal of Chemistry

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In order to reduce the levitation energy consumption and increase the levitation air gap, a simulation study of the electrochemistry superconducting magnetic levitation system based on the H equation is proposed. Through finite element simulation, the magnetic field distribution, current distribution, force, and other characteristics of the magnetic suspension system in the superconducting gravimeter are obtained; the relationship between the force of the superconducting ball in the magnetic field and the height of the suspension body and the current of the suspension coil is analyzed; and the penetration rate, the magnetic gradient, penetration depth, and maximum magnetic induction intensity of the superconducting spherical surface of the single-coil electrochemistry superconducting magnetic levitation system are obtained by simulation calculation. Simulation results show that, at 1 s, we start to use 0.2 s, 0.4 s, 0.6 s, and 0.8 s time, respectively, to pass current into the floating coil until it reaches 4.4 A. The magnetic gradient of the electrochemistry superconducting magnetic levitation system using a single coil is too large to meet the requirements of gravity measurement, the penetration depth is much smaller than the thickness of the superconducting sphere, and the maximum magnetic field on the surface of the superconducting sphere is much smaller than the critical magnetic field value of the superconducting material, and no loss will occur. The critical magnetic field value of the superconducting sphere is much smaller than that of the superconducting sphere. The critical magnetic field value of the material will not quench, which verifies that the H equation can simulate the superconducting magnetic levitation system well and has a high simulation accuracy and efficiency.

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“…To derive the solution for the macroscopic flow field, researchers employ molecular dynamics methods to simulate the movement of individual molecules within the fluid. − Li et al − found that an electric field induces the formation of hydrogen bonds with a lifespan of approximately 1 ps between polymer droplets, which enhances the polarity of the droplets and promotes their deformation and rupture. Song et al obtained the coalescence and rupture behavior of two NaCl solution droplets in an electric field through molecular dynamics, including droplet proximity, contact, and final merging.…”

Section: Introductionmentioning

confidence: 99%

Microscopic Mechanism for Gradient Diffusion of Salt-Containing Droplets Induced by Electromagnetic Synergy: A Molecular Dynamics Study

Guo,

Du,

Ling

et al. 2024

Langmuir

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The electromagnetic synergy has been proven to be highly effective in separating oil−water emulsions. However, the dynamic impact mechanism of electromagnetic fields on the internal structure of salt droplets remains unclear. In this study, the molecular dynamics (MD) simulation was used to investigate the molecular diffusion of salt ions and water molecules, as well as the dynamic behavior of droplets under the combined influence of electromagnetic fields. The results indicate that ions accumulate in the electromagnetic synergistic field, causing the deformation amplitude of droplets to be smaller than that in a single electric field. The magnetic field affects the energy of the system, when the magnetic field strength is between 1 and 5T, the nonbonded energy significantly increases nonlinearly; when the magnetic field strength is greater than 5T, the total energy of the system significantly changes. In addition, the viscosity of the medium is significantly lower when the intensity of the magnetic and electric fields is controlled within a specific range, providing a new way to regulate the fluidity of fluids.

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Influence of the cluster formation in a magnetic particle suspension on heat production effect in an alternating magnetic field

Cited by 11 publications

References 10 publications

Configurable High-Frequency Alternating Magnetic Field Generator for Nanomedical Magnetic Hyperthermia Applications

Configurable High-Frequency Alternating Magnetic Field Generator for Nanomedical Magnetic Hyperthermia Applications

Simulation of the Electro-Superconducting System Based on the H Equation

Microscopic Mechanism for Gradient Diffusion of Salt-Containing Droplets Induced by Electromagnetic Synergy: A Molecular Dynamics Study

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