Stretchable self-healing hydrogel flexible strain sensor and production method thereof

A strain sensor, hydrogel flexible technology, applied in instruments, measuring devices, force/torque/work measuring instruments, etc., can solve the problems of narrow operating temperature range, prone to brittle fracture, small sensitivity factor, etc., to achieve excellent The effect of frost resistance, high self-healing elongation, good performance

Active Publication Date: 2019-02-01
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the common problems of current flexible stretchable strain sensors, such as low stretchability, self-healing after breaking, narrow temperature range, narrow detection range, small sensitivity factor, and self-healing. Shortcomings such as prone to brittle fracture at low temperatures provide a cost-effective highly stretchable, self-healing, freeze-resistant hydrogel-based flexible strain sensor prepared by a one-step sol-gel method, which has good durability, The advantages of wide detection range, high sensitivity, and good repeatability can effectively broaden the practical application of flexible wearable devices

Method used

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  • Stretchable self-healing hydrogel flexible strain sensor and production method thereof
  • Stretchable self-healing hydrogel flexible strain sensor and production method thereof
  • Stretchable self-healing hydrogel flexible strain sensor and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Step (1): Dissolve 10 mg of sodium lauryl sulfate in 50 mL of deionized water, and suspend and disperse 25 mg of multi-walled carbon nanotubes (model: FT9101, outer diameter: 10-15 nm, the same below) in the above solution. After 60 minutes of ultrasonic dispersion in an ice bath, centrifuge at 11000 rpm, pour the supernatant into a beaker, and then add 5 mg of polyvinylpyrrolidone (model K16-18) to the supernatant, and repeat the above-mentioned ultrasonic and centrifugal operations. Obtain the supernatant, and add 1 mL of dimethylformamide and 2 mL of deionized water to the supernatant to obtain a functionalized multi-walled carbon nanotube solution;

[0048] Step (2). Dissolve 1.5 mL acrylic acid, 75 mg ammonium persulfate, 10 mg methylene bisacrylamide, 160 mg ferric nitrate nonahydrate, and 300 mg borax in 3 mL deionized water, stir evenly and ultrasonically disperse for 60 minutes to obtain a solution, marked as Precursor A;

[0049] Step (3), 3mL of 10% polyvinyl alc...

Embodiment 2

[0062] Step (1): Dissolve 5 mg of sodium lauryl sulfate in 50 mL of deionized water, and suspend and disperse 15 mg of multi-walled carbon nanotubes in the above solution. After ultrasonic dispersion for 60 minutes in an ice bath, centrifuge at 11000 rpm, and the supernatant Pour into a beaker, then add 2 mg of n-octyl-2-pyrrolidone to the supernatant, repeat the above-mentioned ultrasonic and centrifugal operations to obtain the supernatant, and add 1 mL of dimethylformamide and 2 mL to the supernatant. Ionized water to obtain functionalized multi-walled carbon nanotube solution;

[0063] Step (2): Dissolve 1 mL of acrylic acid, 15 mg of ammonium persulfate, 2 μL of glyoxal, 100 mg of ferric nitrate nonahydrate, and 100 mg of borax in 3 mL of deionized water, stir uniformly and ultrasonically disperse for 60 minutes to obtain a solution, which is marked as precursor A;

[0064] Step (3), 3mL of polyvinyl alcohol solution with a mass fraction of 8%, 0.5mL of glycerol, 10mg of funct...

Embodiment 3

[0069] Step (1): Dissolve 3 mg of sodium dodecylbenzene sulfonate in 50 mL of deionized water, and suspend and disperse 15 mg of multi-walled carbon nanotubes in the above solution, ultrasonically disperse for 60 minutes in an ice bath, and centrifuge at 11000 rpm to obtain Pour the supernatant liquid into a beaker, and then add 1 mg of cetyltrimethylammonium bromide to the supernatant, repeat the above-mentioned ultrasonic and centrifugal operations to obtain the supernatant, and add 1 mL of the supernatant to the supernatant. Methylformamide and 2mL deionized water to obtain a functionalized multi-walled carbon nanotube solution;

[0070] Step (2). Dissolve 0.5 mL of acrylic acid, 25 mg of ammonium persulfate, 5 mg of methylene bisacrylamide, 100 mg of ferric nitrate nonahydrate, and 100 mg of borax in 3 mL of deionized water, stir evenly and ultrasonically disperse for 60 minutes to obtain a solution, which is marked as Precursor A;

[0071] Step (3), 3mL of polyvinyl alcohol s...

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Abstract

The invention discloses a stretchable self-healing hydrogel flexible strain sensor. A self-healing hydrogel with a high stretchability is obtained by a one-step sol-gel technology, and the multifunctional flexible strain sensor is obtained by packaging using an adhesive tape. The hydrogel-based flexible strain sensor has a high sensitivity factor, and can be used for detecting the tensile strain and the compressive stress; and real-time detection of small strenuous human exercises is achieved due to the high stretchability and the low hysteresis behavior. The interaction of unique coordinationbonds and hydrogen bonds in the hydrogel make the sensor have a short self-healing time and a high self-healing efficiency, so the problems of damages and no recovery after tensile failure of flexible sensors are solved. The flexible sensor designed in the invention has the advantages of simple preparation process, time and labor saving and excellent performances, and can be widely applied to thefields of real-time health monitoring, flexible robots, clinical diagnosis, flexible electronic skins and smart home products.

Description

Technical field [0001] The invention relates to a stretchable and self-healing hydrogel flexible strain sensor and a preparation method thereof, and the application of the flexible strain sensor in the detection of tensile strain, compressive stress and external force frequency, in particular in real-time health monitoring, Clinical physiotherapy, self-healing devices, flexible robots, electronic skin and many other applications. Background technique [0002] In recent years, the rapid development of the Internet of Things, human-computer interaction, artificial intelligence and other industries has made the basic research and application market of flexible wearable devices continue to expand. Flexible strain sensors have gradually become the leader of flexible wearable products due to their low cost of preparation, simple conduction mechanism, and large-scale mass production. Under normal circumstances, although the metal semiconductor-based flexible strain sensor has a high se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L65/00C08K9/04C08J3/075C08J3/24C08F291/14C08F220/06C08F2/44G01B21/32G01L5/00
CPCC08F2/44C08F261/04C08F289/00C08J3/075C08J3/246C08J2329/04C08J2465/00C08K9/04C08K9/08C08K2201/011C08K3/041G01B21/32G01L5/00C08F220/06
Inventor 董晓臣葛刚邵进军司伟丽黄维
Owner NANJING UNIV OF TECH
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