Block Copolymer Micelle Nanotubes by the Solvent-Annealing-Induced Nanowetting in Anodic Aluminum Oxide Templates

I. Chun Yao, Ming Hsiang Cheng, Jiun-Tai Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Block copolymer micelles are generally formed by the self-assembly of amphiphilic copolymer molecules in aqueous medium. Although different types of block copolymer micelles have been studied, the self-assembly behavior of block copolymer micelles in confined geometries have been rarely studied. In this work, the fabrication of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) micelle nanotubes in the cylindrical nanopores of anodic aluminum oxide templates using a solvent-annealing-assisted wetting method is presented. The PS-b-P4VP chains wet the pore walls in the form of micelles when the sample is annealed in the vapor of toluene, a good solvent for PS and a nonsolvent for P4VP. The formation of the PS-b-P4VP micelle nanotubes instead of nanorods implies that the micelles wet the nanopores in the complete wetting regime. This study not only contributes to a deeper understanding of the self-assembly behavior of block polymer micelles in confined geometries, but also provides more possible variations and design freedoms in the application of block copolymer micelles. Polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) micelle nanotubes are prepared in the cylindrical nanopores of anodic aluminum oxide templates using a solvent-annealing-assisted wetting method. The PS-b-P4VP chains wet the pore walls in the form of micelles when the sample is annealed in toluene vapor. The formation of the PS-b-P4VP micelle nanotubes implies that the micelles wet the nanopores in the complete wetting regime.

Original languageEnglish
Pages (from-to)2154-2160
Number of pages7
JournalMacromolecular Chemistry and Physics
Volume216
Issue number22
DOIs
StatePublished - 1 Nov 2015

Keywords

  • anodic aluminum oxide (AAO)
  • block copolymers
  • micelles
  • nanotubes
  • solvent annealing

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