物理化学学报 >> 2008, Vol. 24 >> Issue (08): 1519-1523.doi: 10.3866/PKU.WHXB20080833

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酸诱导介观相转变硅基介孔材料的合成机理及其改性

金政伟; 汪晓东   

  1. 天津科技大学包装与印刷工程学院, 天津 300222; 北京化工大学材料科学与工程学院, 北京 100029
  • 收稿日期:2008-02-21 修回日期:2008-04-14 发布日期:2008-08-06
  • 通讯作者: 金政伟 E-mail:jzhengw@tust.edu.cn

Mechanism of Acidity-Induced Mesostructure Transformation for Highly Ordered Mesoporous Silica Materials and Their Functionalizations

JIN Zheng-Wei; WANG Xiao-Dong   

  1. School of Packaging and Printing Engineering, Tianjin University of Science and Technology, Tianjin 300222, P. R. China; School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
  • Received:2008-02-21 Revised:2008-04-14 Published:2008-08-06
  • Contact: JIN Zheng-Wei E-mail:jzhengw@tust.edu.cn

摘要: 采用两步法以三嵌段共聚物P104(PEO27-PPO61-PEO27)为模板剂合成介孔材料, 研究了介孔材料结构随体系pH 值的变化, 探讨了体系中介观相转变的机理. 研究表明,随着pH 的升高, 发现体系中无机物种和模板剂所组成的介观相发生了转变,由P6mm 的SBA-15(pH=1.51-2.67)2D六角孔道结构转变为3D 蠕虫状孔道的MSU-X(pH=3.93-4.56)结构. 对所得的两种不同种类的硅基材料以γ-胺丙基三乙氧基硅烷(APTES: NH2(CH2)3Si(C2H5O)3)进行表面烷基化改性结果表明, 在同样的条件下, 经过改性后MSU-X类介孔材料孔壁上接枝的烷基数目要远超过SBA-15 类介孔材料.

关键词: 硅基介孔材料, 酸诱导, 介观相转变, 表面改性

Abstract: Highly ordered mesoporous silica materials were synthesized by templating with a nonionic triblock copolymer (Pluronic P104(PEO27-PPO61-PEO27)) via a two-step pathway in mildly acidic conditions. The mechanism of this transformation was also investigated. It was found that a mesostructure transformation could be induced by adjusting acidity from the SBA-15 type 2-dimentional hexagonal channel mesostructure (pH=1.51-2.67) to the MSU-X type with 3-dimentional worm-like mesostructure (pH=3.93-4.56) in the same synthetic system. After modified by γ-(aminopropyl) triethoxysilane (APTES) under the same condition, it was indicated that the MSU-X type was more easily modified by APTES than SBA-15 type.

Key words: Mesoporous silica material, Acidity-induced, Mesostructure transformation, Surface modification

MSC2000: 

  • O647