Zhu Shenmin, Zhang Di, Li Zhiqiang, Furukawa Hiroyasu, Chen Zhixin
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 200030, Shanghai, PR China.
Langmuir. 2008 Jun 17;24(12):6292-9. doi: 10.1021/la7037153. Epub 2008 May 20.
A novel method for duplicating the hierarchical structures of biological substances at nanometer resolution in manganese oxides has been developed. This innovation uses natural biomorphic specimens, such as butterfly wing, cotton, and wood as templates. The biotemplates were first treated with either HCl/NaOH or HCl/H2O2/NaOH and then mixed with an aqueous solution of KMnO4. The treated biological materials were then ultrasonically irradiated, and finally, the biological templates were removed by calcination in air at temperatures between 500 and 800 degrees C. The structures of the resulting manganese oxides were characterized by a combination of XRD, FE-SEM, TEM and EDS. It was found that the fine hierarchical structures of the biological templates down to the nanometer scale were faithfully duplicated, and the duplication was positive. A mechanism for the positive replication is proposed and discussed in terms of the effects of the sonochemical reaction as well as the surface modification prior to the sonochemical reaction. The same sonochemical method can be extended to the duplication of intricate hierarchical structures of other biological forms in a large range of metal oxides.
一种在氧化锰中以纳米分辨率复制生物物质层次结构的新方法已被开发出来。这项创新使用天然生物形态标本，如蝴蝶翅膀、棉花和木材作为模板。生物模板首先用HCl/NaOH或HCl/H₂O₂/NaOH处理，然后与KMnO₄水溶液混合。接着对处理过的生物材料进行超声辐照，最后通过在500至800摄氏度的空气中煅烧去除生物模板。通过XRD、FE-SEM、TEM和EDS相结合的方法对所得氧化锰的结构进行了表征。结果发现，生物模板精细到纳米尺度的层次结构被忠实地复制，且复制是正向的。提出并讨论了正向复制的机制，涉及声化学反应的影响以及声化学反应之前的表面改性。相同的声化学方法可以扩展到在大范围的金属氧化物中复制其他生物形态的复杂层次结构。
