Ordering Polymer-Grafted Nanoparticles at Oil–Air Interfaces under Magnetic Fields

Siqi Liu, Haoyu Wang, Pinar Akcora

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Polymer-grafted magnetic nanoparticles at oil–air interfaces are examined to reveal the role of chain length and anisotropy on particle packing order in thin films. It is found that particles grafted with intermediate chain lengths and sparse grafting densities exhibit enhanced packing order with increasing magnetic field strength. Voronoi tessellation results present an increase in the cell area distribution of these samples, suggesting that chain conformations are affected. For the longest graft length, particles become more disordered under magnetic fields. It is proposed that fluctuations in the bridged chains rearrange particles into less ordered packing with field application and the mechanism of packing order differs for varying graft chain lengths. Grafting anisotropy is found to determine the spatial nanoparticle organization in assembled monolayers.

Original languageEnglish
Article number1800012
JournalMacromolecular Chemistry and Physics
Volume219
Issue number11
DOIs
StatePublished - Jun 2018

Keywords

  • anisotropy
  • interfaces
  • monolayers
  • packing order
  • polymer-grafted nanoparticles

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