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research article

Graded-permittivity polymer nanocomposites as superior dielectrics

Nardi, Tommaso  
•
Mora, Nicolas  
•
Rachidi, Farhad  
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2016
Composites Science and Technology

Materials exhibiting a gradient in permittivity are synthesized through the application of an external magnetic field to a suspension of Fe3O4@TiO2 nanoparticles in an epoxy matrix. It is shown how the application of the magnetic field not only induces the magnetophoretic motion of the particles, but causes also their alignment in high aspect ratio structures. The combination of these two effects gives rise to graded nanocomposites exhibiting gradients in permittivity that go beyond the ones predicted for nanocomposites with homogeneously distributed and isotropic inclusions. Moreover, it is demonstrated through numerical simulations how such nanocomposites, employed as electrical insulators, can efficiently reduce the electrical field stress at the interface between the electrode and the insulator, being therefore suitable candidates as long-lasting high-voltage dielectrics. (C) 2016 Elsevier Ltd. All rights reserved.

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Type
research article
DOI
10.1016/j.compscitech.2016.04.010
Web of Science ID

WOS:000377840100001

Author(s)
Nardi, Tommaso  
•
Mora, Nicolas  
•
Rachidi, Farhad  
•
Leterrier, Yves  
Date Issued

2016

Publisher

Elsevier

Published in
Composites Science and Technology
Volume

129

Start page

1

End page

9

Subjects

Electrical properties

•

Functional composites

•

Nano particles

Peer reviewed

NON-REVIEWED

Written at

EPFL

EPFL units
SCI-STI-FR  
LTC  
Available on Infoscience
April 28, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/125957
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