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Role of adhesion and air ionization in film-based electrostatic actuation.

Number: 0026

Author(s) : ZOGHBI E., DUFRESNE E., LOBUE M., ALMANZA M.

Summary

Electrostatic actuation (EA) on electrocaloric (EC) films plays an important role in transferring heat in cooling devices [1] and thermal switches [2], where heat is exchanged by the moving active film. Understanding actuation losses is crucial for improving efficiency, but it is difficult due to the interplay between adhesion and partial discharges. Analyzing the position of the film via the capacitance versus the voltage reveals that a minimum trigger voltage is required to begin the EA motion. On the other hand, the actuation efficiency and forces can be reduced by the appearance of charges on the film surface when the voltage exceeds a threshold. Here, we study the EA working voltage range, between the lower bound related to adhesion forces and the upper bound due to air ionization [3], and there is a lower limit of 3.25 μJ/cm2 for the actuation losses, a detrimental effect for thermal switches.

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Pages: 11 p.

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  • Original title: Role of adhesion and air ionization in film-based electrostatic actuation.
  • Record ID : 30035075
  • Languages: English
  • Source: 11th IIR Conference on Solid-State Cooling, Heating and Energy Harvesting.
  • Publication date: 2026/06/07
  • DOI: http://dx.doi.org/10.18462/iir.thermag.2026.0026

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