Hydrogel flexible strain sensor and preparation method thereof

A strain sensor, hydrogel flexible technology, applied in the application field of equipment, can solve the problem of sensor performance degradation, and achieve the effect of excellent performance, low cost and fast response speed

Pending Publication Date: 2020-06-05
广州钰芯传感科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the preparation of flexible strain sensors should meet the needs of low cost and large area. Generally speaking, silicon-based elastomers or rubber can be used as substrates. For strain sensors that need to be attached to the skin, they will impose a large number of complex dynamic changes. Therefore, its durability and self-healing performance are extremely important. Under high-intensity stress, the flexible material used as a sensor will break or bend, and the polymer used as a flexible substrate will undergo fatigue and plastic deformation, which will affect the performance of the sensor. Performance drops, so the present invention develops a novel hydrogel for flexible strain sensors

Method used

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  • Hydrogel flexible strain sensor and preparation method thereof
  • Hydrogel flexible strain sensor and preparation method thereof
  • Hydrogel flexible strain sensor and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Fabrication of hydrogel flexible strain sensors:

[0056] (1) Dissolve 7.5g of acrylamide, 1.5g of carrageenan, 0.005g of N,N'-methylenebisacrylamide, and 0.09g of potassium chloride in 41mL of deionized water, and perform oil bath magnetic Stir for 5 hours to synthesize the first network of carrageenan;

[0057] (2) Continue stirring after stopping heating, when the temperature drops to 70°C, add 0.024g ammonium persulfate and stir for 1 minute;

[0058] (3) Pour the solution into a Petri dish, cover it with aluminum foil, place it in an oven, and bake it at 90°C for 1 hour to polymerize to form a second polyacrylamide network. Storing for 1 hour at lower temperature, the K-type carrageenan double-network hydrogel was obtained;

[0059] (4) Clean and dry the K-type carrageenan double network hydrogel, install conductive electrodes, and package it into a flexible strain sensor.

Embodiment 2

[0061] Fabrication of hydrogel flexible strain sensors:

[0062] (1) Dissolve 7.5g of acrylamide, 1.5g of carrageenan, 0.005g of N,N'-methylenebisacrylamide, and 0.09g of potassium chloride in 41mL of deionized water, and perform oil bath magnetic Stir for 5 hours to synthesize the first network of carrageenan;

[0063] (2) Continue stirring after stopping heating, when the temperature drops to 70°C, add 0.024g ammonium persulfate and stir for 1 minute;

[0064] (3) Pour the solution into a Petri dish, cover it with aluminum foil, place it in an oven, and bake it at 90°C for 1 hour to polymerize to form a second polyacrylamide network. Storing for 1 hour at lower temperature, the K-type carrageenan double-network hydrogel was obtained;

[0065] (4) Soak the K-type carrageenan double network hydrogel prepared above in pure ethylene glycol solution for 5 minutes and then take it out;

[0066] (5) Clean and dry the K-type carrageenan double-network hydrogel, install conductive...

Embodiment 3

[0068] Fabrication of hydrogel flexible strain sensors:

[0069] (1) Dissolve 7.5g of acrylamide, 1.5g of carrageenan, 0.005g of N,N'-methylenebisacrylamide, and 0.09g of potassium chloride in 41mL of deionized water, and perform oil bath magnetic Stir for 5 hours to synthesize the first network of carrageenan;

[0070] (2) Continue stirring after stopping heating, when the temperature drops to 70°C, add 0.024g ammonium persulfate and stir for 1 minute;

[0071] (3) Pour the solution into a Petri dish, cover it with aluminum foil, place it in an oven, and bake it at 90°C for 1 hour to polymerize to form a second polyacrylamide network. Storing for 1 hour at lower temperature, the K-type carrageenan double-network hydrogel was obtained;

[0072] (4) Soak the K-type carrageenan double network hydrogel prepared above in pure ethylene glycol solution for 8 minutes and then take it out;

[0073] (5) Clean and dry the K-type carrageenan double-network hydrogel, install conductive...

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Abstract

The invention provides a hydrogel flexible strain sensor and a preparation method thereof. The K-type carrageenan double-network hydrogel is prepared, and the flexible strain sensor with thermal repairability, freezing resistance and stretchability is obtained after ethylene glycol is modified. The sensor has the excellent performances of high sensitivity, wide detection range, high response speed, high dynamic durability and the like, the toughness and elasticity modulus of the sensor can be adjusted by adjusting the soaking time of hydrogel in ethylene glycol, so that the performance of thesensor is more excellent, and the sensor can be applied to the fields of wearable equipment, flexible robots, electronic skin, medical care and the like.

Description

technical field [0001] The invention relates to a hydrogel flexible strain sensor and its preparation method and its application in equipment for detecting tensile strain. Background technique [0002] With the rise of wearable devices, the demand and research of flexible sensors are increasing, which need to have strong stretchability, ductility, bendability and durability, low power consumption and quality, if it is skin-friendly Non-toxic sensors must also be biocompatible. Flexible sensors can be used in human health monitoring, human motion monitoring, human-computer interaction and soft robotics, etc. [0003] As a basic sensor, strain sensor has produced many research results. Strain sensors are generally divided into resistive and capacitive. So far, researchers have used different materials to make strain sensors. Different materials have their own advantages and disadvantages in terms of mechanical and electrical properties, and it is usually difficult to achie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F222/38G01B7/16
CPCC08F251/00G01B7/18C08F220/56
Inventor 奚亚男胡淑锦
Owner 广州钰芯传感科技有限公司
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