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Ordering Polymer‐Grafted Nanoparticles at Oil–Air Interfaces under Magnetic Fields
Author(s) -
Liu Siqi,
Wang Haoyu,
Akcora Pinar
Publication year - 2018
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201800012
Subject(s) - nanoparticle , materials science , anisotropy , polymer , grafting , monolayer , magnetic nanoparticles , magnetic field , chemical physics , voronoi diagram , particle (ecology) , chemical engineering , polymer chemistry , nanotechnology , chemistry , composite material , geometry , physics , optics , mathematics , oceanography , engineering , quantum mechanics , geology
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.