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Helical Pore Alignment on Cylindrical Carbon
Authors:Jun Maruyama  Tsutomu Shinagawa  Mitsuru Watanabe  Yukiyasu Kashiwagi  Shohei Maruyama  Toru Nagaoka  Wakana Matsuda  Yusuke Tsutsui  Shu Seki  Hiroshi Uyama
Abstract:Interest in chiral substances has mainly focused on the substances themselves, but not on the accompanying space, especially regarding the pore alignment. As a method to form both the chiral substance and the accompanying space, cylindrical self‐assembly of uniform polystyrene nanoparticles with fructose is carried out in the presence of both carbon and sodium alginate, which is followed by heat treatment in an inert atmosphere. The carbonization generates fructose‐derived honeycomb‐like carbon walls with helically aligned nanopores left after the polystyrene decomposition. The diffuse reflectance circular dichroism measurements give peaks with opposite signs for the d ‐ and l ‐fructose‐derived cylindrical carbons. Circularly polarized light sensitivity in transient photoconductivity is confirmed apparently in the carbon‐based helical structures. This sensitivity as well as straightforward formation of composites with another component to give helicity shows potential applications of the helically aligned pores.
Keywords:carbon materials  chirality  circular dichroism  mesoporous materials  self‐assembly
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