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Electrically induced deformation in chiral smectic elastomers with different domain structures.

Yang Ho Na1, Yuki Aburaya2, Hiroshi Orihara2

  • 1Department of Advanced Materials, Hannam University, Jeonmin-dong 461-6, Yuseong-gu, Daejeon 305-811, Korea.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 24, 2015
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Summary
This summary is machine-generated.

This study explores electrical actuation in chiral smectic liquid-crystal elastomers (LCEs). Different domain structures influence strain behavior, with one LCE showing dominant shear strain and the other a balance of shear and elongation strain.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Soft Matter Physics

Background:

  • Chiral smectic liquid-crystal elastomers (LCEs) exhibit unique electromechanical properties.
  • Understanding the relationship between molecular order and macroscopic strain is crucial for device applications.

Purpose of the Study:

  • To investigate and compare the electrical actuation behavior of two LCEs with distinct domain structures.
  • To elucidate the influence of molecular orientation and domain architecture on electric-field-induced strain.

Main Methods:

  • Utilized fluorescent bead tracking to measure two-dimensional strain tensors in ferroelectric elastomer films.
  • Applied electrical fields to induce actuation and analyzed the resulting strain response.
  • Characterized domain structures to correlate with observed mechanical behavior.

Main Results:

  • Electric-field-induced strain is polarity-dependent.
  • LCE1 exhibits dominant shear strain, while LCE2 shows comparable shear and elongation strains due to principal axis rotation.
  • Eigenvalues of the strain tensors differ significantly between LCE1 and LCE2, with LCE1 having larger absolute values.

Conclusions:

  • Domain structure critically impacts the electromechanical response of chiral smectic LCEs.
  • The observed differences in strain behavior are directly linked to variations in molecular orientation and domain architecture.
  • These findings provide insights for designing LCEs with tailored actuation properties.