Photo-orientation of Mesoporous Silica Thin Films on Photocrosslinkable Polymer Films


  • We thank Dr. T. Hikage of the High-Intensity X-ray Diffraction Laboratory, Graduate School of Engineering, Nagoya University for the in-plane XRD measurements. This work was supported by Grants-in-Aid for Scientific Research (No. 16205019 and No. 417 for the Priority Areas) from The Ministry of Education, Culture, Sports, Science, and Technology, Japan, and the Asahi Science Foundation.


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A photocrosslinkable polymer liquid crystal (PPLC) can be used to form aligned mesoporous silica thin films. Crosslinking the biphenyl mesogens with linearly polarized UV light results in a photo-oriented film whose orientational order is subsequently increased by annealing. Addition of a precursor sol produces high-quality silica films (see Figure) which can be used for optical devices that incorporate functional dyes or metal clusters into the channels.