Programmable Liquid Crystal Defect Arrays via Electric Field Modulation for Mechanically Functional Liquid Crystal Networks

Ra You; Sumin Kang; Changjae Lee; Jisoo Jeon; Jeong Jae Wie; Taek Soo Kim; Dong Ki Yoon

doi:10.1021/acsami.1c04999

Programmable Liquid Crystal Defect Arrays via Electric Field Modulation for Mechanically Functional Liquid Crystal Networks

Ra You, Sumin Kang, Changjae Lee, Jisoo Jeon, Jeong Jae Wie, Taek Soo Kim, Dong Ki Yoon

Dept. of Mechanical & Automotive Engineering

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

The arrangement of mesogenic units determines mechanical response of the liquid crystal polymer network (LCN) film to heat. Here, we show an interesting approach to programming three-dimensional patterns of the LCN films with periodic topological defects generated by applying an electric field. The mechanical properties of three representative patterned LCN films were investigated in terms of the arrangement of mesogenic units through tensile testing. Remarkably, it was determined that LCN films showed enhanced toughness and ductility as defects increased in a given area, which is related to the elastic modulus mismatch that mitigates crack propagation. Our platform can also be used to modulate the frictional force of the patterned LCN films by varying the temperature, which can provide insight into the multiplex mechanical properties of LCN films.

Original language	English
Pages (from-to)	36253-36261
Number of pages	9
Journal	ACS Applied Materials and Interfaces
Volume	13
Issue number	30
DOIs	https://doi.org/10.1021/acsami.1c04999
State	Published - 4 Aug 2021

Keywords

electric field
friction
liquid crystal polymer networks
mechanical property
programmable

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10.1021/acsami.1c04999

Cite this

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title = "Programmable Liquid Crystal Defect Arrays via Electric Field Modulation for Mechanically Functional Liquid Crystal Networks",

abstract = "The arrangement of mesogenic units determines mechanical response of the liquid crystal polymer network (LCN) film to heat. Here, we show an interesting approach to programming three-dimensional patterns of the LCN films with periodic topological defects generated by applying an electric field. The mechanical properties of three representative patterned LCN films were investigated in terms of the arrangement of mesogenic units through tensile testing. Remarkably, it was determined that LCN films showed enhanced toughness and ductility as defects increased in a given area, which is related to the elastic modulus mismatch that mitigates crack propagation. Our platform can also be used to modulate the frictional force of the patterned LCN films by varying the temperature, which can provide insight into the multiplex mechanical properties of LCN films.",

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author = "Ra You and Sumin Kang and Changjae Lee and Jisoo Jeon and Wie, \{Jeong Jae\} and Kim, \{Taek Soo\} and Yoon, \{Dong Ki\}",

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doi = "10.1021/acsami.1c04999",

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T1 - Programmable Liquid Crystal Defect Arrays via Electric Field Modulation for Mechanically Functional Liquid Crystal Networks

AU - You, Ra

AU - Kang, Sumin

AU - Lee, Changjae

AU - Jeon, Jisoo

AU - Wie, Jeong Jae

AU - Kim, Taek Soo

AU - Yoon, Dong Ki

PY - 2021/8/4

Y1 - 2021/8/4

N2 - The arrangement of mesogenic units determines mechanical response of the liquid crystal polymer network (LCN) film to heat. Here, we show an interesting approach to programming three-dimensional patterns of the LCN films with periodic topological defects generated by applying an electric field. The mechanical properties of three representative patterned LCN films were investigated in terms of the arrangement of mesogenic units through tensile testing. Remarkably, it was determined that LCN films showed enhanced toughness and ductility as defects increased in a given area, which is related to the elastic modulus mismatch that mitigates crack propagation. Our platform can also be used to modulate the frictional force of the patterned LCN films by varying the temperature, which can provide insight into the multiplex mechanical properties of LCN films.

AB - The arrangement of mesogenic units determines mechanical response of the liquid crystal polymer network (LCN) film to heat. Here, we show an interesting approach to programming three-dimensional patterns of the LCN films with periodic topological defects generated by applying an electric field. The mechanical properties of three representative patterned LCN films were investigated in terms of the arrangement of mesogenic units through tensile testing. Remarkably, it was determined that LCN films showed enhanced toughness and ductility as defects increased in a given area, which is related to the elastic modulus mismatch that mitigates crack propagation. Our platform can also be used to modulate the frictional force of the patterned LCN films by varying the temperature, which can provide insight into the multiplex mechanical properties of LCN films.

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KW - friction

KW - liquid crystal polymer networks

KW - mechanical property

KW - programmable

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Programmable Liquid Crystal Defect Arrays via Electric Field Modulation for Mechanically Functional Liquid Crystal Networks

Abstract

Keywords

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