Nematic anisotropic liquid-crystal gels-self-assembled nanocomposites with high electromechanical response

Cheng Huang, Qiming Zhang, Antal Jákli

    Research output: Contribution to journalArticlepeer-review

    48 Scopus citations

    Abstract

    The uniqueness of liquid crystals (LCs) lies in the large anisotropies of their properties, which can be utilized to generate high electromechanical responses. In a properly oriented LC polymer system, an external electric field can induce reorientation of the mesogenic units possessing a dielectric anisotropy, which, when coupled with the shape anisotropy of the mesogenic units, can in turn produce large mechanical strain. Anisotropic LC gels, which can be obtained by in-situ photopolymerization of the reactive LC molecules in the presence of non-reactive LC molecules in an oriented state, are an example of such liquid-crystal polymer systems. It is shown here that a homeotropically aligned LC gel in its nematic phase exhibits high electrically induced strain (> 2 %) with an elastic modulus of 100 MPa and a high electromechanical conversion efficiency (75 %) under an electric field of 25 MV/m. These anisotropic LC polymeric materials could provide a technologically compatible system for such applications as artificial muscles and as microelectromechanical devices.

    Original languageEnglish (US)
    Pages (from-to)525-529
    Number of pages5
    JournalAdvanced Functional Materials
    Volume13
    Issue number7
    DOIs
    StatePublished - Jul 1 2003

    All Science Journal Classification (ASJC) codes

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

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