Presentation Information
[8a-PB2-29]Fabrication of nanoporous thin films with ion-selective nanochannels using liquid crystalline block copolymers
〇Yuma Takahashi1, Yuya Ishizaki2, Shusaku Nagano1 (1.Rikkyo Univ., 2.Shinshu Univ.)
Keywords:
Liquid crystalline block copolymer,Microphase separation structure,Nanoporous film
Liquid crystalline block copolymers, PAz-b-PPOSS, containing azobenzene (Az) and polyhedral oligomeric silsesquioxane (POSS) side-chains were synthesized by reversible addition– fragmentation chain transfer (RAFT) polymerization. PAz-b-PPOSS formed microphase-separated cylinders of LC Az. A vertically aligned LC cylinder structure in the PAz-b-PPOSS thin films was induced by unpolarized visible light (430 nm) irradiation at 80 °C for 90 min.[SN1] Subsequent oxidative ashing of these vertically aligned films successfully fabricated through-plane nanoporous silica thin films. The surface morphologies of the porous films supported the through-plane films. The cyclic voltammetry (CV) measurements revealed that redox reactions occurred only in metal cation solutions, indicating cation selectivity and confirming the formation of through-plane nanochannels penetrating from the film surface to the substrate.