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Electrically driven deformations of nematic gels.

Kenji Urayama1, Hidesato Kondo, Yuko O Arai

  • 1Department of Material Chemistry, Kyoto University, Kyoto 615-8510, Japan. urayama@rheogate.polym.kyoto-u.ac.jp

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 11, 2005
PubMed
Summary

Electrically driven nematic gels deform significantly, stretching or compressing based on dielectric anisotropy. These nematic gels exhibit rapid deformation and slower shape recovery, influenced by network properties.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Soft Matter Physics

Background:

  • Nematic gels, composed of side chain nematic networks and nematic solvents, exhibit unique properties due to the alignment of mesogens.
  • Understanding their electrically driven deformations is crucial for developing novel actuators and responsive materials.

Purpose of the Study:

  • To investigate the electrically driven deformations of nematic gels.
  • To analyze the influence of dielectric anisotropy and field strength on gel strain.
  • To examine the role of electrostriction and mesogen alignment in gel behavior.

Main Methods:

  • Freely suspended nematic gels were subjected to an electric field between electrodes.
  • Strains were measured as a function of electric field strength (E).

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  • Deformations were analyzed for gels with identical and opposite signs of dielectric anisotropy (Δϵ).

    • Main Results:

    • Gels with identical Δϵ signs elongate parallel or normal to the field, depending on Δϵ sign, with strains up to 20% at 0.5 MV/m.
    • Gels with opposite Δϵ signs compress along the field axis due to dominant electrostriction.
    • Isotropic phase gels show field-proportional compression (E²) from electrostriction.
    • Deformation occurs within seconds, while shape recovery takes minutes, reflecting structural relaxation.

    Conclusions:

    • The deformation of nematic gels is highly dependent on the dielectric anisotropy of the network and solvent.
    • Electrostriction plays a significant role, especially when mesogen alignment effects are counteracted.
    • Nematic gels offer potential for applications requiring electrically controlled shape changes, with distinct response and recovery dynamics.