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Title: Internal Charge Behaviour of Nanocomposites.
Authors: Nelson, J. Keith
Fothergill, John C.
First Published: May-2004
Publisher: Institute of Physics
Citation: Nanotechnology, 2004, 15 (5), pp. 586-595.
Abstract: The incorporation of 23 nm titanium dioxide nanoparticles into an epoxy matrix to form a nanocomposite structure is described. It is shown that the use of nanometric particles results in a substantial change in the behaviour of the composite, which can be traced to the mitigation of internal charge when a comparison is made with conventional TiO2 fillers. A variety of diagnostic techniques (including dielectric spectroscopy, electroluminescence, thermally stimulated current, photoluminescence) have been used to augment pulsed electro-acoustic space charge measurement to provide a basis for understanding the underlying physics of the phenomenon. It would appear that, when the size of the inclusions becomes small enough, they act co-operatively with the host structure and cease to exhibit interfacial properties leading to Maxwell-Wagner polarization. It is postulated that the particles are surrounded by high charge concentrations in the Gouy-Chapman-Stern layer. Since nanoparticles have very high specific areas, these regions allow limited charge percolation through nano-filled dielectrics. The practical consequences of this have also been explored in terms of the electric strength exhibited. It would appear that there was a window in which real advantages accrue from the nano-formulated material. An optimum loading of about 10% (by weight) is indicated.
DOI Link: 10.1088/0957-4484/15/5/032
ISSN: 0957-4484
Version: Post print
Status: Peer reviewed
Type: Article
Rights: © 2004 IOP Publishing Ltd. Deposited with reference to the publisher's archiving policy available on the SHERPA/RoMEO website.
This is the author's final draft of the paper published as Nanotechnology, 2004, 15 (5), pp. 586-595. The final version is available from Doi: 10.1088/0957-4484/15/5/032.
Appears in Collections:Published Articles, Dept. of Engineering

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