Alternating current magnetic susceptibility and heat dissipation by Mn1−xZnxFe2O4 nanoparticles for hyperthermia treatment

2015 ◽  
Vol 117 (17) ◽  
pp. 17D157 ◽  
Author(s):  
T. Kondo ◽  
K. Mori ◽  
M. Hachisu ◽  
T. Yamazaki ◽  
D. Okamoto ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Heat Dissipation ◽  
Alternating Current ◽  
Hyperthermia Treatment

scholarly journals Enhanced Cancer Cell (HeLa) Killing Efficacy of Mixed Αlpha and Gamma Iron Oxide Superparamagnetic Nanoparticles under Combined AC (Alternating Current) Magnetic-Field and Photoexcitation

1970 ◽  
Vol 12 (4) ◽  
Author(s):  
Md. Shariful Islam, Yoshihumi Kusumoto, Md. Abdulla Al-Mamun And Yuji Horie
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
Hela Cells ◽  
Room Temperature ◽  
Heat Dissipation ◽  
Alternating Current ◽  
Superparamagnetic Nanoparticles ◽  
Gamma Iron ◽  
Ac Magnetic Field ◽  
Current Magnetic Field

We synthesized mixed α and γ-Fe2O3 nanoparticles and investigated their toxic effects against HeLa cells under induced AC (alternating current) magnetic-fields and photoexcited conditions at room temperature. The findings revealed that the cell-killing percentage was increased with increasing dose for all types of treatments. Finally, 99% cancer cells were destructed at 1.2 mL dose when exposed to combined AC magnetic-field and photoexcited conditions (T3) whereas 89 and 83 % of HeLa cells were killed under only AC magnetic-field induced (T1) or only photoexcited (T2) condition at the same dose.ABSTRAK: Campuran α dan zarah γ-Fe2O3 bersaiz nano disintesiskan dan kesan toksidnya terhadap sel HeLa dikaji dibawah aruhan medan magnet arus ulang-alik (alternating current (AC)) dan keadaan photoexcited (proses ransangan atom atau molekul suatu bahan dengan penyerapan tenaga sinaran) pada suhu bilik. Penemuan mendedahkan bahawa peratusan sel yang musnah bertambah dengan pertambahan dos untuk semua jenis rawatan. Akhirnya, 99% sel kanser dimusnahkan pada kadar dos 1.2mL setelah didedahkan terhadap kombinasi medan magnet AC dan keadaan photoexcited (T3) dimana 89% dan 83% sel HeLa dimusnahkan dengan hanya di bawah aruhan medan magnet AC (T1) atau hanya pada keadaan photoexcited (T2) pada kadar dos yang sama.KEY WORDS : Cancer, Hyperthermia, Iron oxide nanoparticles, Heat dissipation,    Cytotoxicity, HeLa cell.

scholarly journals Biomedical Applications of Biomaterials Functionalized with Magnetic Nanoparticles

2020 ◽  
Author(s):  
Matteo Bruno Lodi ◽  
Alessandro Fanti
Keyword(s):  
Magnetic Field ◽  
Drug Delivery ◽  
Magnetic Nanoparticles ◽  
Heat Dissipation ◽  
Hyperthermia Treatment ◽  
Prosthetic Implants ◽  
Magnetic Carriers ◽  
Magnetic Drug Delivery ◽  
Influence Parameter ◽  
Nonlinear Nature

The combination of magnetic nanoparticles and a biocompatible material leads to the manufacturing of a multifunctional and remotely controlled platform useful for diverse biomedical issues. If a static magnetic field is applied, a magnetic scaffold behaves like an attraction platform for magnetic carriers of growth factors, thus being a potential tool to enhance magnetic drug delivery in regenerative medicine. To translate in practice this potential application, a careful and critical description of the physics and the influence parameter is required. This chapter covers the mathematical modeling of the process and assesses the problem of establishing the influence of the drug delivery system on tissue regeneration. On the other hand, if a time-varying magnetic field is applied, the magnetic nanoparticles would dissipate heat, which can be exploited to perform local hyperthermia treatment on residual cancer cells in the bone tissue. To perform the treatment planning, it is necessary to account for the modeling of the intrinsic nonlinear nature of the heat dissipation dynamic in magnetic prosthetic implants. In this work, numeric experiments to investigate the physiopathological features of the biological system, linked to the properties of the nanocomposite magnetic material, to assess its effectiveness as therapeutic agents are presented.

Alternating current magnetic susceptibility of ferronematics: The case of high concentration of magnetic nanoparticles

2020 ◽  
Vol 500 ◽  
pp. 166331
Author(s):  
Katarína Zakutanská ◽  
Natália Tomašovičová ◽  
Nándor Éber ◽  
Tibor Tóth-Katona ◽  
Jozef Kováč ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Magnetic Nanoparticles ◽  
Alternating Current ◽  
High Concentration

Alternating current magnetic susceptibility measurements in La1−xSrxCoO3 (x⩽0.30) below 300 K

1997 ◽  
Vol 81 (8) ◽  
pp. 5753-5755 ◽  
Author(s):  
J. Mira ◽  
J. Rivas ◽  
R. D. Sánchez ◽  
M. A. Señarís-Rodríguez ◽  
D. Fiorani ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Alternating Current

scholarly journals High-temperature superconductivity in sulfur hydride evidenced by alternating-current magnetic susceptibility

2019 ◽  
Vol 6 (4) ◽  
pp. 713-718 ◽  
Author(s):  
Xiaoli Huang ◽  
Xin Wang ◽  
Defang Duan ◽  
Bertil Sundqvist ◽  
Xin Li ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Magnetic Susceptibility ◽  
High Temperature ◽  
High Temperature Superconductivity ◽  
Theoretical Calculations ◽  
Meissner Effect ◽  
Alternating Current ◽  
Superconducting Phase ◽  
Electron Phonon Interaction

ABSTRACT The search for high-temperature superconductivity is one of the research frontiers in physics. In the sulfur hydride system, an extremely high Tc (∼200 K) has been recently developed at pressure. However, the Meissner effect measurement above megabar pressures is still a great challenge. Here, we report the superconductivity identification of sulfur hydride at pressure, employing an in situ alternating-current magnetic susceptibility technique. We determine the superconducting phase diagram, finding that superconductivity suddenly appears at 117 GPa and Tc reaches 183 K at 149 GPa before decreasing monotonically with increasing pressure. By means of theoretical calculations, we elucidate the variation of Tc in the low-pressure region in terms of the changing stoichiometry of sulfur hydride and the further decrease in Tc owing to a drop in the electron–phonon interaction parameter λ. This work provides a new insight into clarifying superconducting phenomena and anchoring the superconducting phase diagram in the hydrides.

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