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Liquid-Crystalline Polymer and Block Copolymer Domain Alignment Controlled by Free-Surface Segregation

Authors

  • Kei Fukuhara,

    1. Department of Molecular Design and Engineering Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603 (Japan)
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  • Yasuyoshi Fujii,

    1. Optical Materials Group Yokkaichi Research Laboratory, Tosoh Corporation, Kasumi, Yokkaichi 510-8540 (Japan)
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  • Yuki Nagashima,

    1. Department of Molecular Design and Engineering Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603 (Japan)
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  • Dr. Mitsuo Hara,

    1. Department of Molecular Design and Engineering Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603 (Japan)
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  • Prof. Shusaku Nagano,

    Corresponding author
    1. Nagoya University Venture Business Laboratory, Precursory Research for Embryonic Science and Technology (PRESTO)
    • Shusaku Nagano, Nagoya University Venture Business Laboratory, Precursory Research for Embryonic Science and Technology (PRESTO)

      Takahiro Seki, Department of Molecular Design and Engineering Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603 (Japan)

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  • Prof. Takahiro Seki

    Corresponding author
    1. Department of Molecular Design and Engineering Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603 (Japan)
    • Shusaku Nagano, Nagoya University Venture Business Laboratory, Precursory Research for Embryonic Science and Technology (PRESTO)

      Takahiro Seki, Department of Molecular Design and Engineering Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8603 (Japan)

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  • This work was supported by a Grant-in-Aid for Basic Scientific Research S (23225003), the Global COE program, the Program for Leading Graduate Schools from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), and the JST-PRESTO program (Japan). The synchrotron X-ray scattering experiments were performed at the BL-15A in the KEK-Photon Factory, Tsukuba (proposal No. 2012G629).

Abstract

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An orientational change from homeotropic to planar of liquid crystal (LC) mesogens and the microphase separation (MPS) domains is attained by the segregated skin layer at the free surface. This allows for an efficient in-plane photoalignment of the cylindrical domains. The surface segregation strategy is very simple and is therefore expected to open up new possibilities for the orientation control of various types of LC materials.

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