反应条件对SiO_2胶体微球结构色的影响

Effect of Reaction Conditions on the Structural Color of SiO_2 Colloidal Microspheres

以氨水作为催化剂,正硅酸乙酯(TEOS)为硅源,在乙醇介质中合成了SiO2胶体微球;采用垂直沉积法,通过SiO2胶体微球自组装的方式,在玻璃表面制备了不同色彩的结构色。利用XRD、FT-IR对样品进行了表征,并用SEM分析了SiO2胶体微球的形貌;研究了不同反应条件对SiO2胶体微球结构色的影响,并探讨了胶体微球的形成机理。结果表明,实验制得的粉体是一种非晶态的二氧化硅,SiO2胶体微球结构色随氨水和TEOS用量的增加向可见光红色光波段偏移;随着反应温度的升高,胶体微球结构色向可见光蓝紫光波段偏移;随着反应时间的增加,SiO2微球结构色先趋于红色然后变为白色。根据这些影响因素可以合成颜色可控的SiO2胶体微球结构色。

SiO2 colloidal microspheres were prepared by using ammonia as a catalyst and TEOS as a silicon source inalcohol solvent.The preparation of structural color on the glass surface was through the self-assembly of SiO2 colloidal microspheres by vertical deposition. The samplewas represented by XRD and FT-IR, the morphology of SiO2 colloidal microspheres were characterized by using a scanning electron microscope（SEM）, the effects of different reaction conditions and the formation mechanism of colloidal microspheres were studied in this paper studied. The result shows that synthetic powder is amorphous silica and the color of SiO2 colloidal microspheres moves to red side ofvisible light wave bandwith the increase of ammonia and TEOS. The color of SiO2 colloidal microspheres moves to blue-purple side ofvisible light wave bandwith the increase of reaction temperature. The color of SiO2 colloidal microspheres moves to red and then to white with the increase of reaction hours. Besides, the controlled structural colors were obtained by adjusting the process parameters.