The role of curvature in silica mesoporous crystals
The role of curvature in silica mesoporous crystals
复制标题
DOI：
10.1098/rsfs.2011.0098
复制
发表时间：
2012-10
期刊：
影响因子：
4.4
通讯作者：
K. Miyasaka;Alfonso Garcia Bennett;Lu Han;Yu Han;C. Xiao;N. Fujita;Toen Castle;Y. Sakamoto;S. Che;O. Terasaki
中科院分区：
文献类型：
--
作者：
K. Miyasaka;Alfonso Garcia Bennett;Lu Han;Yu Han;C. Xiao;N. Fujita;Toen Castle;Y. Sakamoto;S. Che;O. Terasaki
二氧化硅介孔晶体（SMC）提供了一个独特的机会，研究胶束中间相。将非平衡中间相复制到多孔二氧化硅结构中允许在各种化学和物理扰动下表征表面活性剂相，通过液晶化学家通常无法获得的方法。一个尖锐的例子是使用电子显微镜和晶体学，如本文所讨论的，用于确定两亲曲率的基本作用，即平均曲率和高斯曲率，其已在各种领域如聚合物，液晶，生物膜等中被广泛研究。本工作旨在突出一些当前研究致力于SMC上的界面曲率，其中电子显微镜和电子晶体学（EC）用于通过静电势图的研究来理解双连续和笼型介观结构中二氧化硅壁表面的几何形状。此外，我们表明，通过改变SMC的制备过程中的合成条件，它是可能的胶束中间相转变过程中的立方双连续系统中的分离颗粒，使我们能够查看和研究特定的合成条件下的外延关系。通过使用电子显微镜和EC研究介孔结构，界面曲率和胶束中间相之间的关系，我们希望为这些独特材料的形成机制带来新的见解，同时也为理解周期性液晶系统提供了新的途径。
Silica mesoporous crystals (SMCs) offer a unique opportunity to study micellar mesophases. Replication of non-equilibrium mesophases into porous silica structures allows the characterization of surfactant phases under a variety of chemical and physical perturbations, through methods not typically accessible to liquid crystal chemists. A poignant example is the use of electron microscopy and crystallography, as discussed herein, for the purpose of determining the fundamental role of amphiphile curvature, namely mean curvature and Gaussian curvature, which have been extensively studied in various fields such as polymer, liquid crystal, biological membrane, etc. The present work aims to highlight some current studies devoted to the interface curvature on SMCs, in which electron microscopy and electron crystallography (EC) are used to understand the geometry of silica wall surface in bicontinuous and cage-type mesostructures through the investigation of electrostatic potential maps. Additionally, we show that by altering the synthesis conditions during the preparation of SMCs, it is possible to isolate particles during micellar mesophase transformations in the cubic bicontinuous system, allowing us to view and study epitaxial relations under the specific synthesis conditions. By studying the relationship between mesoporous structure, interface curvature and micellar mesophases using electron microscopy and EC, we hope to bring new insights into the formation mechanism of these unique materials but also contribute a new way of understanding periodic liquid crystal systems.