基于pH响应型微凝胶模板的二氧化锰空心球制备

Preparation of Manganese Oxide Hollow Spheres Using pH-responsive Microgels as Templates

以pH响应型微凝胶为模板制备出了二氧化锰空心球材料，并利用XRD、TGA、SEM、FT—IR和TEM等手段对其进行了表征．结果表明，通过调节KMn04的用量可以有效控制二氧化锰空心球的球壳厚度．对洗脱后上层清夜中的pH响应型微凝胶进一步研究发现，部分微凝胶呈现出非可逆的膨胀一收缩转变，这一现象主要是由于其内部的交联程度不高造成的．在对表征结果进行分析后提出了空心球结构的形成机理．

Manganese oxide hollow spheres were prepared by a novel and facile approach using pH- responsive microgels as templates. The final products were thoroughly characterized with X-ray powder diffraction, thermogravimetric analysis, scanning electron microscopy, Fourier transform infrared, and transmission electron microscopy. The results reveal that the shell thickness of manganese oxide hollow spheres increased with the dosage of KMnO4, which implies that a controllable and feasible strategy for manganese oxide hollow spheres prepa- ration has been established. Further studies on the microgels template showed some of them had an irreversible swelling/deswelling transition due to the uneven cross-link extent. Based on the results, a probable formation mechanism for the hollow spheres was proposed.