【作者】 陈喆； 施婷婷； 陈启明； 马士禹； 陈邦林；

【Author】 Zhe Chen;Tingting Shi;Miao Yu;Qiming Chen;School of Chemistry and Molecular Engineering,East China Normal University;

【机构】 华东师范大学化学与分子工程学院；

【摘要】 胶体晶体因其独特的光学性质在光子晶体、传感器、反蛋白石材料和其他领域具有广泛的应用。本文采用St?ber法制备单分散二氧化硅胶粒,探究了TEOS浓度、氨水浓度、水浓度、反应体系温度和溶剂类型对二氧化硅胶粒的粒径和单分散性的影响。采用气液界面自组装法,将自制的SiO2微球分散到不同的分散剂中,制备成不同浓度的悬浮液,采用自制实验装置制备了二维二氧化硅胶体晶体,经过层层取膜得到三维的二氧化硅胶体晶体,在水-空气界面处形成的二氧化硅胶体晶体膜容易转移到固体基底上,并研究了悬浮液浓度、分散剂类型、pH、二氧化硅粒径、干燥温度对胶粒自组装的影响。图a的紫外吸收光谱显示二氧化硅颗粒用甲醇、乙醇、正丙醇、正丁醇作为分散剂,制备得到的三维二氧化硅胶体晶体透过率不同,使用甲醇作为分散剂得到的紫外可见光谱图光子带隙最深,说明组装得到的三维胶体晶体的有序性最好。图b的紫外吸收光谱显示用不同浓度的二氧化硅悬浮液制备得到的三维二氧化硅胶体晶体透过率不同,在二氧化硅为2wt%时光子带隙最深,说明此时组装的有序性最好。更多还原

【Abstract】 Colloidal crystals have a wide range of applications in photonic crystals, sensors, inverse opal materials and other fields due to their unique optical properties. In this paper, the St?ber method was used to prepare monodisperse silica colloid. The effects of TEOS concentration, ammonia concentration, water concentration, reaction system temperature and solvent type on the particle size and monodispersity of silica colloid were investigated. The self-assembly method of gas-liquid interface was used to disperse the self-made SiO2 microspheres into different dispersing agents to prepare suspensions with different concentrations. Two-dimensional silica colloidal crystals were prepared by self-made experimental equipment. A three-dimensional silica colloidal crystal is obtained by loop operation, and the silica colloidal crystal film formed at the water-air interface is easily transferred to a solid substrate, and the effects of the suspension concentration, dispersant type, pH, silica particle size, and drying temperature on the self-assembly of the colloidal particles are studied. The UV absorption spectrum in Figure a shows that silica particles with methanol, ethanol, n-propanol, n-butanol as a dispersant, prepared three-dimensional silica colloidal crystals with different transmittance. UV-visible spectra obtained using methanol as a dispersant the photonic band gap is the deepest, indicating that the assembled three-dimensional colloidal crystal has the best order. The UV absorption spectrum in Figure b shows that the three-dimensional silica colloidal crystal prepared by different concentrations of silica suspension has different transmittance. The photonic band gap is the deepest when the silica is 2 wt%, indicating the order of assembly at this time is the best.更多还原