Enhanced soft dielectric composite generators: the role of ceramic fillers

Bortot, Eliana, Springhetti, Roberta and Gei, Massimiliano (2014) Enhanced soft dielectric composite generators: the role of ceramic fillers. Journal of the European Ceramic Society, 34 (11). pp. 2623-2632. ISSN 0955-2219

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Abstract

A notable issue in the field of dielectric elastomers is the characterization of composite materials with improved electromechanical coupling destined for mechanical-to-electrostatic energy converters. To this aim, random composites, where ceramic fillers with high dielectric constant are dispersed in a silicone matrix, represent an interesting option. Currently, the most promising reinforcing materials to be immersed in a silicone matrix, already tested for soft dielectric actuators, are lead magnesium niobate–lead titanate (PMN–PT) and lead zirconate-titanate (PZT). To estimate the performance improvement entailed by the composite device with respect to the homogeneous matrix, a typical four-phase cycle is considered in the model, where nominal load and electric charge are alternately held constant. Different materials are being studied: a composite consisting of a matrix in poly-dimethyl-siloxane (PDMS) reinforced with PMN–PT, assuming a filler concentration of 10% in volume and a PDMS–PZT composite with a 1% volume fraction of the ceramic component. In comparison with pure PDMS, the PDMS–10%PMN–PT allows an increase of more than 60% in the harvested energy per unit volume, while the PDMS–1%PZT composite, entailing a minor improvement, here in the range 23.5–37.4%, exhibits a better performance in terms of generated energy per unit weight. These results provide a guide for the choice and design of materials suitable for the realization of enhanced energy harvesters.

Item Type:	Article
Uncontrolled Keywords:	Smart materials, Dielectric elastomers, Ceramic fillers, Energy harvesting, Energy generators
Subjects:	J300 Ceramics and Glasses
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Becky Skoyles
Date Deposited:	11 Apr 2019 13:39
Last Modified:	10 Oct 2019 20:04
URI:	http://nrl.northumbria.ac.uk/id/eprint/38942

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