The effect of ions doping on the temperature-dependence magnetism of ferrite nanoparticles and ferrofluids
ID:19 Submission ID:50 View Protection:ATTENDEE Updated Time:2023-06-05 22:59:02 Hits:486 Poster Presentation

Start Time:2023-06-10 12:32 (Asia/Shanghai)

Duration:1min

Session:[E] Poster » [E] Poster

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Abstract
A series of ferrite nanoparticles, such as Fe3O4, ZnxFe3-xO4,Mn1-xZnxFe2O4, and DyxFe3-xO4, were prepared by adjusting ions doping via chemical coprecipitation. The ferrite particles were coated by surfactant and separately dispersed for synthesizing various perfluoropolyether oil (PFPE-oil) based ferrofluids. The micro-structures, magnetization-temperature of nanoparticles and ferrofluids were characterized by VSM, Mössbauer Spectrum, XRD, FTIR and TEM, respectively. The results show that with increasing ion doping, the saturation magnetization of various ferrite nanoparticles increase firstly and then reduces at room temperature. The thermomagnetic coefficient kT (kT=ΔM/ΔT) of various nanoparticles are also great different. The ferrite nanoparticles with the maximum saturation magnetization could be obtained, and the magnetization-temperature of ferrofluids could be significantly improved by preferably matching ferrite particles,  and the ferrofluids could be used in under various tempertuare environments, such as high temperature, low temperature and variable temperature. Our results are useful for basic research and for promoting the sealing application under various temperatures.
 
Keywords
Ferrite nanoparticles, Magnetism-temperature, Ferrofluids, Ions doping
Speaker
Fang Chen

Submission Author
Fang Chen
Yan Zhaoqiang Yan
Li Zhenggui Li Xihua University
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