物理化学学报 >> 2013, Vol. 29 >> Issue (07): 1524-1533.doi: 10.3866/PKU.WHXB201304273

软物质 上一篇    下一篇

聚乙二醇-四氧化三铁纳米粒子复合材料的结构、物理性质及应用

夏娟1, 宋乐新1,2, 党政2, 邵志成2   

  1. 1 中国科学技术大学材料科学与工程系, 合肥 230026;
    2 中国科学技术大学化学系, 合肥 230026
  • 收稿日期:2013-02-25 修回日期:2013-04-27 发布日期:2013-06-14
  • 通讯作者: 宋乐新 E-mail:solexin@ustc.edu.cn
  • 基金资助:

    国家自然科学基金(21071139)资助项目

Polyethylene Glycol/Fe3O4 Nanoparticle Composite Materials: Structure, Physical Properties and Application

XIA Juan1, SONG Le-Xin1,2, DANG Zheng2, SHAO Zhi-Cheng2   

  1. 1 CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineerin, University of Science and Technology of China, Hefei 230026, P. R. China;
    2 Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
  • Received:2013-02-25 Revised:2013-04-27 Published:2013-06-14
  • Contact: SONG Le-Xin E-mail:solexin@ustc.edu.cn
  • Supported by:

    This project was supported by the National Natural Science Foundation of China (21071139).

摘要:

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.

关键词: 纳米粒子, 聚乙二醇, 四氧化三铁, 微波吸收, 软铁磁性, 复合物

Abstract:

Fe3O4 nanoparticles with a highly symmetric octadecahedral nanobox structure were fabricated using β-cyclodextrin as a protection agent. A series of composites (CM-1-CM-4) of polyethylene glycol (PEG) and Fe3O4 nanoparticles with different initial mass ratios were prepared using a colloid process. We found that the shape of the composites depended on the amount of Fe3O4 nanoparticles. In particular, the melting process of PEG was not only influenced by the presence of Fe3O4 nanoparticles, but also by their amount. We also noticed that the crystallinity of PEG lowered upon compositing with Fe3O4 nanoparticles, and decreased as the amount of Fe3O4 nanoparticles increased with the exception of CM-4. Interestingly, the degradation of PEG was affected by the Fe3O4 nanoparticles, leading to the appearance of different degradation products. Like the initial Fe3O4 nanoparticles, the Fe3O4 components in the composites exhibited typical soft ferromagnetism but possessed much lower saturation magnetizations. X-ray photoelectron spectroscopy (XPS) experiments revealed that electronic shift occurred from iron to oxygen. The resulting decrease in the electronic density of iron explained the observed decrease in saturation magnetizations of the composites. The composites induced strong surface-enhanced Raman scattering of organic dyes that depended on the amount of Fe3O4 nanoparticles in the composite. This study contributes to the development of composite materials combining polymers with inorganic nanoparticles.

Key words: Nanoparticle, Polyethylene glycol, Fe3O4, Microwave absorption, Soft ferromagnetism, Composite

MSC2000: 

  • O649