用于工业和生物医学应用的混合单分散磁性α-Fe2O3 壳聚糖纳米复合膜的制备及性能。

Preparation and properties of hybrid monodispersed magnetic α-Fe2O3 based chitosan nanocomposite film for industrial and biomedical applications.

机构信息

Department of Chemistry, Motilal Nehru National Institute of Technology, Allahabad, Allahabad 211004, India.

出版信息

Int J Biol Macromol. 2011 Jan 1;48(1):170-6. doi: 10.1016/j.ijbiomac.2010.10.016. Epub 2010 Nov 4.

DOI:10.1016/j.ijbiomac.2010.10.016

Abstract

In this study, hydrothermally prepared magnetic α-Fe2O3 nanoparticles were dispersed in chitosan (CH) solution to fabricate nanocomposite film. X-ray diffraction (XRD) patterns indicated that the α-Fe2O3 nanoparticles were pure α-Fe2O3 with rhombohedral structures, and the fabrication of CH did not result in a phase change. The scanning electron microscopy (SEM) and transmission electron microscope (TEM) results showed that the hexagonal and spherical monodispersed α-Fe2O3 nanoparticles were encapsulated into the spherical dumb shaped CH-α-Fe2O3 nanocomposite film with a mean diameter of ∼87 and ∼110 nm respectively. The α-Fe2O3 nanoparticles and CH-α-Fe2O3 nanocomposite film were also characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and vibrating sample magnetometer (VSM). Magnetic measurements revealed that the saturated magnetization (Ms) and remanent magnetization (Mr) of the pure α-Fe2O3 nanoparticles reached 0.573 emu/g and 0.100 emu/g respectively and the nanoparticles showed the characteristics of weak ferromagnetic before and after coating with CH.

摘要

在这项研究中，水热法制备的磁性α-Fe2O3 纳米粒子分散在壳聚糖 (CH) 溶液中，以制备纳米复合膜。X 射线衍射 (XRD) 图谱表明，α-Fe2O3 纳米粒子为纯 α-Fe2O3，具有菱面体结构，而 CH 的制备并未导致相变。扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM) 结果表明，六方和球形单分散α-Fe2O3 纳米粒子分别被包裹在球形的 CH-α-Fe2O3 纳米复合膜中，平均直径约为 87nm 和 110nm。α-Fe2O3 纳米粒子和 CH-α-Fe2O3 纳米复合膜还通过傅里叶变换红外 (FTIR) 光谱、热重分析 (TGA)、差示扫描量热法 (DSC) 和振动样品磁强计 (VSM) 进行了表征。磁测量表明，纯α-Fe2O3 纳米粒子的饱和磁化强度 (Ms) 和剩余磁化强度 (Mr) 分别达到 0.573 emu/g 和 0.100 emu/g，并且在 CH 包覆前后，纳米粒子表现出弱铁磁性的特征。