Nonionic Block Copolymer and Anionic Mixed Surfactants Directed Synthesis of Highly Ordered Mesoporous Silica with Bicontinuous Cubic Structure
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- 作者：Dehong Chen ; Zheng Li ; Chengzhong Yu ; Yifeng Shi ; Zhendong Zhang ; Bo Tu ; and Dongyuan Zhao
- 刊名：Chemistry of Materials
- 出版年：2005
- 出版时间：June 14, 2005
- 年：2005
- 卷：17
- 期：12
- 页码：3228 - 3234
- 全文大小：479K
- 年卷期：v.17,no.12(June 14, 2005)
- ISSN：1520-5002
文摘
Mesoporous silica with Ia
d structure has been successfully prepared by using mixed surfactants ofcommercially available nonionic block copolymer P123 (EO20PO70EO20) and anionic sodium dodecylsulfate (SDS) as structure-directing agents through an acid-catalyzed silica sol-gel process. XRD, TEM,and N2 sorption measurements show that the products have highly ordered bicontinuous cubic mesostructurewith high surface area (~770 m2/g), large pore volume (~1.5 cm3/g), and uniform pore size (~10 nm).Effects of preparation parameters on the formation of the mesostructure have been extensively investigated.It is found that the molar ratios of SDS/P123 between 2.1 and 2.5 and that of silicic species to P123 inthe range from 40 to 75 are favorable for the formation of highly ordered Iad mesostructure. Prolonginghydrothermal treatment time leads to almost unchanged cell parameters of the products, whereas there isobvious increase of the pore sizes and pore volume. The results show that resultant template-freemesoporous silica products have excellent thermal stability, and they are more stable in N2 atmospherethan in air. Morphologies of the resultant materials can be further controlled by adding inorganic salt(such as Na2SO4) into the mixed surfactants system. Coral- and petaline-like mesoporous silica withcontinuous skeletons can be obtained. Understanding this synthesis system might be useful for economicaland large-scale production of mesoporous materials with controllable structures.
d structure has been successfully prepared by using mixed surfactants ofcommercially available nonionic block copolymer P123 (EO20PO70EO20) and anionic sodium dodecylsulfate (SDS) as structure-directing agents through an acid-catalyzed silica sol-gel process. XRD, TEM,and N2 sorption measurements show that the products have highly ordered bicontinuous cubic mesostructurewith high surface area (~770 m2/g), large pore volume (~1.5 cm3/g), and uniform pore size (~10 nm).Effects of preparation parameters on the formation of the mesostructure have been extensively investigated.It is found that the molar ratios of SDS/P123 between 2.1 and 2.5 and that of silicic species to P123 inthe range from 40 to 75 are favorable for the formation of highly ordered Iad mesostructure. Prolonginghydrothermal treatment time leads to almost unchanged cell parameters of the products, whereas there isobvious increase of the pore sizes and pore volume. The results show that resultant template-freemesoporous silica products have excellent thermal stability, and they are more stable in N2 atmospherethan in air. Morphologies of the resultant materials can be further controlled by adding inorganic salt(such as Na2SO4) into the mixed surfactants system. Coral- and petaline-like mesoporous silica withcontinuous skeletons can be obtained. Understanding this synthesis system might be useful for economicaland large-scale production of mesoporous materials with controllable structures.