采用原位碘化学沉积法制备了I_2/碳纤维布复合材料作为二次水系锌离子电池正极材料。用扫描电子显微镜法(SEM)、X射线衍射光谱法(XRD)、热重分析和电化学性能测试对所得样品的结构、形貌、稳定性和电化学性能进行了表征。测试结果表明,...采用原位碘化学沉积法制备了I_2/碳纤维布复合材料作为二次水系锌离子电池正极材料。用扫描电子显微镜法(SEM)、X射线衍射光谱法(XRD)、热重分析和电化学性能测试对所得样品的结构、形貌、稳定性和电化学性能进行了表征。测试结果表明,碘以非晶态的形式均匀分布在碳纤维布里,提高了碘的热稳定性,在0.5 C充放电倍率下,样品的首次可逆比容量为257 m Ah/g,经过200次循环后,容量保持率为90%,表现出良好的可逆比容量和循环稳定性能。展开更多
Determining the microstructure in human cementum might help us design new kinds of replacement materials for the treatment of teeth injury and disease. The authors characterized the nanostructures in the cementum of h...Determining the microstructure in human cementum might help us design new kinds of replacement materials for the treatment of teeth injury and disease. The authors characterized the nanostructures in the cementum of health human teeth via scanning electronic microscopy（SEM）. It was found that the acellular cementum is mainly composed of two kinds of nanostructures―inorganic nanoparticles and organic nanofibers. And the inorganic nanoparticles show a tendency to arrange along the organic nanofibers. Based on the micro-molding in capillary strategy, the distribution of organic component in acellular cementum was copied with UV curable resin. After removing the inorganic nanoparticles by acid etching, many isolated spindle shape nanopores were left in polymer, which su- ggested that the inorganic nanoparticles should have been isolated by the organic component in cementum, and should be oval or nanosheet in shape. We hope the present work could provide reference for the biomimetic preparation of tissue engineering materials, and help us design new types of tooth implant.展开更多
文摘采用原位碘化学沉积法制备了I_2/碳纤维布复合材料作为二次水系锌离子电池正极材料。用扫描电子显微镜法(SEM)、X射线衍射光谱法(XRD)、热重分析和电化学性能测试对所得样品的结构、形貌、稳定性和电化学性能进行了表征。测试结果表明,碘以非晶态的形式均匀分布在碳纤维布里,提高了碘的热稳定性,在0.5 C充放电倍率下,样品的首次可逆比容量为257 m Ah/g,经过200次循环后,容量保持率为90%,表现出良好的可逆比容量和循环稳定性能。
基金Supported by the National Natural Science Foundation of China(No.30830108)the National Basic Research Program of China(No.2007CB936402)
文摘Determining the microstructure in human cementum might help us design new kinds of replacement materials for the treatment of teeth injury and disease. The authors characterized the nanostructures in the cementum of health human teeth via scanning electronic microscopy（SEM）. It was found that the acellular cementum is mainly composed of two kinds of nanostructures―inorganic nanoparticles and organic nanofibers. And the inorganic nanoparticles show a tendency to arrange along the organic nanofibers. Based on the micro-molding in capillary strategy, the distribution of organic component in acellular cementum was copied with UV curable resin. After removing the inorganic nanoparticles by acid etching, many isolated spindle shape nanopores were left in polymer, which su- ggested that the inorganic nanoparticles should have been isolated by the organic component in cementum, and should be oval or nanosheet in shape. We hope the present work could provide reference for the biomimetic preparation of tissue engineering materials, and help us design new types of tooth implant.
