scholarly journals Concurrent quantification of magnetic nanoparticles temperature and relaxation time

2019 ◽  
Vol 46 (9) ◽  
pp. 4070-4076 ◽  
Author(s):  
Yipeng Shi ◽  
John B. Weaver
Keyword(s):  
Relaxation Time ◽  
Magnetic Nanoparticles

Synthesis and Studying Induction Heating of Mn1-xZnxFe2O4 (x=0-0.5) Magnetic Nanoparticles for Hyperthermia Treatments

2021 ◽  
Vol 882 ◽  
pp. 200-218
Author(s):  
S. Mahmood Hussein ◽  
T.H. Mubarak ◽  
S.M. Ali Ridha ◽  
Jasim Al-Zanganawee
Keyword(s):  
Particle Size ◽  
Relaxation Time ◽  
Magnetic Nanoparticles ◽  
Smart Materials ◽  
Average Particle Size ◽  
Superparamagnetic Nanoparticles ◽  
Soft Magnetic Materials ◽  
Precipitation Method ◽  
Average Particle ◽  
Co Precipitation

The recent development of the using the magnetic nanoparticles for hyperthermia treatments emphasizes the needed of smart materials to become a safety for heat therapy. Self-regulate magnetic nanoparticles of MnZnFe2O4 may be proper for thermal treatments. Structure and magnetic properties of the synthesis Mn1-xZnx Fe2O4 with x=0- 0.5 by step 0.1were studied. Superparamagnetic nanoparticles of MnZnFe2O4 were prepared by co-precipitation method, followed that heat treatment in the autoclave reactor. XRD results showed that is difficult to prepare MnZnFe2O4 directly using the co-precipitation method. Preparation method yield nanoparticles with spherical shape and there is a slight change in the particle size distribution, also observed shrinkage occurs in the particle size after heat treatments, the average particle size was estimated about 20nm as confirmed by FESEM images. FTIR spectra of samples showed two distinct absorption peaks in the range ~ 617 – 426 (cm-1) related to stretching vibrations of the (Fe-O) in the tetrahedral and octahedral side respectively. Magnetic measurements were carried out using (VSM), M-H curves indicate typical soft magnetic materials and particles so small to be identical superparamagnetic nanoparticles. Heating ability of water based colloidal dispersions of samples were studied under magnetic field strength 6.5kA/m and the frequency 190 kHz, and the results showed when increasing Zn2+ to x=0.3 or more the samples not heated up. Depending on the heating curve susceptibility, effective relaxation time and Néel relaxation time , were determined.

Modulation of T2 Relaxation Time by Light-Induced, Reversible Aggregation of Magnetic Nanoparticles

2010 ◽  
Vol 132 (17) ◽  
pp. 5934-5935 ◽  
Author(s):  
Elizabeth A. Osborne ◽  
Benjamin R. Jarrett ◽  
Chuqiao Tu ◽  
Angelique Y. Louie
Keyword(s):  
Relaxation Time ◽  
Magnetic Nanoparticles ◽  
T2 Relaxation Time ◽  
T2 Relaxation ◽  
Reversible Aggregation

scholarly journals Assaying Biomarkers via Real-Time Measurements of the Effective Relaxation Time of Biofunctionalized Magnetic Nanoparticles Associated with Biotargets

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Shu-Hsien Liao ◽  
Jean-Hong Chen ◽  
Yu-Kai Su ◽  
Kuen-Lin Chen ◽  
Herng-Er Horng ◽  
...  
Keyword(s):  
Brownian Motion ◽  
Relaxation Time ◽  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Saturation Magnetization ◽  
Real Time ◽  
Logistic Function ◽  
Alpha Fetoprotein ◽  
Oxide Nanoparticles ◽  
Magnetic Clusters

An assay of biomarkers consisting of alpha-fetoprotein (AFP) is reported. Real-time measurements of the effective relaxation timeτeff, when the biofunctionalized magnetic nanoparticles (BMNs) were conjugating with biotargets, were made. The BMNs are anti-alpha-fetoprotein (antiAFP) coated onto dextran-coated iron oxide nanoparticles labeled as Fe3O4-antiAFP. It was found that the effective relaxation time,τeff, increases as the association of AFP and Fe3O4-antiAFP evolves. We attribute this to the enhanced Brownian motion of BMNs when magnetic clusters are present during the conjugation. We found that saturation magnetization,Ms, increases when the concentration of AFP increases. This is due to the fact that more magnetic clusters are associated in the reagent, and therefore theMsincreases when the concentration of AFP increases. The change of effective relaxation time and saturation magnetization shows a behavior of logistic function, which provides a foundation for assaying an unknown amount of biomolecules. Thus, we demonstrate sensitive platforms for detecting AFP by characterizingτeff. The detection platform is robust and easy to use and shows promise for further use in assaying a broad number of biomarkers.

Magnetic field orientation dependent dynamic susceptibility and Brownian relaxation time of magnetic nanoparticles

2019 ◽  
Vol 115 (13) ◽  
pp. 133102
Author(s):  
Jing Zhong ◽  
Niklas Lucht ◽  
Birgit Hankiewicz ◽  
Meinhard Schilling ◽  
Frank Ludwig
Keyword(s):  
Magnetic Field ◽  
Relaxation Time ◽  
Magnetic Nanoparticles ◽  
Dynamic Susceptibility ◽  
Field Orientation ◽  
Magnetic Field Orientation

scholarly journals Characterization of magnetic relaxation when biofunctionalized magnetic nano-particles are associated with biomarkers in the liquid state in biomedical applications

RSC Advances ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 4057-4062 ◽  
Author(s):  
Shu-Hsien Liao ◽  
Han-Sheng Huang ◽  
Jean-Hong Chen ◽  
Yu-Kai Su ◽  
Yuan-Fu Tong
Keyword(s):  
Relaxation Time ◽  
Magnetic Nanoparticles ◽  
Liquid State ◽  
Magnetic Relaxation ◽  
Biomedical Applications ◽  
Nano Particles ◽  
Time Dependent ◽  
Magnetic Nano Particles

This study determined the characteristics of the time-dependent effective relaxation time τeff and magnetization M when biofunctionalized magnetic nanoparticles (BMNPs) associated with biomarkers in a liquid immunoassay.

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