摘要
This work examines the origin of the abnormal magnetism exhibited by Cu Mn Fe-PBAs modified with multi-walled carbon nanotubes(MWCNTs).The system of Cu Mn Fe-PBAs@MWCNTs coexists with both large and small clusters.Cu Mn Fe-PBAs clusters have an average particle size of 28 nm,and some of the smaller particles are adsorbed on the surface of MWCNTs.Surprisingly,the magnitude of magnetization increases linearly with decreasing temperature.When above the Curie temperature,the magnitude of magnetization is significantly greater than that of PBAs without being modified.This phenomenon can be attributed to magnetostatic interactions between ultra-fine magnetic nanoparticles adsorbed on the surface of MWCNTs.Using the Monte Carlo method,we simulated the magnetostatic interaction of cylindrical adsorbed particles,and the simulation results are almost identical to those observed experimentally.The results indicate that 0.089Cu Mn Fe-PBAs clusters per 1 nm^(2)can be adsorbed onto the surface area of MWCNTs.We demonstrate that MWCNTs adsorbing magnetic particles exhibit magnetic behavior,and suggest a method for producing ultrafine materials.It also introduces a new method of calculating the adsorption efficiency of carbon nanotubes,offering theoretical guidance for future research on nanomaterials with enhanced adsorption efficiency.
作者
莫家俊
夏溥越
沈纪宇
陈海文
陆泽一
徐诗语
张庆航
夏艳芳
刘敏
Jia-Jun Mo;Pu-Yue Xia;Ji-Yu Shen;Hai-Wen Chen;Ze-Yi Lu;Shi-Yu Xu;Qing-Hang Zhang;Yan-Fang Xia;Min Liu(College of Nuclear Science and Technology,University of South China,Hengyang 421001,China;College of Energy,Xiamen University,Xiamen 361005,China)
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.11447231 and 12105137)
the National Undergraduate Innovation and Entrepreneurship Training Program Support Projects of China
the Natural Science Foundation of Hunan Province,China(Grant No.2020JJ4517)
the Research Foundation of Education Bureau of Hunan Province,China(Grant Nos.19A434,19A433
19C1621)
the Opening Project of Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment,University of South China(Grant Nos.2019KFY10 and2019KFY09)。