Magnetic Thermometer: Thermal effect on the Agglomeration of Magnetic Nanoparticles by Magnetic field

We have investigated the agglomeration of magnetite nanoparticles in the aqueous solution under magnetic field by measuring temporal change of magnetic weight. The magnetic weight corresponds to the force due to the magnetization of magnetic materials. Superparamagnetic magnetite nanoparticles are s...

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Bibliographic Details
Published in:Journal of physics. Conference series 2018-03, Vol.987 (1), p.12036
Main Authors: Jin, Daeseong, Kim, Hackjin
Format: Article
Language:English
Subjects:
Agglomeration
Aqueous solutions
Boltzmann distribution
Energy distribution
Exponential functions
Magnetic fields
Magnetic materials
Magnetism
Magnetite
Nanoparticles
Physics
Temperature effects
Weight
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Summary:We have investigated the agglomeration of magnetite nanoparticles in the aqueous solution under magnetic field by measuring temporal change of magnetic weight. The magnetic weight corresponds to the force due to the magnetization of magnetic materials. Superparamagnetic magnetite nanoparticles are synthesized and used in this work. When the aqueous solution of magnetite nanoparticle is placed under magnetic field, the magnetic weight of the sample jumps instantaneously by Neel and Brown mechanisms and thereafter increases steadily following a stretched exponential function as the nanoparticles agglomerate, which results from the distribution of energy barriers involved in the dynamics. Thermal motions of nanoparticles in the agglomerate perturb the ordered structure of the agglomerate to reduce the magnetic weight. Fluctuation of the structural order of the agglomerate by temperature change is much faster than the formation of agglomerate and explained well with the Boltzmann distribution, which suggests that the magnetic weight of the agglomerate works as a magnetic thermometer.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/987/1/012036