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Enabling and Localizing Omnidirectional Nonlinear Deformation in Liquid Crystalline Elastomers
Author(s) -
Auguste Anesia D.,
Ward Jeremy W.,
Hardin James O.,
Kowalski Benjamin A.,
Guin Tyler C.,
Berrigan J. Daniel,
White Timothy J.
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201802438
Subject(s) - homeotropic alignment , materials science , deformation (meteorology) , elastomer , composite material , auxetics , fabrication , orientation (vector space) , omnidirectional antenna , nonlinear system , moiré pattern , optics , liquid crystal , optoelectronics , geometry , computer science , medicine , telecommunications , alternative medicine , mathematics , pathology , quantum mechanics , physics , antenna (radio)
Liquid crystalline elastomers (LCEs) are widely recognized for their exceptional promise as actuating materials. Here, the comparatively less celebrated but also compelling nonlinear response of these materials to mechanical load is examined. Prior examinations of planarly aligned LCEs exhibit unidirectional nonlinear deformation to mechanical loads. A methodology is presented to realize surface‐templated homeotropic orientation in LCEs and omnidirectional nonlinearity in mechanical deformation. Inkjet printing of the homeotropic alignment surface localizes regions of homeotropic and planar orientation within a monolithic LCE element. The local control of the self‐assembly and orientation of the LCE, when subject to rational design, yield functional materials continuous in composition with discontinuous mechanical deformation. The variation in mechanical deformation in the film can enable the realization of nontrivial performance. For example, a patterned LCE is prepared and shown to exhibit a near‐zero Poisson's ratio. Further, it is demonstrated that the local control of deformation can enable the fabrication of rugged, flexible electronic devices. An additively manufactured device withstands complex mechanical deformations that would normally cause catastrophic failure.