Skin-friendly and antibacterial monodomain liquid crystal elastomer actuator

Jiang, Yilin; Dong, Xu; Zhu, Shuchai; Dai, Shengping; Bai, Hongyu; Li, Qingyue; Li, Lvzhou; Yuan, Ningyi; Ding, Jianning

doi:10.1016/j.colsurfb.2022.113110

Cited by 8 publications

(2 citation statements)

References 45 publications

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“…The dielectric constant of a material increases with the strengthening of its polarization under an external electric field. In the case of LCEs, the polarization is influenced by the rotational difficulty of the mesogens (segment flexibility) . To investigate this phenomenon, we focused on RM257 possessing high electric dipole moments.…”

Section: Resultsmentioning

confidence: 99%

“…In the case of LCEs, the polarization is influenced by the rotational difficulty of the mesogens (segment flexibility). 25 To investigate this phenomenon, we focused on RM257 possessing high electric dipole moments. We explored the impact of different chain extenders�C 1 , bis(2-mercaptoethyl) ether (DSH); C 2 , 3,6-dioxa-1,8-octanedithiol (EDDET); and C 3 , 1,4-butanediol bis(mercapto ester) (BDBT))�and their ratios on the relative dielectric constant and dielectric loss of the LCE films (Figure S1).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Flexible Capacitive Sensors Based on Liquid Crystal Elastomer

Li,

Bai,

Dong

et al. 2023

Langmuir

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The disordered transformation of the ordered aligned polar liquid crystal molecules in liquid crystal elastomers (LCEs) under the influence of an external field imbues them with the unique property of thermally reversible shape memory, making them highly valuable for various applications, particularly in actuators. In this study, we examined the high dielectric constant exhibited by the orientation polarization of polar liquid crystal molecules in RM257-LCE films, which holds significant potential for developing flexible capacitive sensors. By manipulating the flexibility of the molecular chain network and introducing hydrogen bonds and metal ions into the main chain, we were able to enhance the relative dielectric constant of LCEs to an impressive value of 62 (at 100 Hz), which is approximately 23 times higher than for polydimethylsiloxane (PDMS). This elevated dielectric constant displays a noteworthy positive temperature coefficient within a specific temperature range, starting from room temperature and extending to the clearing point. Using this property, we fabricated highly sensitive capacitive, flexible temperature sensors. Moreover, we successfully engineered a flexible pressure sensor with an excellent pressure-sensing range of 0−2 MPa by combining the porous structure of the prepared LCEs with mushroom electrodes. Additionally, the sensor showcases a remarkable capacitance recovery time of 0.8 s at 90 °C. These outstanding features collectively contribute to the excellent pressure-sensing characteristics of our sensor. The findings of this study offer valuable insights and serve as a reference for the design of innovative flexible sensors, enabling advancements in sensor technology.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Flexible Capacitive Sensors Based on Liquid Crystal Elastomer

Li,

Bai,

Dong

et al. 2023

Langmuir

Self Cite

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Organic Flexible Electronics for Innovative Applications in Electronic Skin

Liu,

Li,

Tao

et al. 2024

Adv Materials Technologies

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The emergence of cutting‐edge cross‐disciplines has motivated the rapid development of wearable technology and flexible electronics. The flexibility and tunable properties of organic materials enable organic flexible electronics to adapt to complex surface deformations and achieve sensitive detection of physiological signals. The cost‐effectiveness of organic materials in mass production offers additional possibilities for the practical and commercialization of e‐skin technology. However, how to ensure stability and long‐term reliability while maintaining a highly sensitive, flexible, and stretchable is a challenge for e‐skins. In this review, the research progress and development trend of e‐skin is systematically summarized, especially the latest breakthroughs and innovations in the frontier of organic flexible electronics, and systematically review the applications of e‐skin in sensors, physiological monitoring, and energy supply. In addition, the review further discusses the prospects and current challenges for the application of organic flexible electronics in e‐skin, which provides a one‐stop reference for the development of e‐skin.

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Programmable, Self‐Healable, and Photochromic Liquid Crystal Elastomers Based on Dynamic Hindered Urea Bonds for Biomimetic Flowers

Xu,

Zhu,

et al. 2024

Small

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Recently, researchers have been exploring the use of dynamic covalent bonds (DCBs) in the construction of exchangeable liquid crystal elastomers (LCEs) for biomimetic actuators and devices. However, a significant challenge remains in achieving LCEs with both excellent dynamic properties and superior mechanical strength and stability. In this study, a diacrylate‐functionalized monomer containing dynamic hindered urea bonds (DA‐HUB) is employed to prepare exchangeable LCEs through a self‐catalytic Michael addition reaction. By incorporating DA‐HUB, the LCE system benefits from DCBs and hydrogen bonding, leading to materials with high mechanical strength and a range of dynamic properties such as programmability, self‐healing, and recyclability. Leveraging these characteristics, bilayer LCE actuators with controlled reversible thermal deformation and outstanding dimensional stability are successfully fabricated using a simple welding method. Moreover, a biomimetic triangular plum, inspired by the blooming of flowers, is created to showcase reversible color and shape changes triggered by light and heat. This innovative approach opens new possibilities for the development of biomimetic and smart actuators and devices with multiple functionalities.

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Skin-friendly and antibacterial monodomain liquid crystal elastomer actuator

Cited by 8 publications

References 45 publications

Flexible Capacitive Sensors Based on Liquid Crystal Elastomer

Flexible Capacitive Sensors Based on Liquid Crystal Elastomer

Organic Flexible Electronics for Innovative Applications in Electronic Skin

Programmable, Self‐Healable, and Photochromic Liquid Crystal Elastomers Based on Dynamic Hindered Urea Bonds for Biomimetic Flowers

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