IEC 137 |
| Jikang Yuan, Institute of Materials Science, University of Connecticut, 97 N. Eagleville Rd., Storrs, CT 06269 and S.L. Suib, Department of Chemistry, University of Connecticut, 55 N. Eagleville Rd., Storrs, CT 06269. |
| Manganese oxide octahedral molecular sieve (OMS) hollow nanospheres with mesoporous structures have been successfully synthesized via "template-free" reaction of permanganic acid with manganese sulfate monohydrate at room temperature for 4 hours. These hollow nanospheres are composed of gamma-MnO2 (1x2 tunnels with some intergrowth of 1x1 tunnels) hexagonal flakes. The nanospheres can be used as precursors in order to synthesize other manganese oxide nano-rods and nano-fibers with different tunnel structures. Under hydrothermal conditions and pH equal to 2.5 at 200 centigrade for 24 hours, nano-rods of beta-MnO2 (1x1 tunnels) were obtained. When the pH is around 7 and under hydrothermal conditions at 200 centigrade for 24 hours, fibrous manganite (1x1 tunnels) was synthesized. Using hard templates such as Ba2+ and K+ cations and under hydrothermal conditions (240 centigrade, 48 hours), the hollow nanospheres can be converted into OMS-2 (2x2 tunnels) materials with fibrious morphologies. The hollow nanospheres and the following nano-rods and nanofibers synthesized can be applied to cathodic battery materials, catalysis, catalyst carriers, or as adsorbents for pollutants. |
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Nanotechnology and the Environment
5:00 PM-7:00 PM, Tuesday, March 25, 2003 Convention Center -- Hall G, Poster
Division of Industrial and Engineering Chemistry |