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 ...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.展开更多
1 病例报告患者,女,46岁。因双侧乳腺肿物3年,于1995—02—18入院。1992年1月发现双侧乳腺各有一个约蚕豆大的肿物,无不适。近期双乳肿物明显增大,右腋扪及2个1 cm×1 cm 的圆形肿物,左腋下未发现肿物。查体:一般状况良好,双乳等大...1 病例报告患者,女,46岁。因双侧乳腺肿物3年,于1995—02—18入院。1992年1月发现双侧乳腺各有一个约蚕豆大的肿物,无不适。近期双乳肿物明显增大,右腋扪及2个1 cm×1 cm 的圆形肿物,左腋下未发现肿物。查体:一般状况良好,双乳等大,对称,右乳外上象限可扪及3 cm×4 cm 的圆形包块,质硬,表面粗糙,与周围组织边界不清,可移动,乳头无凹陷及溢液,皮肤无'桔皮样变'。展开更多
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+3 种基金the Natural Science Foundation of Hunan Province,China(Grant No.2020JJ4517)the Research Foundation of Education Bureau of Hunan Province,China(Grant Nos.19A434,19A43319C1621)the Opening Project of Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment,University of South China(Grant Nos.2019KFY10 and2019KFY09)。
文摘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.
文摘1 病例报告患者,女,46岁。因双侧乳腺肿物3年,于1995—02—18入院。1992年1月发现双侧乳腺各有一个约蚕豆大的肿物,无不适。近期双乳肿物明显增大,右腋扪及2个1 cm×1 cm 的圆形肿物,左腋下未发现肿物。查体:一般状况良好,双乳等大,对称,右乳外上象限可扪及3 cm×4 cm 的圆形包块,质硬,表面粗糙,与周围组织边界不清,可移动,乳头无凹陷及溢液,皮肤无'桔皮样变'。
