A new cellular electret sensor-actuator

Research output: Chapter in Book/Report/Conference proceedingChapter


The new form of electret, EFoam, has a high degree of sensitivity, and can be manufactured with varying stiffness and shape. Initial investigations indicate sensitivity comparable to that of other commercially available piezoelectric polymers. Further work is needed to explore the maximum sensitivity attainable. Due to the nature of manufacture, EFoam can be made both in conventional sheet form, and bulk, three-dimensional shapes. The molding procedure used, combined with some post-processing, could confer EFoam with complex shapes, endowing different areas of the structure with heterogeneous and controllable mechanical properties. Finally, the resonant behavior (and so stiffness) of EFoam can be altered as a function of a dc-offset voltage applied.
Original languageEnglish
Title of host publication13th International Symposium on Electrets, 2008
ISBN (Print)978-1-4244-1850-3
Publication statusPublished - Sept 2008


  • electrets
  • electric sensing devices
  • piezoelectric actuators
  • polymer foams
  • EFoam
  • cellular electret sensor-actuator
  • mechanical sensitivity
  • piezoelectric behavior
  • polymer electret
  • stiffness


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