Electromechanical Response in Liquid Crystal Gels and Networks

Cheng Huang, Qiming Zhang, Antal Jákli

    Research output: Contribution to journalConference article

    2 Scopus citations

    Abstract

    The uniqueness of liquid crystals (LCs) lies in the large anisotropies in their properties, which can be utilized to generate high electromechanical responses. In a properly oriented liquid crystal polymer system, an external electric field can induce re-orientation 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 liquid crystal 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 has been shown that a homeotropically aligned liquid crystal gel in its nematic phase exhibits high electrically induced strain (>2%) with an elastic modulus of 100MPa 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 micro-electromechanical devices.

    Original languageEnglish (US)
    Pages (from-to)496-503
    Number of pages8
    JournalProceedings of SPIE - The International Society for Optical Engineering
    Volume5051
    DOIs
    Publication statusPublished - Nov 27 2003
    EventPROCEEDINGS OF SPIE SPIE - The International Society for Optical Engineering: Smart Structures and Materials 2003 Electroactive Polymer Actuators and Devices (EAPAD) - San Diego, CA, United States
    Duration: Mar 3 2003Mar 6 2003

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    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering

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