Thermoresponsive actuation enabled by permittivity switching in an electrostatically anisotropic hydrogel

Youn Soo Kim, Mingjie Liu, Yasuhiro Ishida, Yasuo Ebina, Minoru Osada, Takayoshi Sasaki, Takaaki Hikima, Masaki Takata, Takuzo Aida

研究成果: Article

238 引用 (Scopus)

抜粋

Electrostatic repulsion, long used for attenuating surface friction, is not typically employed for the design of bulk structural materials. We recently developed a hydrogel with a layered structure consisting of cofacially oriented electrolyte nanosheets. Because this unusual geometry imparts a large anisotropic electrostatic repulsion to the hydrogel interior, the hydrogel resisted compression orthogonal to the sheets but readily deformed along parallel shear. Building on this concept, here we show a hydrogel actuator that operates by modulating its anisotropic electrostatics in response to changes of electrostatic permittivity associated with a lower critical solution temperature transition. In the absence of substantial water uptake and release, the distance between the nanosheets rapidly expands and contracts on heating and cooling, respectively, so that the hydrogel lengthens and shortens significantly, even in air. An L-shaped hydrogel with an oblique nanosheet configuration can thus act as a unidirectionally proceeding actuator that operates without the need for external physical biases.

元の言語English
ページ(範囲)1002-1007
ページ数6
ジャーナルNature Materials
14
発行部数10
DOI
出版物ステータスPublished - 2015 8 10
外部発表Yes

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics
  • Materials Science(all)
  • Chemistry(all)

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  • これを引用

    Kim, Y. S., Liu, M., Ishida, Y., Ebina, Y., Osada, M., Sasaki, T., Hikima, T., Takata, M., & Aida, T. (2015). Thermoresponsive actuation enabled by permittivity switching in an electrostatically anisotropic hydrogel. Nature Materials, 14(10), 1002-1007. https://doi.org/10.1038/nmat4363