Graded-permittivity polymer nanocomposites as superior dielectrics
Source abstract
Abstract
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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Dielectric materials and actuators · Polymer Nanocomposites and Properties · Electromagnetic wave absorption materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (22)
Show source-provided references
1. Aging and related phenomena in modern electric power systems10.1109/14.237744 ↗
2. Fabrication of permittivity graded materials for reducing electric stress on electrode surface
3. Application of functionally graded material for reducing electric field on electrode and spacer interface10.1109/TDEI.2010.5412025 ↗
4. A novel synthetic strategy for bioinspired functionally graded nanocomposites employing magnetic field gradients10.1039/c3ra46731g ↗
5. Bioinspired functionally graded nanocomposites synthesized through magnetophoretic processes for tailored stress reduction
6. Stress reduction mechanisms during photopolymerization of functionally graded polymer nanocomposite coatings10.1016/j.porgcoat.2015.06.004 ↗
7. Synthesis and characterization of ultra–small superparamagnetic iron oxide nanoparticles thinly coated with silica10.1088/0957-4484/19/33/335601 ↗
8. Fe2O3@BaTiO3 core–shell particles as reactive precursors for the preparation of multifunctional composites containing different magnetic phases10.1021/cm1011982 ↗
9. Infrared spectroscopy of titania sol–gel coatings on 316L stainless steel
10. Cullity · 2009
11. Nardi · 2015
12. Crystallization process and magnetic properties of amorphous iron oxide nanoparticles10.1088/0022-3727/44/34/345002 ↗
13. Influence of anatase-rutile phase transformation on dielectric of sol-gel derived TiO2 thin film10.1007/s10832-006-9895-z ↗
14. Frequency and temperature dependent dielectric response of Fe3O4 nano-crystallites10.3329/jsr.v6i3.17938 ↗
15. Biomimetic micropatterning of titanium dioxide thin films for gate dielectrics10.5188/ijsmer.10.49 ↗
16. Colours in metal glasses and metal films
17. Berechnung verschiedener physikalischer konstanten von heterogenen substanzen. I. Dielektrizitätskonstanten und leitfähaigkeiten der mischkörper aus isotropen substanzen10.1002/andp.19354160705 ↗
18. Modeling the permittivity of composite materials with general effective medium equation10.1163/156939392X01660 ↗
19. Exploring the universal nature of electrical percolation exponents by genetic algorithm fitting with general effective medium theory10.1088/0022-3727/35/23/314 ↗
20. Engineering of composite media for shields at microwave frequencies
21. Power absorption of near field of elementary radiators in proximity of a composite layer
22. Effective permittivity of periodic composite materials: numerical modeling by the finite element method10.1016/j.elstat.2012.05.007 ↗