Wei Zhang, Zhi-cheng Zhang. Preparation of Manganese Oxide Hollow Spheres Using pH-responsive Microgels as Templates[J]. Chinese Journal of Chemical Physics , 2009, 22(3): 327-332. doi: 10.1088/1674-0068/22/03/327-332
Citation: Wei Zhang, Zhi-cheng Zhang. Preparation of Manganese Oxide Hollow Spheres Using pH-responsive Microgels as Templates[J]. Chinese Journal of Chemical Physics , 2009, 22(3): 327-332. doi: 10.1088/1674-0068/22/03/327-332

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

doi: 10.1088/1674-0068/22/03/327-332
Funds:  In summary, manganese oxide hollow spheres were synthesized via a template-based strategy. The shell thickness of the hollow spheres can be controlled by using different dosages of KMnO4, which was proven by TEM and SEM results. A probable formation mechanism for the hollow spheres is proposed in this work, and the deswelling of microgels accompanying the formation of the manganese oxide shell at the surface of microgels are believed to be key steps in the whole process. Further studies showed some microgels had an irreversible swelling/deswelling transition, and we believe the uneven cross-link extent was the main reason for this phenomenon. TGA results showed most of the weight of manganese oxide/microgels composite was contributed by organic templates, and it confirmed indirectly the core/shell structure of the manganese oxide/microgels composite.
  • Received Date: 2008-10-10
  • 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.
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Preparation of Manganese Oxide Hollow Spheres Using pH-responsive Microgels as Templates

doi: 10.1088/1674-0068/22/03/327-332
Funds:  In summary, manganese oxide hollow spheres were synthesized via a template-based strategy. The shell thickness of the hollow spheres can be controlled by using different dosages of KMnO4, which was proven by TEM and SEM results. A probable formation mechanism for the hollow spheres is proposed in this work, and the deswelling of microgels accompanying the formation of the manganese oxide shell at the surface of microgels are believed to be key steps in the whole process. Further studies showed some microgels had an irreversible swelling/deswelling transition, and we believe the uneven cross-link extent was the main reason for this phenomenon. TGA results showed most of the weight of manganese oxide/microgels composite was contributed by organic templates, and it confirmed indirectly the core/shell structure of the manganese oxide/microgels composite.

Abstract: 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.

Wei Zhang, Zhi-cheng Zhang. Preparation of Manganese Oxide Hollow Spheres Using pH-responsive Microgels as Templates[J]. Chinese Journal of Chemical Physics , 2009, 22(3): 327-332. doi: 10.1088/1674-0068/22/03/327-332
Citation: Wei Zhang, Zhi-cheng Zhang. Preparation of Manganese Oxide Hollow Spheres Using pH-responsive Microgels as Templates[J]. Chinese Journal of Chemical Physics , 2009, 22(3): 327-332. doi: 10.1088/1674-0068/22/03/327-332

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