Multiscale modeling and its validation of the trans-cis-trans reorientation-based photodeformation in azobenzene-doped liquid crystal polymer

Yun, Jung-Hoon; Li, Chenzhe; Chung, Hayoung; Choi, Joonmyung; Cho, Maenghyo

doi:10.1016/j.ijsolstr.2017.08.011

Cited by 7 publications

(19 citation statements)

References 22 publications

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“…To efficiently model the light excitation, a steady-state plane wave (with a certain wavelength and light intensity) from one side of the sample was set. The light absorption was then evaluated by Beer–Lambert’s law . For the next step, the Structural Mechanics package was adopted to calculate the corresponding material deformation of the two-dimensional cantilever by introducing an equation that expressed the light-induced strain as a function of the retrieved light intensity.…”

Section: Resultsmentioning

confidence: 99%

“…The light absorption was then evaluated by Beer−Lambert's law. 24 For the next step, the Structural Mechanics package was adopted to calculate the corresponding material deformation of the two-dimensional cantilever by introducing an equation that expressed the lightinduced strain as a function of the retrieved light intensity. Then, the macroscopic photomechanical response (the lightinduced deformation, strain, and stress) was simulated by this approach.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Besides, the rewriting ability based on self-healing performance has been observed at the second level (within 10 s). To study the mechanism of multiscale deformation, we performed the multiphysics finite element modeling of the photomechanical response with COMSOL Multiphysics to simulate the processes of the motion cycle based on Beer−Lambert's law, 24 and the results matched the experimental data precisely, which provided a general simulation framework and a numerical confirmation method for such photoinduced SMP actuators.…”

Section: ■ Introductionmentioning

confidence: 99%

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Multiresponse Shape-Memory Nanocomposite with a Reversible Cycle for Powerful Artificial Muscles

Chen

Liu

et al. 2021

Chem. Mater.

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In the field of bionic soft robots and microrobots, artificial muscle materials have exhibited unique potential for cutting-edge applications. However, current mainstream thermal-responsive artificial muscles based on semicrystalline polymers (SCPs), despite their excellent physical properties, suffer from the limitation of environmental stimuli in practice, while their photodriven counterparts adopting liquid crystal elastomers (LCEs) lack ductility. Herein, a novel multifunctional programmable artificial muscle with a unique patch-sewing structure formed by π−π stacking between azobenzene groups was designed, which combined the advantages of SCPs and LCEs. The nanocomposite demonstrated a unique combination between artificial muscle performance (46.5 times the energy density and 26.6 times the power density of human skeletal muscles) and programmability (274.84% strain and 100% shape-memory recovery rate within 1 s). Meanwhile, coupling the photoisomerization of azobenzene and the photothermal conversion of gold nanorods, the cycle of deformation triggered by ultraviolet light and restoring by infrared light could be accomplished rapidly within 30 s. A COMSOL Multiphysics model was established and the corresponding finite element analysis verified the photoactuation and captured the general principle of light initiation in elastomers. These demonstrate that the multifunctional programmable elastomer is promising for artificial muscle applications, especially for photoinduced actuation.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Multiresponse Shape-Memory Nanocomposite with a Reversible Cycle for Powerful Artificial Muscles

Chen

Liu

et al. 2021

Chem. Mater.

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“…Parameter E rot can be predicted using the effective energy profile along the rotation angle of the azobenzene. The effective energy profile can be calculated from eq 3 32 as follows…”

Section: = −mentioning

confidence: 99%

“…After comparing the change in the ratio between the major and minor axes in terms of the step length, we derived the actual deformation of the azo-LCP along with the amount of rotation in the azobenzene monomer, as expressed in eq 10. 31,32…”

Section: = −mentioning

confidence: 99%

Comparing Photoactuation of an Azobenzene-Doped Nematic Liquid Crystal Polymer through Its Activation Mechanism: Trans–Cis–Trans Reorientation and Photoisomerization

Yun

Kim

et al. 2018

J. Phys. Chem. C

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We compare the actuation speeds of the azobenzene-doped nematic liquid crystal polymer (azo-LCP) by examining its activation mechanisms: photoisomerization and trans−cis−trans reorientation (TCTR) (also known as Weigert effect). Both experiments and modeling are carried out in this study to compare the speed of bending and contraction acting on azo-LCP. We identify that the TCTR-based photobending of azo-LCP generated less than half the photostrain in a unit cell than that in the photoisomerization case but involves a larger azo-LCP thickness in triggering photodeformation. Because photodeformation occurs in a deeper region than that in the photoisomerization case, the TCTR-based photobending of azo-LCP exhibits a faster bending speed than the photoisomerization-based photobending of azo-LCP, even though less strain is generated in the TCTR case.

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The effect of various functional groups on mesophase behavior and optical property of blue phase liquid crystal compounds based on (−)‑menthol

Luo

Sun

Wang

et al. 2018

Journal of Molecular Liquids

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Multiscale modeling and its validation of the trans-cis-trans reorientation-based photodeformation in azobenzene-doped liquid crystal polymer

Cited by 7 publications

References 22 publications

Multiresponse Shape-Memory Nanocomposite with a Reversible Cycle for Powerful Artificial Muscles

Multiresponse Shape-Memory Nanocomposite with a Reversible Cycle for Powerful Artificial Muscles

Comparing Photoactuation of an Azobenzene-Doped Nematic Liquid Crystal Polymer through Its Activation Mechanism: Trans–Cis–Trans Reorientation and Photoisomerization

The effect of various functional groups on mesophase behavior and optical property of blue phase liquid crystal compounds based on (−)‑menthol

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