Print Email Facebook Twitter Dielectrophoretically structured piezoelectric composites with high aspect ratio piezoelectric particles inclusions Title Dielectrophoretically structured piezoelectric composites with high aspect ratio piezoelectric particles inclusions Author Van den Ende, D.A. Van Kempen, S.E. Wu, X. Groen, W.A. Randall, C.A. Van der Zwaag, S. Faculty Aerospace Engineering Department Aerospace Materials & Manufacturing Date 2012-06-21 Abstract 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 g33 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. Subject curingdielectric polarisationfilled polymersinclusionslead compoundsparticle reinforced compositespermittivitypiezoceramicspiezoelectricitypowdersresins To reference this document use: http://resolver.tudelft.nl/uuid:1322cbd5-09ce-4233-ad12-6c851cda726c DOI https://doi.org/10.1063/1.4729814 Publisher American Institute of Physics ISSN 0021-8979 Source Journal of Applied Physics, 111 (12), 2012 Part of collection Institutional Repository Document type journal article Rights © 2012 American Institute of Physics Files PDF vanderZwaag_2012.pdf 2.46 MB Close viewer /islandora/object/uuid:1322cbd5-09ce-4233-ad12-6c851cda726c/datastream/OBJ/view