Construction of Silica-Based Ordered Nanostructured Materials from Precisely Designed Building Units

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Ordered silica-based nanostructured materials have been synthesized by the self-organization of precisely designed building units. Silica, one of the most abundant materials on the earth, is excellent for the applications including adsorption, catalysis, and so on. Hybridization of silica-based materials and organic substances is an important issue in materials chemistry. We have focused on the formation of nanostructures by the self-organization of hybrid molecules having both inorganic and organic parts within the structures, and studied the relations between the structures of the starting materials and the functions of the products. In particular, macroscopic structural control utilizing both a confined space and anisotropy of interface was investigated.The accomplishment of this research project consists of four parts as follows : 1) The formation of multilayered hybrid films from organoalkoxysilanes with polymerizable functional groups and the patterning by photolithography techni … More que, 2) the investigation of the self-assembly behavior of amphiphilic siloxane oligomers in a confined space and the design of hierarchical structures, 3) the synthesis of uniaxially aligned mesoporous organosilica films with optical functional groups in the pore walls and the characterization of the optical properties, and 4) the synthesis of mesoporous silica by using a precisely designed polymer template and immobilization of the template onto the pore wall surface. The researches of 1-3) are based on the use of novel amphiphilic siloxane-based molecules and the bridged-organoalkoxysilane as the starting materials. These precisely designed building units were utilized with macroscopic techniques to control the hierarchical structures and the alignment of nanostructures. The research 4) has shown the novel template polymer of mesoporous silica designed to be immobilized in a silica wall as a modifier molecule.We have succeeded in controlling the structures and the functions in detail by the precise design of starting molecules. A novel field on the controls of both hierarchical structures and alignment of silica-based nanomaterials has been developed by applying macroscopically controlled techniques. Less