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Liquid metal-polymer composite soft actuator and preparation method thereof

A software driver, liquid metal technology, applied in the direction of manufacturing tools, manipulators, etc., can solve the problems affecting the overall performance of the driver, the irregular shape of the droplet, the anisotropy of the performance distribution, etc., and achieve excellent light/heat/electricity-mechanical energy conversion ability, the effect of excellent humidity response

Active Publication Date: 2021-06-29
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, many researchers at home and abroad have filled LM into polymer elastomers to construct functional soft actuators. However, the current preparation methods mainly rely on mechanical mixing, which may lead to irregular droplet shapes and various performance distributions. Anisotropy, which affects the overall performance of the drive

Method used

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  • Liquid metal-polymer composite soft actuator and preparation method thereof
  • Liquid metal-polymer composite soft actuator and preparation method thereof
  • Liquid metal-polymer composite soft actuator and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Take 10mL of the above-mentioned liquid metal-based functional coating and coat it on the surface of hydrophobic polytetrafluoroethylene (PTFE) substrate. At room temperature, through evaporation and sintering, combined with the density gradient relationship, an organic / inorganic coating with precise and controllable thickness can be obtained. Janus self-supporting smart film materials, as Figure 6 shown. It can be seen from the figure that the upper layer is off-white and combined with the scanning electron microscope, it can be seen that it is mainly composed of nanocellulose, and the lower layer is silver. Combined with the scanning electron microscope, it can be seen that it is mainly composed of liquid metal nanoparticles with uniform size and close connection, and There is a small amount of nanocellulose distributed around the particles. Through the capillary action of nanocellulose, the liquid metal oxide layer is destroyed, and the stable conductivity of the s...

Embodiment 2

[0050] The liquid metal-based functional coating prepared above is selectively coated on the surface of a polymer shape memory polymer (SMP) substrate (such as polystyrene, referred to as PS), and under the action of non-focused near-infrared light, to achieve Three-dimensional self-folding of different patterns, turning off the non-focused near-infrared light, the self-folding pattern remains unchanged.

[0051] (1) V-shaped pattern

[0052] Such as Figure 11 As mentioned above, 50 μL of liquid metal-based functional paint is selectively coated on the middle part of the 25 mm × 10 mm × 0.2 mm SMP substrate, as a hinge, its length and width are 10 mm × 1.2 mm, after natural drying, through non-focusing near Infrared light effect, due to the excellent photothermal and thermal conductivity of EGaIn and GNRs-COOH in the coating area, the pre-stretched SMP in the coating area is heated to the shape recovery temperature (such as Tg), the reversible phase softens and the stationar...

Embodiment 3

[0060] Such as Figure 15 As described above, the liquid metal-based functional coating prepared above is coated on a liquid crystal elastomer (LCE) (15mm×3.0mm×23μm) substrate, and after natural drying, the surface layer is liquid due to the action of 808nm near-infrared light. The excellent photothermal and thermal conductivity of metal and gold nanorods will induce the anisotropic to isotropic phase transition of the liquid crystal elastomer, so that the coated liquid crystal film will undergo a phenomenon from initial bending to flatness and then to reverse bending. Infrared light will cause the liquid crystal film in the coating area to change from isotropic to anisotropic phase, causing the coated liquid crystal film to return to its original state. By repeating this process, hundreds of reversible bends of the coated liquid crystal film can be achieved, such as Figure 16 shown. At the same time, due to the high capillary force generated by the modified BC during the ...

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Abstract

The invention discloses a liquid metal-polymer composite soft actuator and a preparation method thereof. Liquid metal nano liquid drops are coated with polymer nano cellulose to prepare a binary dispersion system; for further improving the stability and response performance of the binary system, a photo-thermal agent is introduced to construct a ternary steady-state dispersion system, namely a liquid metal-based functional coating; a liquid metal-based self-supporting intelligent thin film material is prepared by spontaneously inducing sintering and combining a density gradient relation without the help of external intervention; and meanwhile, the liquid metal-based functional coating can selectively coat different stimuli-responsive high-molecular polymer substrates, and an intelligent soft actuator with multiple stimuli-responsiveness can be developed. The actuator and the method not only provide principle support for solving the stability problem of the liquid metal and endowing the liquid metal with multifunctional application, but also provide scientific basis and theoretical support for expanding the application of the liquid metal in the fields of artificial muscles, soft robots, microcircuits, sensing, biomedical treatment, wearable equipment and the like.

Description

technical field [0001] The invention relates to the technical field of intelligent soft robots, in particular to a liquid metal-polymer composite soft driver and a preparation method thereof. Background technique [0002] In recent years, with the increasing demand for soft materials, the application of flexible materials in the fields of intelligent sensing, software driving and bionic functions has attracted widespread attention. Compared with traditional rigid materials, flexible materials have very unique motion systems and control mechanisms, which enable them to be applied in many special fields. Drawing inspiration from nature, people have been extensively working on the development of soft materials based on various smart sensors (such as shape memory polymers (SMP), liquid crystal elastomers (LCE), liquid metals (LM) and polymer hydrogels. Glue) artificial software driver. Among them, the LM driver has attracted great attention due to its fluidity of liquid and el...

Claims

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Application Information

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IPC IPC(8): B25J11/00B25J19/00
CPCB25J11/00B25J19/007
Inventor 王玲吕鹏飞杨潇雪盼封伟
Owner TIANJIN UNIV
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