Ring assembly of silica nanospheres mediated by amphiphilic block copolymers with oxyethylene moieties

Shujun Zhou, Yukari Oda, Atsushi Shimojima, Tatsuya Okubo, Sadahito Aoshima, Ayae Sugawara-Narutaki

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Silica nanospheres (SNSs) of ca. 15 nm in diameter assemble into nanoring structures with the aid of amphiphilic block copolymers containing the oxyethylene side chains poly[(2-ethoxyethyl vinyl ether)-block-(2-methoxyethyl vinyl ether)] [poly(EOVE-b-MOVE)]. Cryo-transmission electron microscope observation confirms that the ring assembly of SNSs occurs in the liquid phase. The SNSs favorably assemble into ring-like nanostructures in the presence of 1-2 wt% EOVE100-b-MOVE310 at pH ∼7.8 and 45 °C. Irregular aggregates of SNSs form at 60 °C, most likely because of the hydrophobic collapse of the thermoresponsive block copolymer. A series of poly(EOVE-b-MOVE) with varying block lengths successfully induce the ring assembly of SNSs, whereas a random copolymer fails, indicating that the polymer's molecular structure critically affects the assembly mode of SNSs. Interestingly, SNSs of a larger size (ca. 30 nm) assemble one-dimensionally into chain-like nanostructures in the presence of EOVE100-b-MOVE310.

    Original languageEnglish
    Pages (from-to)128-135
    Number of pages8
    JournalPolymer Journal
    Volume47
    Issue number2
    DOIs
    Publication statusPublished - 2015 Feb 7

    Fingerprint

    Nanospheres
    Silicon Dioxide
    Block copolymers
    Silica
    Ethers
    Nanostructures
    Nanorings
    Molecular structure
    Polymers
    Electron microscopes
    Copolymers
    Liquids

    ASJC Scopus subject areas

    • Polymers and Plastics
    • Materials Chemistry

    Cite this

    Ring assembly of silica nanospheres mediated by amphiphilic block copolymers with oxyethylene moieties. / Zhou, Shujun; Oda, Yukari; Shimojima, Atsushi; Okubo, Tatsuya; Aoshima, Sadahito; Sugawara-Narutaki, Ayae.

    In: Polymer Journal, Vol. 47, No. 2, 07.02.2015, p. 128-135.

    Research output: Contribution to journalArticle

    Zhou, Shujun ; Oda, Yukari ; Shimojima, Atsushi ; Okubo, Tatsuya ; Aoshima, Sadahito ; Sugawara-Narutaki, Ayae. / Ring assembly of silica nanospheres mediated by amphiphilic block copolymers with oxyethylene moieties. In: Polymer Journal. 2015 ; Vol. 47, No. 2. pp. 128-135.
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    abstract = "Silica nanospheres (SNSs) of ca. 15 nm in diameter assemble into nanoring structures with the aid of amphiphilic block copolymers containing the oxyethylene side chains poly[(2-ethoxyethyl vinyl ether)-block-(2-methoxyethyl vinyl ether)] [poly(EOVE-b-MOVE)]. Cryo-transmission electron microscope observation confirms that the ring assembly of SNSs occurs in the liquid phase. The SNSs favorably assemble into ring-like nanostructures in the presence of 1-2 wt{\%} EOVE100-b-MOVE310 at pH ∼7.8 and 45 °C. Irregular aggregates of SNSs form at 60 °C, most likely because of the hydrophobic collapse of the thermoresponsive block copolymer. A series of poly(EOVE-b-MOVE) with varying block lengths successfully induce the ring assembly of SNSs, whereas a random copolymer fails, indicating that the polymer's molecular structure critically affects the assembly mode of SNSs. Interestingly, SNSs of a larger size (ca. 30 nm) assemble one-dimensionally into chain-like nanostructures in the presence of EOVE100-b-MOVE310.",
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    AU - Aoshima, Sadahito

    AU - Sugawara-Narutaki, Ayae

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