Formation mechanism of nano- and meso-scale integrated ordered structure using molecular assemblies as template

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1. Formation mechanism of nano-size unit structure1-1 Formation mechanism of nano-size silica structureVarious morphologies of microstructure were synthesized by pH variation in silica nano-structure formation by templating mechanism in laurylamine hydrochloride/tetraethoxysilane system. Integrated ordered structure such as hexagonal array was formed in the narrow pH region from 10 to 11.5.1-2 Formation mechanism of titania anotubesHighly photocatalytic single crystalline anatase titania nanotubes can be synthesized by templating mechanism in laurylamine hydrochloride/tetraisopropylorthotitanate modified with acetylacetone. Titania nanotubes were synthesized as amorphous phase and were crystallized in the rection process at 80 ℃ for 3days. The pore-size became large with proceeding crystallization.2. Elucidation of formation mechanism of the integrated ordered structure of silica Liquid-liquid interface between the organic and aqueous phases played an essential role for the formation of integrated ordered structure of silica at pH 10 to 11.5. The formation processes of integrated ordered structure in a few minutes at pH 10.5 were measured in every second by small angle X-ray scattering using syncrotron orbit radiation high power X-ray at SPring 8. We found that independent cylinders were formed first at the liquid-liquid interface and gathered with each other on the two-dimensional space of the interface to make an two- and three-dimensional integrated ordered structure.