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The effects of water on the dielectric properties of aluminum based nanocomposites

The effects of water on the dielectric properties of aluminum based nanocomposites
The effects of water on the dielectric properties of aluminum based nanocomposites
A series of polyethylene nanocomposites was prepared utilizing aluminum nitride or alumina nano-powders with comparable morphologies. These were subsequently subjected to different conditioning regimes, namely prolonged storage in vacuum, the ambient laboratory environment or in water. The effect of filler loading and conditioning (i.e. water content) on their morphological and dielectric properties was then examined. Measurements indicated that, in the case of aluminum nitride nanocomposites, none of the conditioning regimes led to significant absorption of water and, as such, neither the dielectric properties nor the DC conductivity varied. Conversely, the alumina nanocomposites were prone to the absorption of an appreciable mass of water, which resulted in them displaying a broad dielectric relaxation, which shifted to higher frequencies, and a higher DC electrical conductivity. We ascribe these different effects to the interfacial surface chemistry present in each system and, in particular, the propensity for hydrogen bonding with water molecules diffusing through the host matrix. Technologically, the use of nanocomposites based upon systems such as aluminum nitride, in place of the commonly used metal oxides (alumina, silica, etc.), eliminates variations in dielectric properties due to absorption of environmental water without resorting to the adoption of techniques such as surface functionalization or calcination in an attempt to render nanoparticle surface chemistry hydrophobic.
Dielectric spectroscopy, electrical conductivity, nanocomposutes, polyethylene, alumina, aluminum nitride
667-676
Hosier, Ian
6a44329e-b742-44de-afa7-073f80a78e26
Praeger, Matthew
84575f28-4530-4f89-9355-9c5b6acc6cac
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Swingler, Steven
4f13fbb2-7d2e-480a-8687-acea6a4ed735
Hosier, Ian
6a44329e-b742-44de-afa7-073f80a78e26
Praeger, Matthew
84575f28-4530-4f89-9355-9c5b6acc6cac
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Swingler, Steven
4f13fbb2-7d2e-480a-8687-acea6a4ed735

Hosier, Ian, Praeger, Matthew, Vaughan, Alun and Swingler, Steven (2017) The effects of water on the dielectric properties of aluminum based nanocomposites. IEEE Transactions on Nanotechnology, 16 (4), 667-676. (doi:10.1109/TNANO.2017.2703982).

Record type: Article

Abstract

A series of polyethylene nanocomposites was prepared utilizing aluminum nitride or alumina nano-powders with comparable morphologies. These were subsequently subjected to different conditioning regimes, namely prolonged storage in vacuum, the ambient laboratory environment or in water. The effect of filler loading and conditioning (i.e. water content) on their morphological and dielectric properties was then examined. Measurements indicated that, in the case of aluminum nitride nanocomposites, none of the conditioning regimes led to significant absorption of water and, as such, neither the dielectric properties nor the DC conductivity varied. Conversely, the alumina nanocomposites were prone to the absorption of an appreciable mass of water, which resulted in them displaying a broad dielectric relaxation, which shifted to higher frequencies, and a higher DC electrical conductivity. We ascribe these different effects to the interfacial surface chemistry present in each system and, in particular, the propensity for hydrogen bonding with water molecules diffusing through the host matrix. Technologically, the use of nanocomposites based upon systems such as aluminum nitride, in place of the commonly used metal oxides (alumina, silica, etc.), eliminates variations in dielectric properties due to absorption of environmental water without resorting to the adoption of techniques such as surface functionalization or calcination in an attempt to render nanoparticle surface chemistry hydrophobic.

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TNANO02703982-proofread version - Accepted Manuscript
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More information

Accepted/In Press date: 8 May 2017
e-pub ahead of print date: 12 May 2017
Published date: July 2017
Keywords: Dielectric spectroscopy, electrical conductivity, nanocomposutes, polyethylene, alumina, aluminum nitride
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 411012
URI: http://eprints.soton.ac.uk/id/eprint/411012
PURE UUID: b7c8c7d4-8b99-489d-acc7-c68845d3f9f3
ORCID for Ian Hosier: ORCID iD orcid.org/0000-0003-4365-9385
ORCID for Alun Vaughan: ORCID iD orcid.org/0000-0002-0535-513X

Catalogue record

Date deposited: 13 Jun 2017 16:31
Last modified: 03 Dec 2019 01:54

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