| pH值对CeO2/SiO2纳米复合磨粒分散性的影响 |
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| 引用本文： | 陈国美,周凌,倪自丰,徐来军,杜春宽,陈凤,苏敏,赵永武.pH值对CeO2/SiO2纳米复合磨粒分散性的影响[J].金刚石与磨料磨具工程,2020,40(5):45-50. |
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| 作者姓名： | 陈国美 周凌 倪自丰 徐来军 杜春宽 陈凤 苏敏 赵永武 |
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| 作者单位： | 1. 无锡商业职业技术学院 机电技术学院, 江苏 无锡 214153;2. 江南大学 机械工程学院, 江苏 无锡 214122;3. 无锡通用机械厂有限公司, 江苏 无锡 214115 |
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| 摘 要： | 以胶体SiO2溶液作硅源，采用均相沉淀工艺制备壳-核结构完整的CeO2/SiO2纳米复合磨粒。采用X射线衍射仪和透射电子显微镜对复合磨粒样品进行物相组成分析和微观形貌观察；通过粒径分布、Zeta电位分析，研究水相分散系中pH值对CeO2/SiO2复合磨粒分散性的影响。结果表明:所制备的CeO2/SiO2复合磨粒为壳-核包覆结构完整的纳米微球，粒径约110 nm，内核为无定形SiO2，壳层为立方萤石型CeO2；CeO2/SiO2复合磨粒的等电位点pH值约为5，其值由SiO2等电位点向CeO2等电位点明显偏移。CeO2/SiO2复合磨粒在酸性水相介质中分散性差，容易出现严重的团聚现象；而在碱性环境下，CeO2/SiO2复合磨粒分散性良好。
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| 关 键 词： | SiO2 CeO2 纳米复合磨粒 pH值 分散性 |
Effect of pH value on dispersity of CeO2/SiO2 composite nanoparticles |
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| CHEN Guomei,ZHOU Ling,NI Zifeng,XU Laijun,DU Chunkuan,CHEN Feng,SU Min,ZHAO Yongwu.Effect of pH value on dispersity of CeO2/SiO2 composite nanoparticles[J].Diamond & Abrasives Engineering,2020,40(5):45-50. |
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| Authors: | CHEN Guomei ZHOU Ling NI Zifeng XU Laijun DU Chunkuan CHEN Feng SU Min ZHAO Yongwu |
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| Affiliation: | 1. School of Mechanical and Electrical Engineering, Wuxi Vocational Institute of Commerce, Wuxi 214153, Jiangsu, China;2. School of Mechanical Engineering, Jiangnan University, Wuxi 214122, Jiangsu, China;3. Wuxi General Machinery Works Co., Ltd., Wuxi 214115, Jiangsu, China |
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| Abstract: | CeO2/SiO2 composite nanoparticles with complete core-shell structure were prepared through homogeneous precipitation method using commercial silica sol as silicon resource. The phase composition and nanotopography of the as-prepared particles were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM), respectively. The effect of pH value on the dispersity of CeO2/SiO2 composite nanoparticles in water suspension was studied by the analysis of size distribution and Zeta potential. The results indicated that the as-prepared composite nanoparticles possessed a complete core-shell structure which composed by amorphous silica core and cubic fluorite ceria shell. The particle size was about 110 nm. The equipotential point of CeO2/SiO2 composite nanoparticles was about pH5, and its value was significantly shifted from the equipotential point of SiO2 to the equipotential point of CeO2. The as-prepared composite nanoparticles agglomerated easily under the acidic condition, while dispersed well under the alkaline condition. |
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