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Stretchable flexible functional conductor

A conductor and function technology, applied in the field of resistance sensing materials, can solve the problems of poor compatibility, failure, easy to overflow conductance, etc., and achieve the effect of broad application prospects and excellent conductive properties.

Inactive Publication Date: 2018-03-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technical bottleneck that limits the application of liquid metals in stretchable conductors is their poor compatibility with the flexible matrix, which is prone to overflow in the matrix and lead to conductance failure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A stretchable flexible functional conductor is as follows:

[0034] The single-channel liquid metal fibers prepared from silicone rubber had an inner diameter of 700 μm and a fiber length of 40 mm.

[0035] First, a liquid gallium-indium eutectic alloy (gallium:indium=3:2, g / g) was injected into the flow channel, and both ends were connected to electrodes and potted with epoxy resin.

[0036] The prepared conductor has a resistance of about 0.35Ω, and the single-channel liquid metal conductor can be directly stretched. Due to the good elasticity of silicone rubber, during the stretching-recovery process, the conductor resistance changes in response, such as image 3 shown. When the conductor is directly stretched by hand, the value of the relative resistance is different at different stretching amplitudes, and the resistance returns to the corresponding size during the recovery process of the conductor. The results show that the liquid metal flow channel has obvious r...

Embodiment 2

[0038] A liquid metal conductor with a double circular flow channel structure made of polyurethane, the inner diameter of the flow channel is 1 mm, and the length is 40 mm. g / g) is injected into the flow channel, and both ends are connected to electrodes and potted with epoxy resin.

[0039] The prepared conductor has a resistance of about 0.20Ω, and the dual-flow channel structure has good resistance stretch-recovery properties, making it an important application prospect in high-sensitivity and high-precision limb movement monitoring. like Figure 4 As shown, when it is used to detect the movement of the human neck, the human head rotates 90 degrees and then recovers. It can be clearly observed that the relative resistance of the conductor increases with the rotation of the head, and the relative resistance returns to the initial state when the head recovers. . Therefore, the dual-channel liquid metal flexible function has obvious resistance deformation-recovery response c...

Embodiment 3

[0041] The inner diameter is 200 nanometers, the wall thickness is 100 nanometers, and the length is 40 mm. The ultra-fine circular hollow channel structure silicone rubber fiber is injected into the non-toxic and safe liquid metal gallium. Preparation of functional flexible fibers.

[0042] Conductor resistivity as low as 2.16×10 -6 Ω·m, reaching the conductivity of gold and silver metals of the same level. Therefore, when a very low voltage of 0.1 V is applied, there is a response characteristic, which can effectively ensure the life safety of the human body (the voltage exceeding 36 V is harmful to the human body), so that it can be implanted in the human body and its artificial nerve fibers. It has important application prospects. Figure 5 In order to use the conductor as a human motion detection sensor to detect the resistance response of the wrist under different bending angles, a detection voltage of 0.1 V is applied. Figure 4 The results show that the flexible fu...

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Abstract

The invention discloses a stretchable flexible functional conductor. The stretchable flexible functional conductor comprises a hollow elastic fiber and a liquid metal. The hollow elastic fiber is an elastic fiber, acting as a conductor shell and having a hollow circular flow passage inside. The liquid metal is used as a conducting medium of the conductor, is encapsulated in the circular flow passage of the hollow elastic fiber, and is composed of a liquid metal tantalum and a liquid alloy of eutectic indium and tin thereof. The stretchable flexible functional conductor of the invention has a sensitive resistance-deformation response characteristic, the resistance change of the conductor at 0 to 140% tensile deformation can be clearly detected and the resistance response characteristic is exhibited at 0.1 V, so that the stretchable flexible functional conductor is allowed to have important application prospects in human limb movement detection.

Description

technical field [0001] The invention relates to the field of resistance sensing materials, in particular to a functional flexible conductor. Background technique [0002] Conductors with resistance-deformation responses have important application prospects in the field of force-sensitive sensing, especially in human motion monitoring, flexible robots, prosthetics, and smart clothes. Traditional conductors are mainly prepared by blending rigid fillers and flexible polymer matrices. The disadvantage of such conductors lies in the Young's modulus (10 5 -10 7 Pa) is about 5-6 orders of magnitude higher than the Young's modulus of the matrix, which leads to the hysteresis of the deformation of the rigid filler network during the deformation process of the conductor, which greatly reduces the resistance deformation response ability of the conductor. The liquid metal is in a flowing state at room temperature, has high electrical conductivity, low modulus, and has good mechanical...

Claims

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Application Information

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IPC IPC(8): H01B5/00H01B1/02H01B1/12G01L1/22G01D5/16
CPCH01B5/00G01D5/16G01L1/22H01B1/02H01B1/12
Inventor 刘岚巫运辉陈松刘书奇王萍萍刘海州
Owner SOUTH CHINA UNIV OF TECH
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