Magnetic field-induced self-assembly of conjugated block copolymers and nanoparticles at the air−water interface

So Jung Park, Minkyeong Park, Seulki Kang, Chongyong Nam, Karnati Narasimha, Won Bo Lee

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Here, we report the magnetic field-induced self-assembly of a conjugated block copolymer, poly(3-hexylthiopene)block-poly(ethylene glycol) (P3HT-b-PEG), and iron oxide nanoparticles (IONPs) at the air−water interface. Binary self-assembly of P3HT-b-PEG and IONPs at the interface results in nanoparticle-embedded P3HT-b-PEG nanowire arrays with a micrometer-scale domain size. Under the magnetic field, the field-induced magnetic interaction significantly improves the degree of order, generating long-range ordered, direction-controlled nanoarrays of P3HT-b-PEG and IONPs, where IONPs are aligned in the direction of the magnetic field over a sub-millimeter scale. The size of IONPs is an important factor for the formation of an ordered assembly structure at the nanometer scale, as it dictates the magnetic dipole interaction and the entropic interaction between nanoparticles and polymers. The consideration of magnetic dipole interactions suggests that the field-induced self-assembly occurs through the formation of intermediate magnetic subunits composed of short IONP strings along the semirigid P3HT nanowires, which can be aligned through the magnetic interactions, ultimately driving the long-range ordered self-assembly. This study demonstrates for the first time that the magnetic field-induced self-assembly can be used to generate macroscopically ordered polymer films with a nanometer-scale order in low fields.

Original languageEnglish
Pages (from-to)8266-8273
Number of pages8
JournalACS Applied Materials and Interfaces
Volume14
Issue number6
DOIs
StatePublished - 16 Feb 2022

Keywords

  • Conjugated block copolymers
  • Interface
  • Magnetic field
  • Magnetic nanoparticles
  • Nanoarray
  • Self-assembly

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