Volume oscillation of microphase-separated gel

Shingo Maeda, Shuji Hashimoto

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    In this study, The volume oscillation of the microphase-separated, self-oscillating gel above the volume phase transition temperature is discussed. The self-oscillating gel is composed of N-isopropylacrylamide (NIPAAm) with a metal catalyst for the Belousov-Zhabotinsky (BZ) reaction, which is known as the oscillating reaction. The influence of temperature on the period and the self-oscillating behavior is clarified. The volume change of the gel is explained by a change of the Flory-Huggins interaction parameter, χ, which is induced by the hydration and dehydration of the polymer chain due to a valance change of the metal catalyst (Ru(bpy)3 2+ ↔ Ru(bpy)3 3+) below the volume phase-transition temperature. In contrast, the volume change of the gel is explained by a change of the Donnan osmotic pressure. The volume oscillation of a microphaseseparated gel above the volume phase transition temperature is discussed. The oscillating motion is produced by the dissipating chemical energy of the oscillating reaction, that is, the Belouzov-Zhabotinsky (BZ) reaction occuring inside the gel. Although the gel is completely composed of synthetic polymer, it shows a self-oscillation as if it is alive.

    Original languageEnglish
    Pages (from-to)343-349
    Number of pages7
    JournalMacromolecular Chemistry and Physics
    Volume214
    Issue number3
    DOIs
    Publication statusPublished - 2013 Feb 12

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    Keywords

    • biomimetics
    • crosslinking
    • gels
    • phase separation
    • stimuli-sensitive polymers

    ASJC Scopus subject areas

    • Materials Chemistry
    • Polymers and Plastics
    • Organic Chemistry
    • Physical and Theoretical Chemistry
    • Condensed Matter Physics

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