3 April 2012 Flexible autonomous scavengers: the combination of dielectric polymers and electrets
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Abstract
Thanks to their high energy density and their flexibility, scavenging energy with dielectric polymer is a promising alternative to ensure the autonomy of various sensors such as in e-textiles or biomedical applications. Nevertheless, they are passive materials requiring a high bias voltage source to polarize them. Thus, we present here a new design of scavenger using polymer electrets for poling the dielectric polymer. Our scavenger is composed of commercial dielectric polymer (3M VHB 4910) with Teflon electrets developing a potential of -300V, and patterned grease electrodes. The transducer works in a pure shear mode with a maximal strain of 50% at 1Hz. The typical "3D-textured" structure of the scavenger allows the electrets to follow the movement of the dielectric. A complete electromechanical analytical model has been developed thank to the combination of electrets theory and dielectric modelling. Our new autonomous structure, on an optimal resistance, can produce about 0.637mJ.g-1.
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C. Jean-Mistral, C. Jean-Mistral, T. Vu Cong, T. Vu Cong, A. Sylvestre, A. Sylvestre, } "Flexible autonomous scavengers: the combination of dielectric polymers and electrets", Proc. SPIE 8340, Electroactive Polymer Actuators and Devices (EAPAD) 2012, 834029 (3 April 2012); doi: 10.1117/12.915149; https://doi.org/10.1117/12.915149
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