Function and Autonomous Behavior of Self-Oscillating  Polymer Systems

Hara, Yusuke

doi:10.3390/polym6071958

Cited by 5 publications

(4 citation statements)

References 39 publications

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“…Depending on the molecular design, material structure or doped components of the stimulus-responsive polymer materials, man-made self-oscillators can be propelled by different external stimuli, such as humidity, heat, light, chemical reactions and so on. 39–44 Among the various available stimuli, it is more significant that the self-oscillating systems can be propelled by light illumination due to their sustainability, noncontact mode, convenient controllability, and spatial-temporal precision.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the molecular design, material structure or doped components of the stimulusresponsive polymer materials, man-made self-oscillators can be propelled by different external stimuli, such as humidity, heat, light, chemical reactions and so on. [39][40][41][42][43][44] Among the various available stimuli, it is more significant that the self-oscillating systems can be propelled by light illumination due to their Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, P. R. China. E-mail: lichensha@hlju.edu.cn † Electronic supplementary information (ESI) available: Supplementary movie S1: the vertically hung HF-LCEC gradually changed from a straight structure to a coiled helix structure upon the irradiation of a NIR laser beam which shifted from the lower end to the top end of the HF-LCEC.…”

Section: Introductionmentioning

confidence: 99%

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Liquid crystalline elastomer self-oscillating fiber actuators fabricated from soft tubular molds

Sun,

Men,

Liu

et al. 2024

Soft Matter

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Liquid crystalline elastomer self-oscillating fiber actuators fabricated from soft tubular molds

Sun,

Men,

Liu

et al. 2024

Soft Matter

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“…This property enhances the robustness of self-oscillating systems [20,21]. These superiorities of self-oscillating machines are driving them to become attractive candidates for a variety of practical applications, including active machines [22][23][24][25][26][27][28], autonomous robotics [29], energy-absorbing devices [30,31], motors [32], etc.…”

Section: Introductionmentioning

confidence: 99%

A Light-Powered Liquid Crystal Elastomer Roller

Li,

Chen,

et al. 2023

Polymers

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Achieving and controlling the desired movements of active machines is generally accomplished through precise control of artificial muscles in a distributed and serialized manner, which is a significant challenge. The emerging motion control strategy based on self-oscillation in active machines has unique advantages, including directly harvesting energy from constant ambient light, and it has no need for complex controllers. Inspired by the roller, we have innovatively developed a self-rolling roller that consists of a roller and a liquid crystal elastomer (LCE) fiber. By utilizing a well-established dynamic LCE model and subjecting it to constant illumination, we have investigated the dynamic behavior of the self-rolling roller. Based on numerical calculations, it has been discovered that the roller, when subjected to steady illumination, exhibits two distinct motion regimes: the static regime and the self-rolling regime. The self-rolling regime, characterized by continuous periodic rolling, is sustained by the interaction between light energy and damping dissipation. The continuous periodic rolling observed in the self-rolling regime is maintained through the interplay between the dissipation of damping and the absorption of light energy. In the static state, the rolling angle of the roller begins to decrease rapidly and then converges to zero. Detailed investigations have been conducted to determine the critical conditions required to initiate self-rolling, as well as the essential system parameters that influence its frequency and amplitude. The proposed self-rolling roller has superiorities in its simple structure, light weight, alternative to manual labor, and speediness. This advancement is expected to inspire greater design diversity in micromachines, soft robotics, energy harvesters, and similar areas.

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“…Self-excited oscillation is a phenomenon in which a system moves continuously in a steady-state environment, and in which the alternating force to sustain the oscillation is generally manipulated by the motion itself [ 1 , 2 , 3 , 4 , 5 , 6 ]. It has broad application prospects in many fields such as energy harvesting, signal monitoring, soft robotics, medical equipment, among others [ 7 , 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Synchronization of a Passive Oscillator and a Liquid Crystal Elastomer Self-Oscillator Powered by Steady Illumination

Gan

et al. 2022

Polymers

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Self-oscillators have the advantages of actively harvesting energy from external steady environment, autonomy, and portability, and can be adopted as an engine to drive additional working equipment. The synchronous behavior of self-oscillators and passive oscillators may have an important impact on their functions. In this paper, we construct a self-oscillating system composed of a passive oscillator and an active liquid crystal elastomer self-oscillator powered by steady illumination, and theoretically investigate the synchronization of two coupled oscillators. There exist three synchronous regimes of the two coupled oscillators: static, in-phase, and anti-phase. The mechanisms of self-oscillations in in-phase and anti-phase synchronous regimes are elucidated in detail by calculating several key physical parameters. In addition, the effects of spring constant, initial velocity, contraction coefficient, light intensity, and damping coefficient on the self-oscillations of two coupled oscillators are further investigated, and the critical conditions for triggering self-oscillations are obtained. Numerical calculations show that the synchronous regime of self-oscillations is mainly determined by the spring constant, and the amplitudes of self-oscillations of two oscillators increase with increasing contraction coefficient, light intensity, and spring constant, while decrease with increasing damping coefficient. This study deepens the understanding of synchronization between coupled oscillators and may provide new design ideas for energy harvesters, soft robotics, signal detection, active motors, and self-sustained machinery.

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Function and Autonomous Behavior of Self-Oscillating Polymer Systems

Cited by 5 publications

References 39 publications

Liquid crystalline elastomer self-oscillating fiber actuators fabricated from soft tubular molds

Liquid crystalline elastomer self-oscillating fiber actuators fabricated from soft tubular molds

A Light-Powered Liquid Crystal Elastomer Roller

Synchronization of a Passive Oscillator and a Liquid Crystal Elastomer Self-Oscillator Powered by Steady Illumination

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