State Key Laboratory of Chemical Engineering and Department of Chemistry, East China University of Science and Technology, Shanghai 200237, China.
Langmuir. 2012 Feb 7;28(5):2950-9. doi: 10.1021/la204197a. Epub 2012 Jan 27.
A series of micro/mesoporous silica composites were synthesized with P123 and imidazolium ILs ([C(n)mim]X) as the co-templates. [C(n)mim]X showed notable synergic interaction with P123. By changing the alkyl chain length n in methylimidazolium, ring-like micropores were observed in the wall of the mesoporous materials when n = 4. While increasing n to 10, micropores and mesopores were found in different separated regions. Various anions of Cl(-), Br(-), and BF(4)(-) of ILs have little effect on the aggregation behavior of P123/C4X mixed micelles. The strong hydrogen bonding effect of BF(4)(-) has resulted in the ordered mesoporous channels with numerous micropores in the wall at a low temperature of 313 K. Hydrophobic C4PF(6) can only be solubilized in the core of P123 micelles, which resulted in the swelling of P123/C4PF(6) mixed aggregates and the ordered hexagonal porous silica materials at 313 K. The fundamental understanding of the synergic interaction and formation mechanisms of various porous silica materials can provide a general convenient way toward a rational design and synthesis of the micro/mesoporous composites.
一系列的介孔/微孔硅基复合材料是用 P123 和咪唑基 ILs([C(n)mim]X) 作为共模板合成的。[C(n)mim]X 与 P123 表现出显著的协同作用。通过改变甲基咪唑中的烷基链长 n，当 n = 4 时，介孔材料的壁中出现了环状微孔。而当 n 增加到 10 时，微孔和介孔出现在不同的分离区域。ILs 的各种阴离子 Cl(-)、Br(-)和 BF4(-)对 P123/C4X 混合胶束的聚集行为几乎没有影响。BF4(-)的强氢键效应导致在低温 313 K 下形成具有大量微孔的有序介孔通道。疏水性 C4PF6 只能溶解在 P123 胶束的核心中，这导致 P123/C4PF6 混合聚集体在 313 K 下发生溶胀，形成有序的六方多孔硅材料。对各种多孔硅材料协同作用和形成机制的深入了解，为合理设计和合成介孔/微孔复合材料提供了一种通用的简便方法。
