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利用碳化法制备抗紫外线稀土白炭黑复合材料并对其性能加以研究。研究中发现,通过添加一定量的氯化铈与水玻璃自发形成共沉淀内核,继以碳化法形成二氧化硅包覆外壳,制备出一种高效抗紫外线改性白炭黑复合材料。由紫外吸收光谱检测可知,该改性白炭黑可以有效屏蔽200 nm~400 nm波长的紫外线;经过XPS对共沉淀内核测试,确定Ce氧化物为稳定氧化物CeO_2,10 nm深度透射未发现Ce~(4+)特征峰,证明包覆完全。IR分析表明,特征峰发生了不同程度蓝移。扫描电镜对内核形貌观察,共沉淀形成内核为CeO_2纳米颗粒镶嵌在SiO_2骨架中,该结构可以发挥纳米稀土材料的小尺寸效应,而不受纳米粉体粒度过小引起团聚失效的限制,达到最佳抗紫外线性能。
Preparation of carbon black anti-UV rare earth silica composites and their properties to be studied. The study found that by adding a certain amount of cerium chloride and water glass spontaneously formed coprecipitated core, followed by the formation of carbon dioxide coating shell, prepared a highly efficient anti-UV modified silica composites. By UV absorption spectroscopy, we can see that the modified silica can effectively shield the UV wavelength from 200 nm to 400 nm. After XPS tests on the coprecipitated core, it was confirmed that the Ce oxide was the stable oxide CeO 2 and no Ce ~ (4 +) characteristic peak, proved completely coated. IR analysis showed that the characteristic peaks were blue-shifted to some extent. Scanning electron microscopy observation of the core morphology, the co-precipitation of the core is CeO 2 nanoparticles embedded in the SiO 2 framework, the structure can play a small size effect of nano-rare earth materials, nano particles without the particle size is too small to cause agglomeration failure limit reached Best anti-UV performance.