原位构造超顺磁性纳米氧化铁/甲壳素复合凝胶  

In-situ Formation of Iron Oxide / chitin Nanocomposite Gels with Super Paramagnetic Properties

作　　者：邵宇[1] 桑秋章[1] 王雯静[1] 李国祥[1] 

机构地区：[1]湖北民族学院化学与环境工程学院,湖北恩施445000

出　　处：《湖北民族学院学报（自然科学版）》2015年第4期449-452,共4页Journal of Hubei Minzu University(Natural Science Edition)

基　　金：湖北省教育厅中青年项目(Q20122907)

摘　　要：以氯化铁为前驱体溶液、甲壳素凝胶为基质,成功制备了含有大量氧化铁纳米粒子的甲壳素复合凝胶.通过扫描电镜(SEM)、红外(FT-IR)、X-衍射(XRD)、热重分析和磁强计分析(VSM),考察了复合材料的结构和性能.结果显示:粒径为22.5~33.7 nm的球形氧化铁纳米粒子均匀的分散和固载在甲壳素基体中,且随着前驱体溶液浓度从0.05 mol/L增至0.5 mol/L,氧化铁纳米粒子的量从9 wt.%逐渐增加至45 wt.%;复合纳米材料有非常小的磁滞回线和较低的矫顽力.提供了一种制备高含量磁性纳米离子复合凝胶的绿色方法.Chitin nanocomposite gels containing high contents of Fe2 O3 nanoparticles were successfully prepared with chitin gels as a matrix and FeCl3 as precursors. The structure and properties of the nano?composites were investigated using scanning electron microscopy ( SEM) , fourier-transform infrared ( FT-IR ) , X-ray diffraction ( XRD ) , thermogravimetric analysis, and vibrating sample magnetometry ( VSM) . The results indicated that the spherical magnetic Fe2 O3 nanoparticles were homogeneously dis?persed and immobilized in the chitin matrix. With an increase in the concentration of precursors from 0.05 to 0.5 mol/L, the content of Fe2 O3 nanoparticles in the dried nanocomposites increased from 9 to 45 wt%, and the particle diameter increased from 22.5 to 33.7 nm. The magnetometric measurements revealed that superparamagnetic behavior of the nanocomposites, and they had extremely small hysteresis loop and low coercivity. This study provided a simple and“green” process for the preparation of biobased magnetic nanocomposite gels with high nanophase content.

关 键 词：甲壳素凝胶 氧化铁 磁性纳米材料 

分 类 号：O648.17[理学—物理化学]