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 - Feb 7 2015

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

All Science Journal Classification (ASJC) codes

  • 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, S, Oda, Y, Shimojima, A, Okubo, T, Aoshima, S & Sugawara-Narutaki, A 2015, 'Ring assembly of silica nanospheres mediated by amphiphilic block copolymers with oxyethylene moieties', Polymer Journal, vol. 47, no. 2, pp. 128-135. https://doi.org/10.1038/pj.2014.115
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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