Enhancing Dry Adhesion of Polymeric Micropatterns by Electric Fields

Vaishali Chopra, Maciej Chudak, René Hensel, Anton A. Darhuber, Eduard Arzt (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

Micropatterned dry adhesives rely mainly on van der Waals interactions. In this paper, we explore the adhesion strength increase that can be achieved by superimposing an electrostatic field through interdigitated subsurface electrodes. Micropatterns were produced by replica molding in silicone. The adhesion forces were characterized systematically by means of experiments and numerical modeling. The force increased with the square of the applied voltage for electric fields up to 800 V. For larger fields, a less-than-quadratic scaling was observed, which is likely due to the small, field-dependent electrical conductivity of the materials involved. The additional adhesion force was found to be up to twice of the field-free adhesion. The results suggest an alternative method for the controlled handling of fragile or miniaturized objects.

Original languageEnglish
Pages (from-to)27708-27716
Number of pages9
JournalACS Applied Materials & Interfaces
Volume12
Issue number24
DOIs
Publication statusPublished - 17 Jun 2020

Keywords

  • air conductivity
  • electroadhesion
  • Maxwell stresses
  • microhandling
  • micropatterned adhesives

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