Evolution of Packing Parameters in the Structural Changes of Silica Mesoporous Crystals: Cage-Type, 2D Cylindrical, Bicontinuous Diamond and Gyroid, and Lamellar
Evolution of Packing Parameters in the Structural Changes of Silica Mesoporous Crystals: Cage-Type, 2D Cylindrical, Bicontinuous Diamond and Gyroid, and Lamellar
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DOI：
10.1021/ja200683t
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发表时间：
2011-08-03
影响因子：
15
通讯作者：
Che, Shunai
中科院分区：
文献类型：
--
作者：
Han, Lu;Miyasaka, Keiichi;Che, Shunai
在非离子表面活性剂C-16(EO)(10) （Brij-56）的存在下，以阴离子表面活性剂n -硬脂酰-L-谷氨酸（C(18)GluA）为模板，得到了笼型、二维（2D）圆柱形六角形(C)、双连续菱形(D)、双连续螺旋形(G)和一维（1D）片层状(L)硅介孔晶体（SMCs）。介观结构受Brij-56诱导的有机/无机界面曲率变化的控制。综合场图显示，随着Brij-56添加量的增加，笼型-> C -> C与D -> C与G -> D -> G -> L的介观结构发生了变化。阴离子表面活性剂和非离子表面活性剂可形成混合胶束，其填充参数g随非离子表面活性剂添加量的增加和反应温度的升高而增大。通过计算等静电势面平均曲率和高斯曲率，从电子晶体学重建结果中得到局域g参数。讨论了C与D的共生以及C与G的两种共生。
Cage-type, two-dimensional (2D) cylindrical hexagonal (C), bicontinuous diamond (D), bicontinuous gyroid (G), and one-dimensional (1D) lamellar (L) structures of silica mesoporous crystals (SMCs) were obtained by using the anionic surfactant N-stearoyl-L-glutamic acid (C(18)GluA) as a template in the presence of the nonionic surfactant C-16(EO)(10) (Brij-56). The mesostructures were controlled by the organic/inorganic interface curvature change induced by Brij-56. A synthesis-field diagram showed that the mesostructure changed in the sequence cage-type -> C -> intergrowth of C and D -> intergrowth of C and G -> D -> G -> L with increase of the amount of Brij-56. Mixed micelles were formed by the anionic and nonionic surfactants, the packing parameter g of which increased with increasing the addition amount of nonionic surfactant and the reaction temperature. The local g parameter was obtained from electron crystallography reconstruction results by calculating mean curvatures and Gaussian curvatures from the equi-electrostatic potential surface. The intergrowth of C and D and two kinds of intergrowth of C and G are also discussed.