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首页> 外文期刊>Journal of Applied Polymer Science >Facile one-pot preparation of superparamagnetic chitosan sphere and its derived hollow sphere
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Facile one-pot preparation of superparamagnetic chitosan sphere and its derived hollow sphere

机译：一锅法制备超顺磁性壳聚糖球及其衍生的空心球

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摘要

A facile and robust approach is presented to prepare superparamagnetic chitosan (CS) spheres by simply dropping iron ions and CS mixture solution to ammonia aqueous solution. Fourier transform infrared spectra, X-ray diffractions, and thermogravimetric analyses of the obtained spheres indicate that the composite spheres consisted of CS and Fe_3O_4. The microstructures of the surface and the inner part of the sphere were observed by scanning electron microscope to indicate nano scale of the Fe_3O _4 component. The results suggest that the nano sized Fe _3O_4 particles can be stabilized by CS molecules in the matrix of sphere to avoid aggregation based on their binding interaction. Because of the nano scale distributed Fe_3O_4 particles, the composite spheres show superparamagnetic properties, and the saturation magnetization of the composite sphere increases linearly with the Fe _3O_4 content. An electron probe microanalyzer was employed to measure the energy dispersive spectra of the magnetic sphere, through which the element contents at different points along the radius of a magnetic CS sphere have been obtained. It has been found that the Fe_3O _4 content decreased gradually from outer surface to its inner core. Moreover, the composite sphere was calcined in air at 700°C to prepare spherical hollow sphere.
机译：通过简单地将铁离子和CS混合物溶液滴入氨水溶液中，提出了一种简便而稳健的方法来制备超顺磁性壳聚糖（CS）球。所得球的傅立叶变换红外光谱，X射线衍射和热重分析表明，复合球由CS和Fe_3O_4组成。通过扫描电子显微镜观察球的表面和内部的微观结构，以指示Fe_3O_4组分的纳米级。结果表明，纳米级的Fe _3O_4粒子可以被CS分子稳定在球体的基质中，从而避免了基于其结合相互作用的聚集。由于纳米级分布的Fe_3O_4颗粒，复合球表现出超顺磁性，复合球的饱和磁化强度随Fe_3O_4含量线性增加。利用电子探针显微分析仪测量了磁球的能量色散谱，从而获得了沿CS磁球半径的不同点的元素含量。已经发现，Fe_3O_4的含量从外表面到其内芯逐渐降低。此外，将复合球在空气中在700℃下煅烧以制备球形空心球。

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