Counterion and alcohol effect in the formation of mesoporous silica

被引:50
作者
Lin, HP
Kao, CP
Mou, CY [1 ]
机构
[1] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan
[2] Acad Sinica, Inst Atom & Mol Sci, Taipei 106, Taiwan
[3] Natl Taiwan Univ, Ctr Condensed Matter Res, Dept Chem, Taipei 106, Taiwan
关键词
mesoporous; hexagonal phase; Hofmeister; lyotropic; counterion;
D O I
10.1016/S1387-1811(01)00336-5
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The adsorption of silicate anions onto the cationic micellar surface and the slow condensation of silicate species control the early phase of the alkaline synthesis of mesoporous materials. We found that there exists a well-defined induction time (tp) of the transition from clear solution to white precipitation gel. The induction time tp increases with the concentration of added salt NaX. At a fixed concentration of the salts, the tp decreases in the order: ClO3- > NO3- > Br- > SO32-, SO32- > Cl- > F-, with F- being the most effective ion in forming the hexagonal phase gel. The order in induction time reflects the strength in counter-ion binding of X- to micelles. The stronger adsorbing X- would block the adsorption of silicate ions on micelles and delay the formation of the silica-surfactant mesophases. The order of the ion series agrees with the Hofmeister series in many lyotropic systems such as in ion-protein and ion-surfactant interactions, Surfactant chain length and the addition of I-alkanols affects the counterion adsorption behavior and they also have strong influences on the rate of formation of the silicate-surfactant mesophase. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:135 / 141
页数:7
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