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|Title:||Internal Charge Behaviour of Nanocomposites.|
|Authors:||Nelson, J. Keith|
Fothergill, John C.
|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.|
|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 http://www.iop.org/. Doi: 10.1088/0957-4484/15/5/032.
|Appears in Collections:||Published Articles, Dept. of Engineering|
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