Concentric Circular Approach in Mesoporous Silica Transition Process from Hexagonal to Vesicular Structure  

作　　者：HUANG Jue XIE Shihang MU Mingwei PENG Ce CAO Mengjing YAO Youwei CAI Qiang 

机构地区：[1]School of Material Science and Engineering, Tsinghua University, Beijing 100084, P. R. China [2]Graduated School at Shenzhen, Tsinghua University, Shenzhen 518055, P. R. China [3]School of Material and Chemical Engineering, Hainan University, Haikou 570228, P. R. China

出　　处：《Chemical Research in Chinese Universities》2015年第6期904-908,共5页高等学校化学研究（英文版）

摘　　要：We studied the synthesis of mesoporous silica from cetyltrimethyl ammonium bromide（CTAB） and so- dium dodecyl sulfate（SDS） at different molar ratios（R）. X-ray diffraction（XRD）, scanning electron spectroscopy （SEM）, transmission electron spectroscopy（TEM） and nitrogen sorption analysis were then used to further investigate the internal relationship among different morphologies and structures, as well as the mechanism of the transition from hexagonal to vesicular structure. The results reveal that as R increased, a consistent and gradual transition occurred via a concentric circular secondary structure formed. The antagonistic effect between the decreasing curvature of surfactant micelle and increasing curvature of secondary structures may be the reason for the complex morphologies synthesized, and the increasing bending energy AGb is the main driving force for the transition.We studied the synthesis of mesoporous silica from cetyltrimethyl ammonium bromide（CTAB） and so- dium dodecyl sulfate（SDS） at different molar ratios（R）. X-ray diffraction（XRD）, scanning electron spectroscopy （SEM）, transmission electron spectroscopy（TEM） and nitrogen sorption analysis were then used to further investigate the internal relationship among different morphologies and structures, as well as the mechanism of the transition from hexagonal to vesicular structure. The results reveal that as R increased, a consistent and gradual transition occurred via a concentric circular secondary structure formed. The antagonistic effect between the decreasing curvature of surfactant micelle and increasing curvature of secondary structures may be the reason for the complex morphologies synthesized, and the increasing bending energy AGb is the main driving force for the transition.

关 键 词：Mesoporous material Cationic-anionic surfactant Structural transition SILICA SELF-ASSEMBLY 

分 类 号：O613.72[理学—无机化学] TQ460.4[理学—化学]