skip to main content

SciTech ConnectSciTech Connect

Title: Temporal change in the electromechanical properties of dielectric elastomer minimum energy structures

Dielectric elastomer minimum energy structures (DEMES) are soft electronic transducers and energy harvesters with potential for consumer goods. The temporal change in their electromechanical properties is of major importance for engineering tasks. Therefore, we study acrylic DEMES by impedance spectroscopy and by optical methods for a total time period of approx. 4.5 months. We apply either compliant electrodes from carbon black particles only or fluid electrodes from a mixture of carbon black particles and silicone oil. From the measurement data, the equivalent series capacitances and resistances as well as the bending angles of the transducers are obtained. We find that the equivalent series capacitances change in average between −12 %/1000 h and −4.0 %/1000 h, while the bending angles decrease linearly with slopes ranging from −15 %/1000 h to −7 %/1000 h. Transducers with high initial bending angles and electrodes from carbon black particles show the smallest changes of the electromechanical characteristics. The capacitances decrease faster for DEMES with fluid electrodes. Some DEMES of this type reveal huge and unpredictable fluctuations of the resistances over time due to the ageing of the contacts. Design guidelines for DEMES follow directly from the observed transient changes of their electromechanical performance.
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. Institute for Microelectronics and Microsensors, Johannes Kepler University Linz, 4040 Linz (Austria)
  2. Institute of Technical Mechanics, Johannes Kepler University Linz, 4040 Linz (Austria)
  3. Department of Soft Matter Physics, Johannes Kepler University Linz, 4040 Linz (Austria)
Publication Date:
OSTI Identifier:
22304259
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CAPACITANCE; CARBON BLACK; DIELECTRIC MATERIALS; ELASTOMERS; ELECTRODES; FLUCTUATIONS; FLUIDS; IMPEDANCE; RECOMMENDATIONS; SILICONES; SPECTROSCOPY; TRANSDUCERS; TRANSIENTS