日本ゼオライト学会　刊行物 Publication of Japan Zeolite Association

Mesoporous silica films with fully aligned tubular mesochannels were prepared using substrates with surface structural anisotropy. A series of experiments on mesoporous silica film formation onto single crystal silicon substrates proved that the mesochannels orientation was dependent on the crystal orientation of silicon substrate, and a mesoporous silica film with aligned mesochannel was prepared on Si (110) substrate. The mesochannels were aligned along ‹001› axis on (110) surface, and it was considered that the highly anisotropic atomic arrangement on the surface controls the alignment. A polymide coating with rubbing-treatment afforded the formation of mesoporous silica films with highly aligned channel structure on a glass substrate. The direction of the mesochannel alignment in the films was perpendicular to the rubbing direction.

It was considered that the formation of aligned hemi-cylindrical micelles on the substrate surface through hydrophobic interactions between the aligned polymer chains and the surfactant tail groups leads to the uniaxial alignment of mesochannels. The size of the mesochannels in the films was successfully enlarged using non-ionic surfactants keeping the narrow alignment distribution.