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

    Fingerprint

    Gels
    gels
    oscillations
    Superconducting transition temperature
    Phase transitions
    transition temperature
    Polymers
    Metals
    catalysts
    self oscillation
    chemical energy
    Catalysts
    osmosis
    polymers
    Dehydration
    dehydration
    Hydration
    metals
    hydration
    interactions

    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

    Cite this

    Volume oscillation of microphase-separated gel. / Maeda, Shingo; Hashimoto, Shuji.

    In: Macromolecular Chemistry and Physics, Vol. 214, No. 3, 12.02.2013, p. 343-349.

    Research output: Contribution to journalArticle

    Maeda, Shingo ; Hashimoto, Shuji. / Volume oscillation of microphase-separated gel. In: Macromolecular Chemistry and Physics. 2013 ; Vol. 214, No. 3. pp. 343-349.
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