Electric actuation of nanostructured thermoplastic elastomer gels with ultralarge electrostriction coefficients

Bori Kim, Youn Duk Park, Kyoungho Min, Jin Hong Lee, Seung Sang Hwang, Soon Man Hong, Bong Hoon Kim, Sang Ouk Kim, Chong Min Koo

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Electrostriction facilitates the electric field-stimulated mechanical actuation of dielectric materials. This work demonstrates that introduction of dielectric mismatched nanodomains to a dielectric elastomer results in an unexpected ultralarge electrostriction coefficient, enabling a large electromechanical strain response at a low electric field. This strong electrostrictive effect is attributed to the development of an inhomogeneous electric field across the film thickness due to the high density of interfaces between dielectric mismatched periodic nanoscale domains. The periodic nanostructure of the nanostructured gel also makes it possible to measure the true electromechanical strain from the dimensional change monitored via in situ synchrotron small angle X-ray scattering. The work offers a promising pathway to design novel high performance dielectric elastomers as well as to understand the underlying operational mechanism of nanostructured multiphase electrostrictive systems. Without any contact with electrodes, nanostructured elastomers can electrically actuate. This supports the electric actuation of the nanostructured materials being dominated by a true electrostriction mechanism.

Original languageEnglish
Pages (from-to)3242-3249
Number of pages8
JournalAdvanced Functional Materials
Volume21
Issue number17
DOIs
Publication statusPublished - 2011 Sep 9

Keywords

  • actuators
  • block copolymers
  • dielectrics
  • electrostriction
  • thermoplastic elastomer gels

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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