Coaxial Direct Ink Writing of Cholesteric Liquid Crystal Elastomers in 3D Architectures

Ng, Alicia; Telles, Rodrigo; Riley, Katherine S.; Lewis, Jennifer A.; Cook, Caitlyn C.; Lee, Elaine; Yang, Shu

doi:10.1002/adma.202416621

Title: Coaxial Direct Ink Writing of Cholesteric Liquid Crystal Elastomers in 3D Architectures

Journal Article · 26 January 2025 · Advanced Materials

DOI: https://doi.org/10.1002/adma.202416621 · OSTI ID:2507121

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Univ. of Pennsylvania, Philadelphia, PA (United States)
Harvard Univ., Cambridge, MA (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Cholesteric liquid crystal elastomers (CLCEs) hold great promise for mechanochromic applications in anti‐counterfeiting, smart textiles, and soft robotics, thanks to the structural color and elasticity. While CLCEs are printed via direct ink writing (DIW) to fabricate free‐standing films, complex 3D structures are not fabricated due to the opposing rheological properties necessary for cholesteric alignment and multilayer stacking. Here, 3D CLCE structures are realized by utilizing coaxial DIW to print a CLC ink within a silicone ink. By tailoring the ink compositions, and thus, the rheological properties, the cholesteric phase rapidly forms without an annealing step, while the silicone shell provides encapsulation and support to the CLCE core, allowing for layer‐by‐layer printing of self‐supported 3D structures. As a demonstration, free‐standing bistable thin‐shell domes are printed. Color changes due to compressive and tensile stresses can be witnessed from the top and bottom of the inverted domes, respectively. When the domes are arranged in an array and inverted, they can snap back to their base state by uniaxial stretching, thereby functioning as mechanical sensors with memory. The additive manufacturing platform enables the rapid fabrication of 3D mechanochromic sensors thereby expanding the realm of potential applications for CLCEs.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Army Research Office (ARO); USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2507121

Report Number(s):: LLNL--JRNL-870063

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 10 Vol. 37; ISSN 1521-4095; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
3D architectures
cholesteric liquid crystal elastomers
core-shell
direct ink writing
mechanochromic
passive sensing

Title: Coaxial Direct Ink Writing of Cholesteric Liquid Crystal Elastomers in 3D Architectures

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References (45)

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