Alignment of polymer based magnetic composites in magnetic field

•The magnetic field applied to samples during film formation strongly affects morphology and electric properties of films.•GNP covered with magnetite nanoparticles tend to align along the magnetic field and form more porous structure.•Thin films formed without (with) magnetic field have activation c...

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Bibliographic Details
Published in:Progress in organic coatings 2019-12, Vol.137, p.105366, Article 105366
Main Authors: Kukhta, A.V., Kuzhir, P.P., Maksimenko, S.A., Vorobyova, S.A., Kukhta, I.N., Pochtenny, A.E., Taoubi, M.I., Bistarelli, S., Bellucci, S.
Format: Article
Language:English
Subjects:
Alignment
Fe3O4
GNP
Graphene
Iron oxides
Magnetic fields
Magnetism
Morphology
Nanocomposites
Nanoparticles
PEDOT:PSS
Polymer films
Polymer matrix composites
Strong interactions (field theory)
Thin films
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Description
Summary:•The magnetic field applied to samples during film formation strongly affects morphology and electric properties of films.•GNP covered with magnetite nanoparticles tend to align along the magnetic field and form more porous structure.•Thin films formed without (with) magnetic field have activation character of conductivity (of metallic conductivity).•Possible mechanisms of the above transformations in forming films without and with magnetic field are discussed. Composite films made of graphene nanoplatelets (GNP) and magnetite Fe3O4 nanoparticles have been prepared with and without magnetic field. Poly(3,4-ethylenedioxythiophene):polystyrenesulfonic acid (PEDOT:PSS) was used as a stabilizing polymer matrix. Film morphology was found to depend strongly on the presence of magnetic field, i.e. more porous structure of GNP- Fe3O4 is formed in magnetic field. Thin films formed without magnetic field have activation character of conductivity, while thin films formed in magnetic field have metallic conductivity. Thus, the magnetic field acting during film formation in these composites results in semiconductor-metal transition. DFT calculations show that at low distance between GNP surface and nanoparticle strong interaction between them can be observed.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2019.105366