摘要
主要研究了复合材料磁电阻特性,提出了复合材料的制备方法,并测量了材料形貌、磁化特性、磁电阻随磁场的变化特性。结果表明,复合材料在环境磁场中能够产生磁电阻效应,其磁电阻特性受材料中分散的纳米颗粒的磁化特性所影响,并且复合材料磁电阻随着材料中纳米颗粒的分散浓度的增大而增大。根据磁场环境下复合材料中纳米颗粒之间沿磁场方向的相互作用以及聚合物材料的粘弹性,重点分析了该复合材料的磁电阻变化机理并提出了复合材料的磁电阻变化模型。随后,利用纳米颗粒的磁化数据以及PDMS的动力学参数进行了复合材料磁电阻变化特性的数值仿真,并将仿真数据与实测数据进行对比,对比结果显示该模型能够准确描述复合材料的磁电阻变化特性。
The magnetoresistive effect of Fe3O4-PDMS nanocomposites was reported, and the preparation method was proposed. The fracture surface profile,magnetic property and magnetoresistance dependence of applied magnetic field were also measured. It can be seen from the results that the nanocomposite had magnetoresistive effect, which was influ enced by the magnetic property. The magnetoresistive effect was also increased with increasing the dispersion concentration of the nanoparticles. The magnetoresistive effect mechanism and model of the nanocomposite were proposed on the basis of the study on the magnetic attraction between neighbouring particles along the direction of magnetic field and the viscoelasticity characteristic of polymer. A series of mathematical simulation were performed to obtain calculated value of nanocom posite samples with different particles dispersion concentration. Through the comparison between the calculated value and the experimental value,it was concluded that the model can described the magnetoresistive effect of the nanocomposite.
出处
《化工新型材料》
CAS
CSCD
北大核心
2014年第11期113-116,共4页
New Chemical Materials
基金
国家自然科学基金(51375463)
