以氨水为催化剂、正硅酸乙酯为硅源、醇为溶剂,采用改进的溶胶-凝胶工艺制备单分散SiO2微球,通过扫描电镜、激光粒度分析仪着重研究了正硅酸乙酯添加方式、反应温度、溶剂类型等单因素对SiO2的颗粒大小和形貌的影响.结果表明,正硅酸水解对醇溶剂是有选择性的,乙醇作为溶剂合成SiO2的单分散性和球形度最好.连续滴定和分步滴定更有利于单分散SiO2微球的形成.水解温度升高,生成的颗粒粒径将运渐增大,最佳反应温度为常温25℃或恒温水浴25～35℃.
Monodispersed silicon dioxide spherical particles are synthesized by improved sol-gel methods,using ammonia as catalyst, tetraethoxy silane(TEOS) as silica source and ethanol as solvent. The effect of adding method,reaction temperature,solvent types of TEOS on the particle size and morphology of silicon dioxide is studied by scanning electron microscope(SEM) and laser particle size analyzer. The results show that hydrolysis of ortho silicate is selective to alcohol solvent,monodispersity and sphericity of silicon dioxide are best using ethanol as solvent. continuous titration and stepwise titration are more beneficial to the formation of monodispersed silicon dioxide spherical particles.The particle size increases gradually with the rise of hydrolysis temperature, the best reaction temperature is room temperature 25℃ or constant temperature water bath 25～35℃.
参考文献
| [1] | Stober W;Frink A .Controlled growth of monodisperse silica spheres in the micron size[J].Colloid Inter Sci,1968,26:62. |
| [2] | Johnson N P;Mccomb P W et al.Synthesis and optical properties of opal and inverse opal photonic crystals[J].Synthetic Metals,2001,116:469. |
| [3] | Orlin D. Velev;Abraham M. Lenhoff .Colloidal crystals as templates for porous materials[J].Current opinion in colloid & interface science,2000(1/2):56-63. |
| [4] | Mandal T K;Fleming M;Walt D R .Production of hollow polymeric microspheres by surface-confined living radical polymerization on silica templates[J].Chemistry of Materials,2000,12:3481. |
| [5] | Zhong Kaifu;Pu Jin;Chen Qianwang .Ni hollow nanospheres:Preparation and catalytic activity[J].J Nanomater,2006,10:1. |
| [6] | 曲会英,杨黄浩,林鹏,李顺华,杨薇,许金钩.荧光团杂化纳米SiO2微球作为生物标记探针的应用研究[J].高等学校化学学报,2003(03):422-424. |
| [7] | 董鹏 .单分散SiO2颗粒的研究进展[J].自然科学进展,2000,10(03):201. |
| [8] | 祝名伟 .光子晶体用SiO2-Ag-SiO2核壳结构亚微米微球制备与性能研究及自组[D].杭州:浙江大学,2002. |
| [9] | 丛海林,曹维孝.二氧化硅胶体晶体及其为模板的多孔材料[J].高等学校化学学报,2005(03):535-539. |
| [10] | 张辉,赵晓峰,唐清,李文超.统计模试识别技术在单分散二氧化硅微球制备过程中的应用[J].中国粉体技术,2003(01):18-20. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%