化工学报 ›› 2008, Vol. 59 ›› Issue (10): 2638-2643.

• 材料化学工程与纳米技术 • 上一篇    下一篇

利用甲基纤维素辅助合成介孔二氧化硅微球

张志腾;杨立明;王玉军;骆广生;戴猷元   

  1. 清华大学化学工程系化学工程国家重点联合实验室
  • 出版日期:2008-10-05 发布日期:2008-10-05

Preparation of micrometersized mesoporous silica spheres assisted by methyl cellulose

ZHANG Zhiteng;YANG Liming; WANG Yujun;LUO Guangsheng; DAI Youyuan   

  • Online:2008-10-05 Published:2008-10-05

摘要:

通过调节硅酸四乙酯(TEOS)和嵌段聚合物F127(EO106PO70EO106)体系的pH值调控TEOS水解的速度,并利用甲基纤维素(MC)在水热条件下形成网格状液晶微滴结构的特点,一步诱导硅胶初级粒子聚沉制备微米级介孔氧化硅微球。研究了溶胶凝胶的温度、pH值对成球性和孔结构的影响,通过氮吸附(BET),X射线衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、马尔文激光粒度分析(Malven)等手段分析表征了介孔氧化硅微球的形貌和孔结构,实验结果表明通过向TEOS和F127体系中加入MC,在pH=1、80℃条件下一步水热晶化可以合成直径在4~6 μm、比表面积为450 m2·g-1、孔径为4.2 nm的介孔氧化硅微球。

关键词:

介孔, 形貌调控, 硅球, 甲基纤维素

Abstract:

Based on the methyl cellulose’s (MC) function of forming liquid crystal in aqueous solution, the micrometersized mesoporous silica spheres with good dispersivity were synthesized in one step by adding MC into the aqueous solution containing F127 and TEOS (tetraethyl orthosilicate) with the appropriate pHThe effects of temperature and pH were investigatedIt was found that in suitable synthesis condition (pH=1 and 80℃ of hydrothermal temperature) mesoporous silica spheres possessing 4.2 nm of pores diameter, 450 m2·g-1 of specific area and 4—6 μm of particle diameter were synthesized.

Key words:

介孔, 形貌调控, 硅球, 甲基纤维素