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Redox-Responsive Macroscopic Gel Assembly Based on Discrete Dual Interactions

Authors

  • Masaki Nakahata,

    1. Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560–0043 (Japan)
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  • Dr. Yoshinori Takashima,

    1. Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560–0043 (Japan)
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  • Prof. Dr. Akira Harada

    Corresponding author
    1. Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560–0043 (Japan)
    2. Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST) (Japan)
    • Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560–0043 (Japan)

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  • This research was supported by the CREST project, Japan Science and Technology Agency. M.N. appreciates a JSPS fellowship from MEXT of Japan. We thank Seiji Adachi and Naoya Inazumi (Osaka University) for their helpful advice on the measurement of FGMAS NMR spectra.

Abstract

The macroscopic self-assembly of polymeric hydrogels modified with β-cyclodextrin (βCD gel), ferrocene (Fc gel), and styrenesulfonic acid sodium salt (SSNa gel) was investigated. Under reductive conditions, the Fc gel selectively adhered to the βCD gel through a host–guest interaction. On the other hand, the oxidized ferrocenium (Fc+) gel selectively adhered to the SSNa gel through an ionic interaction under oxidative conditions. The adhesion strength was estimated by a tensile test. We finally succeeded in forming an ABC-type macroscopic assembly of all three gels through two discrete noncovalent interactions.

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