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Structural flexible electronic skin

An electronic skin and structural technology, applied in the field of flexible sensors, can solve the problems of complex preparation process and inability to truly simulate the mechanical properties of human skin, and achieve the effects of high tactile sensitivity, large stretchable strain, and strong bearing capacity

Inactive Publication Date: 2020-01-10
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Yuan Liushu and others invented "a method for preparing flexible and high-strength robotic skin" (CN109249422A), which prepared a high-strength electronic skin through micro-nano processing techniques such as photolithography, microfluidics, and 3D printing. The process is too complicated, and at the same time, it cannot truly simulate the mechanical properties of human skin
At present, it is still a huge challenge to completely imitate the mechanical behavior and sensing properties of human skin, and to obtain an electronic skin that is stretchable, high-strength, and can monitor the stress distribution state.

Method used

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  • Structural flexible electronic skin
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  • Structural flexible electronic skin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] ① Mix carbon black and polydimethylsiloxane evenly, pour into a mold for curing, and obtain a flexible composite material sheet with a thickness of 2mm.

[0026] ② Prepare as figure 2 (A) In the mold shown in (A), two bundles of carbon fibers are cross-wound on the bottom of the short column in the mold to form a quasi-sinusoidal structure. The volume content of the electrode array accounts for 0.52% of the electronic skin.

[0027] ③Cut the composite sheet obtained in step ① into a cylindrical tactile unit of φ5*2mm, such as figure 2 As shown in (A), the tactile units are arranged in the mold, and the arrangement density of the tactile units is 1 / cm -2 ; Cross-wind the carbon fiber electrodes on top of the haptic unit in the same way along the direction perpendicular to the carbon fiber winding at the bottom of the mold stub.

[0028] ④ Use the piezoresistive composite material mixture (before curing) configured in ① as an adhesive, coat the upper and lower surfac...

Embodiment 2

[0033] ① Mix carbon nanotubes and polydiethylsiloxane evenly, pour them into a mold for curing, and obtain a flexible composite material sheet with a thickness of 4 mm.

[0034] ②The copper wire electrodes are cross-wound at the bottom of the mold to form a zigzag structure. The buckling degree of the fiber electrode array (the ratio of the length of the zigzag structure after straightening to that before unstretching) is 1.8, and the volume content of the fiber electrode array in the electronic skin is 0.6%.

[0035] ③Cut the composite sheet obtained in step ① into cylindrical tactile units of φ3*4mm, arrange the tactile units in the mold, and the arrangement density of the tactile units is 3 pieces / cm -2 ; Along the direction perpendicular to the winding of the copper wire at the bottom of the mold stub, cross-wind the copper wire electrode on the top of the haptic unit in the same manner.

[0036] ④ Use the piezoresistive composite material mixture (before curing) configur...

Embodiment 3

[0040] ① Evenly mix graphene and polymethylvinyl siloxane, pour it into a mold for curing, and obtain a 10mm thick flexible composite material sheet.

[0041] ②The silver wire electrodes are cross-wound at the bottom of the mold to form an "S"-shaped structure. The degree of buckling of the fiber electrode array (the ratio of the length of the "S"-shaped structure after straightening to that before unstraightening) is 2.4. The volume content is 0.23%.

[0042] ③Cut the composite sheet obtained in step ① into cylindrical tactile units of φ15*10mm, arrange the tactile units in the mold, and the arrangement density of the tactile units is 0.5 pieces / cm - 2 ; Along the direction perpendicular to the winding of the silver wire at the bottom of the short column of the mold, cross-wind the silver wire electrode on the top of the haptic unit in the same way.

[0043] ④ Use the piezoresistive composite material mixture (before curing) configured in ① as an adhesive, coat the upper an...

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Abstract

The invention provides a structural flexible electronic skin. The electronic skin is composed of a flexible base body, a tactile dot matrix and a sine-like structure fiber electrode array. Under the stimulation of an external physical signal, the tactile dot matrix has structural deformation, so that a tactile unit generates resistance change, and the space load condition is converted into a specific electric signal; and benefited from the quasi-sine structure design of fiber electrodes, the electronic skin has good flexibility and stretchability in a low strain range, and when the tensile strain is close to the designed strain, the fiber electrodes begin to bear the load and endow the electronic skin with high tensile strength. The electronic skin has flexible and high-strength mechanicalproperties and tactile sensing capacity, not only can monitor size of strain or stress, but also can obtain dynamic stress distribution information, and has good application prospects in robots, prostheses and the like.

Description

technical field [0001] The invention relates to the technical field of flexible sensors, in particular to a structural flexible electronic skin. [0002] technical background [0003] Skin is one of the most complex organs in the human body. It can not only convert environmental stimuli into physiological signals, but also make joints or muscles flexible, and protect internal organs from damage. In addition, human skin has numerous mechanical signal receptors distributed in the epidermis and dermis, which enables us not only to perceive the size of mechanical signals, but also to effectively identify the position and direction of mechanical signals, which is very important for humans to manipulate objects through touch. important. Therefore, designing and fabricating a stretchable strain sensor array as the mechanical signal receiving element of the electronic skin is the key to obtaining high-resolution stress distribution information for the electronic skin. [0004] In a...

Claims

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Application Information

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IPC IPC(8): A61F2/10G01L1/18
CPCA61F2/105G01L1/18
Inventor 李元庆付亚飞杨刚黄培付绍云
Owner CHONGQING UNIV
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