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Construction of orthogonal synchronized bi-directional field to enhance heating efficiency of magnetic nanoparticles
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View: Figures


Image of FIG. 1.
FIG. 1.

The position and the definition of θ and φ for each MDM. Inside the nanoparticle, it is divided into 7 shells, in which contain different MDM in number. The shell in the centre is termed as S(1) and the outer shell is S(7). Other shells are termed as S(2)–S(6) sequentially.

Image of FIG. 2.
FIG. 2.

The diagram of OSB magnetic field system. FT and DI are denoted as ferrite transformer and integrated circuit for driving MOSFET, respectively. M1 – M4 are denoted as MOSFET. A – D are signals for gate of M1–M4. Coils 1 and 2 are Helmholtz ones and modeled by a parallel RLC circuit. PS1 and PS2 are represented as dc power suppliers and VC1 and VC2 variable capacitors. RL1 and RL2 are the resistances of wires.

Image of FIG. 3.
FIG. 3.

The diagram of the assembly of two Helmholtz coils.

Image of FIG. 4.
FIG. 4.

The accumulated reduced power dissipation of an immobile MNP under single, effective, cycler polarized (cycle), and OSB field by numerical simulation.

Image of FIG. 5.
FIG. 5.

(a) The duty cycle is set at 45% in “high” and 55% in “low”, as well as waveforms of M1 in two H-bridge circuits. (b) Output voltage of a H-bridge circuit and ac current in a coil.

Image of FIG. 6.
FIG. 6.

The waveforms of ac current in two coils. Small coil and large coil are denoted as Coil 1 and 2, respectively. θ is the angle between two coils. (a) θ > 0°, the resonance frequency is shifted to 208.8 kHz, (b) θ < 0°, the resonance frequency is shifted to 196.3 kHz and (c) θ = 0°, the resonance frequency is 201.9 kHz

Image of FIG. 7.
FIG. 7.

The magnetization curve of MNPs measured by SQUID at 298 K. The inset is the zoomed diagram at the center of magnetization curve.

Image of FIG. 8.
FIG. 8.

The heating abilities of MNPs as the function of strength of magnetic field. (a) the SAR values of D-MNPs and A-MNPs under single field. (b) A-MNPs under single, effective, and OSB fields. (c) the SAR ratio (E) value under effective and OSB fields for A-MNPs.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Construction of orthogonal synchronized bi-directional field to enhance heating efficiency of magnetic nanoparticles