Magnetic levitation photothermal actuator with sunlight traction

Lu, Yu‐Ying; Luo, Huilong; Qiu, Jun

doi:10.1088/1361-665x/ac0672

Cited by 6 publications

(2 citation statements)

References 33 publications

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“…On the one hand, the CF obtained by carbonizing MS at 850 °C possesses an extremely high porosity of 99.6% and tightly connected skeletons, which is favorable for light reflections and light capture capability. [63,64] On the other hand, the continuously connected 3D network is preserved and porosity remains nearly unchanged after in situ crosslinking PCL. The crystals of crosslinked PCL on the surface are conducive to strong light scattering compared to carbon skeletons.…”

Section: Light Absorption and Light-driven Shape Memory Properties Of...mentioning

confidence: 99%

Triple Stimuli‐Responsive Flexible Shape Memory Foams with Super‐Amphiphilicity

Ding

Shi

et al. 2022

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source. Ko et al. construct a temperature-responsive SMP film by integrating polylactic acid (PLA) and thermoplastic polyurethane (TPU). [15] Ni et al. simply adjust the layers of graphene oxide coating on SMP to design thermal-responsive devices. [16] However, the single responsive ability cannot meet the requirement of increasingly complex and changeable application environment. [17][18][19] On the other hand, the solid planar or strip geometries of traditional SMPs limit the expansion of new horizons. [20][21][22][23] Thus, it is urgent and important to fabricate 3D porous and flexible SMPs with multiresponsive function.Recent advances have progressed to use a 3D porous material as the framework added with functional fillers to construct electrical/thermal conductive networks for achieving multi-responsive SME. [24,25] MS has aroused great interest as the 3D framework for its low cost, low density, high porosity, and great elasticity. [26] Carbonbased fillers including MXene, [27][28][29] carbon nanotubes (CNT), [30][31][32] graphene, [24,[33][34][35] and carbon black (CB) are preferred candidates for their excellent photothermal and electrothermal performance. [32,36] He et al. combine the MS framework with MXene/silver nanowires (AgNWs) to design a thermal/electrical transmissive 3D network. [37] Triple-stimuli responsive shape memory composites are obtained by injecting an SMP into the hybrid framework by vacuum impregnation. Wu et al. prepare graphene nanoplatelet (GNP) hybrid-coated MS (CG@MS) incorporated with polyethylene glycol (PEG) to realize a notable photo/electrostimuli SME. [38] However, complicated and costly methods are challenging for large-scale production. [39][40][41][42][43] Meanwhile, the poor compatibility between the 3D porous framework and the functional fillers, as well as the inhomogeneous dispersion, also pose problems.An alternative method for constructing the 3D electrical/ thermal conductive network is to carbonize the MS. [44] The obtained carbon foams (CFs) actually become brittle or fragile after high-temperature carbonization. The conductivity and photothermal activity of the CFs are also not satisfactory for initiating SME at a safe voltage or realizing photothermal conversion efficiently. [45] Herein, we propose a specific multi-step carbonization protocol for transforming commercial MS to highly porous CF with robust resilience, excellent photothermal and electrothermal properties. Owing to the super-amphiphilicity of Highly porous multi-responsive shape memory foams have unique advantages in designing 3D materials with lightweight for varied applications. Herein, a facile and efficient approach to fabricating a thermo-, electro-, and photo-responsive shape memory composite foam is demonstrated. A specific multi-step carbonization protocol is adopted for transforming commercial melamine sponge (MS) to highly porous carbon foam (CF) with robust elastic resilience, efficient electrothermal/photothermal conversions, and superamphiphilicity. It is a novel proposal for CF to ta...

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Section: Light Absorption and Light-driven Shape Memory Properties Of...mentioning

confidence: 99%

Triple Stimuli‐Responsive Flexible Shape Memory Foams with Super‐Amphiphilicity

Ding

Shi

et al. 2022

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“…Actuators based on optical pressure and gradient forces [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] can provide high-frequency mechanical excitation, but can only produce limited displacements. Indirect methods, like opto-thermal actuators, [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] opto-strictive actuators, [35,36] or related photomechanical crystalline materials, [37] can provide larger displacements, [22][23][24][25] but with limited actuation frequencies. Furthermore, many of these actuation principles depend on high optical drive powers or complex optoelectronic drive systems.…”

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confidence: 99%

Resonant‐Opto‐Thermomechanical Oscillator (ROTMO): A Low‐Power, Large Displacement, High‐Frequency Optically Driven Microactuator

Pevec

Đonlagić

2022

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A light‐driven micromechanical oscillator is presented, which can be operated by a low optical power (in the mW, or even the µW range), can produce large mechanical displacements (>5–100 µm), and can be designed to operate at frequencies from sub‐kHz up to more than 200 kHz. The actuation of the oscillator is achieved by an asymmetrically metal‐coated optical microwire configured into a silica micromechanical oscillator. The metalized optical microwire confines and absorbs the light strongly over a short distance, which results in a controlled optical power conversion into heat, and, consequently, into mechanical actuation through the temperature rise and the difference in thermal expansions of the silica microwire and the asymmetrically applied metal layer. Mechanical displacements are amplified further by the resonance operation of the oscillator, which is driven by a low‐power, harmonic optical excitation signal generated by a current‐modulated laser diode. Proper selection of the micromechanical oscillator's geometrical configuration and materials allows for a high‐frequency operation at large mechanical displacements of the oscillator, while relying on low excitation optical power. The presented concept of a fully optically driven micromechanical oscillator may, thus, present a basis for realization of new classes of actuated micro‐opto‐mechanical Systems and similar photonics microdevices.

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UV ozone‐modified Fe₃O₄‐PDMS film for solvent‐driven soft actuators with controlled and multi‐stable deformations

Xu,

Li,

Lei

et al. 2024

J of Applied Polymer Sci

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In recent years, solvent‐driven actuators have been capable of controlling deformations in response to external stimuli. However, a magnetic polydimethylsiloxane (PDMS) composite film with magnetic properties is traditionally developed using the micro‐electro‐mechanical system process. Although it has general actuation deformation, the composite film suffers from the problems of actuation and control. Here, this is done by co‐mixing PDMS and ferrosoferric oxide (Fe3O4) then waiting for curing and then undergoing ultraviolet‐ozone (UVO) surface treatment. By adjusting the time and orientation of the UVO treatment, a series of solvent‐driven actuators with multiform steady‐state structures (e.g., mono/bistable helix) is proposed. In addition, the deformation of the composite film under different geometrical parameters and surface constraints was visually predicted by incorporating finite element analysis methods. In addition, the controlled deformations of the composite film (such as box‐like, folded, and so on) are carried out by self‐morphing design. Finally, four bionic applications are also proposed to demonstrate the practical use of soft actuators based on Fe3O4‐PDMS films in bionic robots. This work provides new strategies for designing and fabricating programmable and controllable soft actuators and lays the foundation for a wide range of smart material applications.

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Magnetic levitation photothermal actuator with sunlight traction

Cited by 6 publications

References 33 publications

Triple Stimuli‐Responsive Flexible Shape Memory Foams with Super‐Amphiphilicity

Triple Stimuli‐Responsive Flexible Shape Memory Foams with Super‐Amphiphilicity

Resonant‐Opto‐Thermomechanical Oscillator (ROTMO): A Low‐Power, Large Displacement, High‐Frequency Optically Driven Microactuator

UV ozone‐modified Fe₃O₄‐PDMS film for solvent‐driven soft actuators with controlled and multi‐stable deformations

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Magnetic levitation photothermal actuator with sunlight traction

Cited by 6 publications

References 33 publications

Triple Stimuli‐Responsive Flexible Shape Memory Foams with Super‐Amphiphilicity

Triple Stimuli‐Responsive Flexible Shape Memory Foams with Super‐Amphiphilicity

Resonant‐Opto‐Thermomechanical Oscillator (ROTMO): A Low‐Power, Large Displacement, High‐Frequency Optically Driven Microactuator

UV ozone‐modified Fe3O4‐PDMS film for solvent‐driven soft actuators with controlled and multi‐stable deformations

Contact Info

Product

Resources

About

UV ozone‐modified Fe₃O₄‐PDMS film for solvent‐driven soft actuators with controlled and multi‐stable deformations