Effects of self-assembly process of latex spheres on the final topology of macroporous silica.
Effects of self-assembly process of latex spheres on the final topology of macroporous silica.
复制标题
乳胶球自组装过程对大孔二氧化硅最终拓扑结构的影响。
DOI：
10.1016/j.jcis.2005.05.016
复制
发表时间：
2005
影响因子：
9.9
通讯作者：
Y. Messaddeq
中科院分区：
文献类型：
--
作者：
D. B. Barros Filho;Cíntia Hisano;R. Bertholdo;M. G. Schiavetto;C. Santilli;S. Ribeiro;Y. Messaddeq
本文研究了乳胶模板法制备的亚微米（0.1-0.7 μm）大孔二氧化硅的拓扑结构。通过动态光散射（DLS）测量分析了乳胶球在水分散液中的行为，指出了形成良好定义的立方体阵列的最合适条件。乳胶球的光学行为进行了分析，通过透射率和反射率的测量，以确定其直径和填充因子时，他们组装在二维阵列。宏观模板已获得通过离心过程和它们的结晶有序已被证实孔隙率和扫描电子显微镜。这些自组装结构已被用于生产大孔二氧化硅，其最终拓扑结构取决于原始模板的孔径分布。已经看到，乳胶球是有序的，在一个主要的面心立方排列与滑动的四面体孔由于吸引静电相互作用的作用。其主要作用是将大孔二氧化硅中的球形空隙改变为六边形结构，从而可能应用于制备具有新光学特性的光子器件。
This paper surveys the topology of macroporous silica prepared using latex templates covering the submicrometric range (0.1–0.7 μm). The behavior of latex spheres in aqueous dispersion has been analyzed by dynamic light scattering (DLS) measurement indicating the most appropriate conditions to form well-defined cubic arrays. The optical behavior of latex spheres has been analyzed by transmittance and reflectance measurements in order to determine their diameter and filling factor when they were assembled in bidimensional arrays. Macroscopic templates have been obtained by a centrifugation process and their crystalline ordering has been confirmed by porosimetry and scanning electron microscopy. These self-assembled structures have been used to produce macroporous silica, whose final topology depends on the pore size distribution of the original template. It has been seen that latex spheres are ordered in a predominant fcc arrangement with slipping of tetragonal pores due to the action of attractive electrostatic interactions. The main effect is to change the spherical shape of voids in macroporous silica into a hexagonal configuration with possible applications to fabricate photonic devices with novel optical properties.