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Electroclinic effect in chiral smectic - A liquid crystal elastomers

Cohen, Noy and Bhattacharya, Kaushik (2017) Electroclinic effect in chiral smectic - A liquid crystal elastomers. Physical Review E, 96 (3). Art. No. 032701. ISSN 2470-0045. https://resolver.caltech.edu/CaltechAUTHORS:20170918-090755079

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Abstract

Chiral smectic-A liquid crystal elastomers are rubbery materials composed of a lamellar arrangement of liquid crystalline mesogens. It has been shown experimentally that these materials shear when subjected to an electric field due to the electrically induced tilt of the director. Experiments have also shown that shearing a chiral smectic-A elastomer gives rise to a polarization. Roughly, the shear force tilts the directors which, in turn, induce electric dipoles. This paper builds on previous works and models the electromechanical response of smectic-A elastomers using free energy contributions that are associated with the lamellar structure, the relative tilt between the director and the layer normal, and the coupling between the director and the electric field. To illustrate the merit of the proposed model, two cases are considered—a deformation induced polarization and an electrically induced deformation. The predictions according to these two models qualitatively agree with experimental findings. Finally, a cylinder composed of helical smectic layers is also considered. It is shown that the electromechanical response varies as a function of the helix angle.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1103/PhysRevE.96.032701DOIArticle
https://journals.aps.org/pre/abstract/10.1103/PhysRevE.96.032701PublisherArticle
ORCID:
AuthorORCID
Cohen, Noy0000-0003-2224-640X
Bhattacharya, Kaushik0000-0003-2908-5469
Additional Information:© 2017 American Physical Society. Received 30 June 2017; published 18 September 2017. We are grateful for the financial support of the US Air Force Office of Scientific Research through the MURI Grant No. FA9550-16-1-0566.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-16-1-0566
Issue or Number:3
Record Number:CaltechAUTHORS:20170918-090755079
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170918-090755079
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81514
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Sep 2017 17:38
Last Modified:03 Oct 2019 18:43

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