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제125회 대한화학회 학술발표회 및 총회 Analysis of Thermal Fluctuation of Magnetic Weight of Magnetite Nanoparticles at different Agglomeration Conditions

2020년 2월 5일 11시 58분 06초
PHYS.P-230 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
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Physical Chemistry
저자 및
Hackjin Kim
Department of Chemistry, Chungnam National University, Korea

Agglomeration process of the magnetic nanoparticles under the magnetic field is studied by monitoring the magnetic weight of the sample. The magnetic weight measured with the electronic balance is the magnetic force that the magnetic sample experiences under the magnetic field. The magnetic weight of the single domain magnetite nanoparticles in aqueous solution increases slowly with fluctuation as the nanoparticles agglomerate. The magnetic weight results from the magnetization of the agglomerate, which restricts the motions of nanoparticles of the agglomerate. The fluctuation of the magnetic weight coincides with the temperature change. Thermal energy of the nanoparticles induces the structural relaxation of the agglomerate to reduce the order of the agglomerate, therefore, the magnetic weight decreases. We observe the agglomeration of the samples of different concentrations at different magnetic fields. The ratios of the magnetic weight at T, WM and the magnetic weight at the average temperature Ta, WF for the different samples are plotted against the temperature difference in the attached figure. In order to understand the thermal fluctuation of the magnetic weight, we employ the energy distribution function used for the dynamics of complex systems. The simulation results of the thermal fluctuation of the magnetic weight with the energy distribution function imply that the interparticle interactions play important roles in the agglomeration of high concentration samples at high magnetic fields. The interparticle interactions make the effective temperature lower than the experimental temperature by raising the magnetic anisotropy energy barrier.