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Hydrogel flexible strain sensor and preparation method thereof

A strain sensor, hydrogel flexible technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., can solve the problems of low sensitivity, low elongation rate of hydrogel flexible sensor, etc.

Active Publication Date: 2021-04-30
SHENZHEN HAIPAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Currently reported hydrogel flexible sensors generally have problems such as low stretch rate and low sensitivity, which make it difficult to apply in the monitoring of strenuous human motion.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing a hydrogel flexible strain sensor, comprising the steps of:

[0039] Fabrication of hydrogel flexible strain sensors:

[0040] A. Synthesis of polydopamine:

[0041] Dissolve 0.5 g of dopamine hydrochloride in 10 ml of deionized water and stir with a glass rod until completely dissolved. Then, mix 40ml of ethanol and 1ml of ammonia solution (25-28%) with 90ml of deionized water, stir magnetically at room temperature for 30 minutes, and slowly inject into the above solution, the color of the mixed solution turns light brown and gradually turns dark brown, The reaction continued for 24 hours to obtain a polydopamine solution. It is also possible to accelerate the polymerization of dopamine by stirring vigorously under the heating condition of 60°C and high-speed stirring condition of 300r / min for 0.5h;

[0042] B. Preparation of Graphene Oxide Dispersion

[0043] Monolayer graphene oxide powder was prepared by the Hummers method. After the prepar...

Embodiment 2

[0053] A. Synthesis of polydopamine:

[0054] Dissolve 0.5 g of dopamine hydrochloride in 10 ml of deionized water and stir with a glass rod until completely dissolved. Then, mix 40ml of ethanol and 1ml of ammonia solution (25-28%) with 90ml of deionized water, stir magnetically at room temperature for 30 minutes, and slowly inject into the above solution, the color of the mixed solution turns light brown and gradually turns dark brown, The reaction continued for 24 hours to obtain a polydopamine solution. It is also possible to accelerate the polymerization of dopamine by stirring vigorously under the heating condition of 60°C and high-speed stirring condition of 300r / min for 0.5h;

[0055] B. Preparation of Graphene Oxide Dispersion

[0056] Monolayer graphene oxide powder was prepared by the Hummers method. After the preparation is completed, weigh 20 mg of graphene oxide powder, disperse it in 10 ml of deionized water, and carry out ultrasonic dispersion. The ultrasonic...

Embodiment 3

[0065] A. Synthesis of polydopamine:

[0066] Dissolve 0.5 g of dopamine hydrochloride in 10 ml of deionized water and stir with a glass rod until completely dissolved. Then, mix 40ml of ethanol and 1ml of ammonia solution (25-28%) with 90ml of deionized water, stir magnetically at room temperature for 30 minutes, and slowly inject into the above solution, the color of the mixed solution turns light brown and gradually turns dark brown, The reaction continued for 24 hours to obtain a polydopamine solution. It is also possible to accelerate the polymerization of dopamine by stirring vigorously under the heating condition of 60°C and high-speed stirring condition of 300r / min for 0.5h;

[0067] B. Preparation of Graphene Oxide Dispersion

[0068] Monolayer graphene oxide powder was prepared by the Hummers method. After the preparation is completed, weigh 20 mg of graphene oxide powder, disperse it in 10 ml of deionized water, and carry out ultrasonic dispersion. The ultrasonic...

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Abstract

The invention discloses a hydrogel flexible strain sensor and a preparation method thereof. The preparation method comprises the following steps: 1, mixing and dissolving monomer acrylamide, calcium chloride, sodium caseinate and a polydopamine solution in deionized water to obtain a mixed solution; 2, adding a chemical cross-linking agent N, N '-methylene bisacrylamide into the mixed solution, stirring, adding a single-layer graphene oxide dispersion liquid, and stirring at room temperature to obtain a pre-polymerization solution; 3, adding an initiator and a catalyst into the pre-polymerization solution; 4, injecting the polymerization solution into a reaction mold to obtain hydrogel; and 5, cleaning and drying the hydrogel, installing a conductive copper electrode, and packaging to form the flexible strain sensor. The prepared hydrogel strain sensor has high stretchability, high sensitivity and adhesiveness, and can be directly attached to the skin of a human body to realize real-time monitoring of tiny or large-amplitude human motion.

Description

technical field [0001] The invention belongs to the technical field of polymer hydrogel, in particular to a preparation method of a flexible strain sensor of a hydrogel with high stretchability and high sensitivity. Background technique [0002] In recent years, with the increasing maturity of technologies such as the Internet of Things and artificial intelligence, flexible wearable devices have developed rapidly, and there is an increasing demand for flexible sensors, especially those with excellent properties such as high stretchability, ductility, and high sensitivity. sensor. Flexible sensors can be widely used in human health monitoring, human motion monitoring, human-computer interaction and other fields. Among them, the strain sensor in the flexible sensor is widely used as a basic sensor. Generally, flexible strain sensors can be based on different materials, but different materials have their own advantages and disadvantages in terms of mechanical and electrical p...

Claims

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Application Information

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IPC IPC(8): C08F289/00C08F283/00C08F220/56C08F222/38C08F2/44C08K3/04G01B7/16
CPCC08F2/44C08F283/00C08F289/00C08K3/042G01B7/18C08F220/56C08F222/385
Inventor 周剑卓凤玲段辉高刘侃颜凌波隆鑫欣
Owner SHENZHEN HAIPAI TECH
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