High- and low-field dielectric characteristics of dielectrophoretically aligned ceramic/polymer nanocomposites

Tomer, V.; Randall, Clive A.; Polizos, Georgios; Kostelnick, J.; Manias, Evangelos

doi:10.1063/1.2838481

Cited by 93 publications

(77 citation statements)

References 23 publications

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“…This shows that the addition of nano-TiO 2 can inhibit the injection of the space charges, and the effect of inhibition increases with increasing nano-TiO 2 content. This result is consistent with other studies that showed that nanoparticles are used to improve organic polymers (Tian et al 2011;Tomer et al 2008). 6.67×10…”

Section: Resultssupporting

confidence: 82%

Space Charge Behavior in Oil-Impregnated Insulation Paper Reinforced with Nano-TiO2

Liao¹,

Lv²,

Yang³

et al. 2013

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a Oil-impregnated insulation paper is widely used in power transformers, and the insulation properties of oil-impregnated insulation paper play an important role in the reliability of power equipment. The formation and dynamics of space charge can affect the performance of insulation material. However, methods to improve the space charge distribution in oil-impregnated insulation paper are rarely reported. In this paper, space charge behavior in oil-impregnated insulation paper has been investigated using the pulsed electro-acoustic (PEA) technique. A series of measurements was applied when the oil-impregnated insulation paper reinforced with different nano-TiO 2 contents was subjected to various electric field strengths. The accumulation and decay of space charge are discussed, and the internal electric field strength distribution of oilimpregnated insulation paper is analyzed. The test results show that the space charge distribution is improved and the distortion rate of the internal electric field strength is reduced by adding nano-TiO 2 to the oilimpregnated insulation paper. The results show that the proposed method offers a new way to improve the properties of oil-impregnated insulation paper.

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Section: Resultssupporting

confidence: 82%

Space Charge Behavior in Oil-Impregnated Insulation Paper Reinforced with Nano-TiO2

Liao¹,

Lv²,

Yang³

et al. 2013

BioResources

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“…[19][20][21][22][23][24] When an electric field is applied to an uncured thermosetting polymer, the dispersed particles form chains, which are fixed in place when the matrix is cured. Several studies reporting an increase in the permittivity of a composite material in the direction of these chains have been published, [25][26][27][28][29] However, the effect of the dielectrophoretic alignment on the piezoelectric properties, such as d 33 and g 33 , of piezoelectric particle-polymer matrix composites has not been explored yet, with the exception of one preliminary study. 30 In this paper, the effect of several key processing parameters on these piezoelectric properties and a quantitative coupling of these properties to the structured composites are investigated.…”

Section: Introductionmentioning

confidence: 99%

Improving the d33 and g33 properties of 0-3 piezoelectric composites by dielectrophoresis

Ende

Bory

Groen

et al. 2010

Journal of Applied Physics

139

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Composites of piezoelectric particles in a polymer matrix with enhanced properties in the poling direction were prepared by dielectrophoretic alignment of the particles. The effect of processing parameters such as the amplitude and frequency of the applied electric field and the viscosity of the matrix on the dielectric and piezoelectric properties of the cured composite were demonstrated for a composite with a PZT volume fraction of 0.2. The amount of structuring could be correlated to the dielectric and piezoelectric properties of the composite through the P 2 order parameter for the average particle chain orientation, which was derived from image analysis of the microstructure. The piezoelectric properties of the aligned composites can be described with a new model for composites containing particles arranged into chains. The model predictions are in good agreement with the experimental results.

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“…2,3 Several potential applications have been proposed, such as temperature sensors, 4 dielectrics for embedded capacitors, 3,5 and piezoelectric elements for energy harvesting. 6 It has been shown recently that the alignment of PZT equiaxed granulate particles in an epoxy resin results in an improvement of the piezoelectric properties over 0-3 composites with randomly dispersed particles.…”

Section: Introductionmentioning

confidence: 99%

Dielectrophoretically structured piezoelectric composites with high aspect ratio piezoelectric particles inclusions

Ende

Kempen

et al. 2012

Journal of Applied Physics

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Piezoelectric composites were prepared by dielectrophoretic alignment of high aspect ratio piezoelectric particles in a thermosetting polymer matrix. A high level of alignment was achieved in the cured composite from a resin containing randomly oriented high aspect ratio particles. Upon application of an electric field during curing of the resin, the particles were found to rotate with their long axes in the direction of the electric field, before coalescing to form chains. The dielectric and piezoelectric properties of the structured composites are well described by an analytical model for composites containing particles arranged into chains. The influence of degree of rotation and aspect ratio of the individual particles as well as their spacing is described with this model. The results correlate with the experimental values for both permittivity and piezoelectric constants in the poling direction. Dielectric and piezoelectric properties were significantly improved with respect to randomly dispersed piezoelectric ceramic powder-polymer composites and the maximum g 33 was shifted to a lower volume fraction. The results could have implications for development of dielectric and piezoelectric (nano-)fiber composites for dielectrics such as embedded capcitors, as well as piezoelectrics for sensing and energy harvesting applications. V C 2012 American Institute of Physics.

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High- and low-field dielectric characteristics of dielectrophoretically aligned ceramic/polymer nanocomposites

Cited by 93 publications

References 23 publications

Space Charge Behavior in Oil-Impregnated Insulation Paper Reinforced with Nano-TiO2

Space Charge Behavior in Oil-Impregnated Insulation Paper Reinforced with Nano-TiO2

Improving the d33 and g33 properties of 0-3 piezoelectric composites by dielectrophoresis

Dielectrophoretically structured piezoelectric composites with high aspect ratio piezoelectric particles inclusions

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