溶胶-凝胶法室温合成介孔二氧化硅  

Synthesis of Mesoporous Silicas by Sol-Gel Method at Room Temperature

作　　者：王中平[1] 孙荣龙 周龙[1] 倪晓旭 

机构地区：[1]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《材料导报（纳米与新材料专辑）》2015年第1期62-65,共4页

摘　　要：以阳离子表面活性剂CTAB为模板,正硅酸四乙酯TEOS作硅源,在室温条件下制备介孔二氧化硅,用SEM、TEM、气体吸附等方法对产物进行表征,探究合成介孔二氧化硅的影响因素并解释合成机理。结果表明,较高的pH值以及较长的CTAB溶解时间明显改善了产物的孔径分布,EtOH的加入可提高体系的分散度,而单独控制TEOS水解效果甚微。Al 3+使得产物有序性下降,模板剂的去除方式影响试样外观和产率。说明合成过程是以CTAB形成的规则胶束为模板,TEOS嵌入至有序网络中,随后去除模板剂即得介孔结构。With the cationic surfactant CTAB as the template and tetraethylorthosilicate TEOS as the silicon source, mesoporous silicas were prepared under the condition of the room temperature and the products were characterized by the methods of SEM, TEM and gas adsorption to explore influencing factors on the synthesis process and explain the synthesis mechanism. The results show that the higher pH and the longer dissolution time of CTAB obviously improve the pore size distribution of the products. EtOH can increase the dispersion degree of the system, however, the individual controlling of TEOS hydrolysis has little effect. Al^3＋ decreased the regularity of the products, the removal ways of the templating agent affect the appearance and the yield of samples, indicating that the synthesis process is based on the regular micelles formed by CTAB as the template, and TEOS embeds into the ordered network, followed by the removal of the templating agent to obtain the mesoporous structure.

关 键 词：CTAB TEOS 介孔二氧化硅 孔径分布 合成机理 

分 类 号：O613[理学—无机化学]