Abstract
In this study, we clarified the effect of dip-coating rates on the film thickness and pore alignment of SBA-15 mesoporous silica thin films. It is known that film thickness increases with increasing the dip-coating rate, and film thickness also increases with decreasing the dip-coating rate to the ultraslow region where the capillary rise of the solution occurs on the dried film. Detail analysis of the synthesized thin films clarified that the pore diameter and interpore distance also depended on the dip-coating rate. This result suggests that the film thickness and pore alignment can be controlled without changing the physical-chemical properties of silica solutions and the size of template molecules, and thus the heterogeneous thin films can be synthesized by a dip-coating method with variable withdraw speeds.
