Spray-Coating Magnetic Thin Hybrid Films of PS-b-PNIPAM and Magnetite Nanoparticles

Senlin Xia, Lin Song, Nuri Hohn, Kun Wang, Sebastian Grott, Matthias Opel, Matthias Schwartzkopf, Stephan V. Roth, Peter Müller-Buschbaum

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Spray coating is employed to fabricate magnetic thin films composed of the diblock copolymer polystyrene-block-poly(N-isopropylacrylamide) and Fe 3 O 4 magnetic nanoparticles (MNPs) functionalized with hydrophobic coatings. The kinetics of structure formation of the hybrid films is followed in situ with grazing incidence small angle X-ray scattering during the spray deposition. To gain a better understanding of the influence of MNPs on the overall structure formation, the pure polymer film is also deposited as a reference via an identical spray protocol. At the initial spraying stage, the hybrid film (containing 2 wt% of MNPs) exhibits a faster formation process of a complete film as compared to the reference. The existence of MNPs depresses the dewetting behavior of polymer films on the substrate at macroscale and simultaneously alters the polymer microphase separation structure orientation from parallel to vertical. As spraying proceeds, MNPs aggregate into agglomerates with increasing sizes. After the spray deposition is finished, both samples gradually reach an equilibrium state and magnetic films with stable structures are achieved in the end. Superconducting quantum interference device investigation reveals the superparamagnetic property of the sprayed hybrid film. Consequently, potential application of sprayed films in fields such as magnetic sensors or data storage appears highly promising.

Original languageEnglish
Article number1808427
JournalAdvanced Functional Materials
Volume29
Issue number15
DOIs
StatePublished - 11 Apr 2019

Keywords

  • diblock copolymer
  • in situ GISAXS
  • magnetic nanoparticles
  • spray coating
  • superparamagnetism

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