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12 April 2007 Electroactivity of polymeric suspensions
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Two types of the electroactive response in polymeric suspensions can be considered - dielectrostriction and piezoresistance. Dielectrostriction is a variation of dielectric properties of a material with deformation while piezoresistance involves a change in conductivity with deformation. Both phenomena have similar microscopic foundation - they arise from variation of local electric field due to the redistribution of polarized or conductive inclusions. Both dielectrostriction and piezoresistance are determined by the pair distribution function of inclusions and are sensitive to a material's microstructure, which renders them effective for material characterization. In this study, dielectrostriction effect of silicone/aluminum oxide (Al2O3) and piezoresistance effect in silicone/graphite suspensions during oscillatory shear deformations are detected by a rosette of planar sensors with mutually perpendicular electrodes. In both measurements, the electric responses are found to be scaled with the deformation-induced stresses. Moreover, the variation of dielectrostriction response with suspensions having various particle size distributions indicates the high sensitivity of dielectrostriction to material's microstructure. Dielectrostriction and piezoresistance constitute new approaches to study the rheological properties of suspensions and compliment each other for revealing the microstructure in various systems.
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Yiyan Peng, John K. Edmiston, and Yuri M. Shkel "Electroactivity of polymeric suspensions", Proc. SPIE 6526, Behavior and Mechanics of Multifunctional and Composite Materials 2007, 65261O (12 April 2007);

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