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在β-环糊精作保护剂条件下,制备了高对称的十八面体四氧化三铁(Fe3O4)纳米材料.通过胶体化学方法,合成了一系列不同起始计量比的聚乙二醇(PEG)和Fe3O4纳米粒子复合物(CM-1-CM-4).这些PEG复合材料展示出重要特性:首先,它们的表面形貌依赖于Fe3O4的计量;其次,PEG的熔化过程受Fe3O4的影响,并且直接与Fe3O4的含量相关;进一步研究表明,除CM-4外,Fe3O4的引入导致PEG结晶度下降,而且Fe3O4纳米粒子量越少,降低幅度越大;更为有趣的是,PEG的降解过程受制于Fe3O4纳米粒子的影响,导致不同降解产物的出现;而且,与纯Fe3O4纳米粒子一样,复合材料中的Fe3O4也显示典型的软铁磁性行为,但饱和磁化强度相对较小;此外,X射线光电子能谱(XPS)实验揭示在这些PEG复合材料中,有从Fe到O的电子转移,Fe电子密度的降低可用来解释复合材料饱和磁化强度的减小;最后,这些PEG复合材料呈现出对有机染料的表面增强拉曼效应,并且这种效应随Fe3O4纳米粒子含量的增加而增加.这些结果将会对聚合物/无机纳米粒子复合材料的发展起到推进作用.
In the presence of β-cyclodextrin as protective agent, a highly symmetrical octahedron ferroferric oxide (Fe3O4) nanomaterial was prepared and a series of polyethylene glycol (PEG) with different starting ratios were synthesized by colloidal chemistry ) And Fe3O4 nanoparticle composites (CM-1-CM-4). These PEG composites exhibit important properties: firstly, their surface morphology depends on the measurement of Fe3O4; secondly, the melting of PEG is influenced by Fe3O4, And directly related to the content of Fe3O4. Further studies showed that the introduction of Fe3O4 led to the decrease of the crystallinity of PEG except for CM-4, and the decrease of the amount of Fe3O4 nanoparticles was larger. The more interesting was that the degradation process of PEG Due to the influence of Fe3O4 nanoparticles, different degradation products were observed. Moreover, like pure Fe3O4 nanoparticles, Fe3O4 in the composite also showed typical soft ferromagnetic behavior, but the saturation magnetization was relatively small. In addition, X-ray Photoelectron spectroscopy (XPS) experiments revealed that there was electron transfer from Fe to O in these PEG composites and the decrease of Fe electron density could be used to explain the decrease of saturation magnetization of the composites; finally, these PEG composites showed a Organic dyes Surface-enhanced Raman effect, and this effect increases as the content of Fe3O4 nanoparticles increases. These results will play a role in promoting the development of polymer / inorganic nanoparticle composite.