Development of Nano-reaction Supports Using Hierarchically Porous Structure

采用溶胶-凝胶反应相分离法制备了大孔分布明显的多孔硅胶。利用激光扫描共聚焦显微镜获得了一系列凝胶的薄片图像，并从中重建了凝胶的三维构型。在三维结构上，进行了统计处理，以提取孔隙和凝胶骨架的尺寸分布以及孔隙率，这是传统的间接方法测量的。对局部表面曲率的进一步分析给出了平均曲率和高斯曲率的信息，从而定量评价了大孔网络的几何特征。利用真实压降和模拟压降对孔隙度进行了液体流动行为的检测。

Porous silica gels having sharply distributed macropores were prepared by a sol-gel reaction accompanied by a phase separation. Laser scanning confocal microscopy was utilized to obtain a series of thin-sliced images of the gels, from which the three-dimensional configuration was reconstructed. On the three-dimensional configuration, a statistical processing has been performed to extract size distribution of pores and gel skeletons as well as porosity, which have been conventionally measured by indirect method. Additional analysis on local surface curvatures gave information on mean curvature and Gauss curvature, which lead to the quantitative evaluation of the geometrical features of macroporous network. Liquid flow behavior was examined using real and simulated pressure drops against porosity.