二氧化硅胶体球的制备、改性及其胶体晶体的组装

Preparation and modification of SiO_2 colloidal spheres and it's self-assembly

采用改进的Stber法制备了单分散性较好、表面光滑的SiO2球形颗粒,将丁二酸化学键合于SiO2胶体球表面以提高其Zeta电势,再采用垂直沉积法在水溶液中制备出SiO2胶体晶体。通过X射线衍射仪、场发射扫描电子显微镜（SEM）和Zeta电位粒度仪对颗粒和胶体晶体的晶型、显微形貌、电学性能进行测试分析。结果表明：所得SiO2颗粒为无定形态,SiO2颗粒均为完整的球形颗粒,粒径在150~360nm范围内;不同粒径SiO2颗粒经丁二酸改性后Zeta电势均出现极大值,且改性后的SiO2微球组装的胶体晶体排列紧密有序,呈现密堆垛结构。

Monodisperse SiO2 particles were synthesized by Stber method.The SiO2 particles were modified by butanedioic acid.And SiO2 colloidal crystal was fabricated by the vertical deposition method.The crystal formation,micromorphology and electrical properties were characterized by X-ray diffraction（XRD）,Scanning electron microscope（SEM） and Zeta potential instrument.The results show that the SiO2 particles are monodisperse non-crystalline solid particles with the particle size in 150~360nm.Zeta potential instrument indicates that the zeta potentials of the SiO2 specimens with different particle sizes reach the maximum values when the modified amount of butanedioic acid is 1.5g in the 50mL acetonitrile solvents.And the colloidal crystal prepared by modified SiO2 microspheres has more ordered structure.