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Preparation method and application of oriented conductive low-temperature-resistant hydrogel

A conductive hydrogel, hydrogel technology, applied in electromagnetic measurement devices, electric/magnetic solid deformation measurement, etc., can solve the problem of weak mechanical properties and electrical conductivity of hydrogels, affecting durability and practical applications, limiting applications, etc. problems, to achieve the effect of improving mechanical strength and application prospects, high sensitivity and stability, and easy gelation process

Active Publication Date: 2021-10-19
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional conductive hydrogel network is a three-dimensional network with a porous, disordered and uniform structure, which leads to weak mechanical properties and electrical conductivity of the hydrogel, which severely limits its application.
In addition, most hydrogels will lose water and freeze at subzero temperatures under complex environmental conditions, which will affect their durability and practical applications.

Method used

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  • Preparation method and application of oriented conductive low-temperature-resistant hydrogel
  • Preparation method and application of oriented conductive low-temperature-resistant hydrogel
  • Preparation method and application of oriented conductive low-temperature-resistant hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) First add 1g of LiF to 20mL of hydrochloric acid and stir for 5 minutes. 1g Ti 3 AlC 2 The above solution was added slowly and stirred at 35°C for 26 hours to obtain a black suspension. The acidic suspension was then washed with deionized water and centrifuged at 4500 rpm for 5 minutes until the pH of the supernatant reached 6.0. Then collect the sediment, add deionized water to the sediment, pass Ar into the dispersion for 10 minutes and sonicate for 1 hour, and add ice packs to keep the temperature low. Finally, centrifuge at 5000 rpm for 10 minutes and freeze-dry at -50°C for 3 days to obtain fluffy black powder A of MXene nanosheets.

[0019] 2) First, 6.25g of PVA powder was added to 42.75g of deionized water and vigorously stirred at 90°C for 6 hours to obtain a solution of 12.5wt% PVA. The black solid powder A prepared in the first step was added to deionized water to form a concentrated solution of 15mg / ml, and then ultrasonically passed through a cell pu...

Embodiment 2

[0022] 1) First add 1g of LiF to 20mL of hydrochloric acid and stir for 5 minutes. 1g Ti 3 AlC 2 The above solution was slowly added and stirred at 40 °C for 24 hours to obtain a black suspension. The acidic suspension was then washed with deionized water and centrifuged at 3500 rpm for 8 minutes until the pH of the supernatant reached 6.0. Then collect the sediment, add deionized water to the sediment, pass Ar into the dispersion for 20 minutes and sonicate for 1.5 hours, and add ice packs to keep the temperature low. Finally, centrifuge at 4500 rpm for 10 minutes and freeze-dry at -50°C for 3 days to obtain fluffy black powder A of MXene nanosheets.

[0023] 2) First, 5 g of PVA powder was added to 45 g of deionized water and vigorously stirred at 90° C. for 6 hours to obtain a 10 wt % PVA solution. The black solid powder A prepared in the first step was added to deionized water to form a concentrated solution of 15mg / ml, and then ultrasonically passed through a cell pul...

Embodiment 3

[0026] 1) First add 1g of LiF to 20mL of hydrochloric acid and stir for 5 minutes. 1g Ti 3 AlC 2 The above solution was added slowly and stirred at 35°C for 26 hours to obtain a black suspension. The acidic suspension was then washed with deionized water and centrifuged at 4500 rpm for 5 minutes until the pH of the supernatant reached 6.0. Then collect the sediment, add deionized water to the sediment, pass Ar into the dispersion for 10 minutes and sonicate for 1 hour, and add ice packs to keep the temperature low. Finally, centrifuge at 5000 rpm for 10 minutes and freeze-dry at -50°C for 3 days to obtain fluffy black powder A of MXene nanosheets.

[0027] 2) First, 6.25g of PVA powder was added to 42.75g of deionized water and vigorously stirred at 90°C for 6 hours to obtain a solution of 12.5wt% PVA. The black solid powder A prepared in the first step was added to deionized water to form a concentrated solution of 15mg / ml, and then ultrasonically passed through a cell pu...

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Abstract

The invention provides a preparation method and application of oriented conductive low-temperature-resistant hydrogel. The hydrogel has the characteristics of electrical conductivity, orientation, low temperature resistance, moisture retention performance and the like, and has application prospects in the aspect of oriented flexible devices in a complex environment. The hydrogel can be used for monitoring limb motions with large motion ranges, such as finger bending, wrist bending and finger pressing, and for muscle motions with small motion ranges, such as face motions and throat vibration. A strain sensor prepared from the hydrogel has high sensitivity and stability and has application prospects in the aspects of wearable electronic equipment, electronic skin, personalized medical detection, human-computer interfaces, signal monitoring and the like.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a method for preparing an oriented conductive low-temperature resistant hydrogel and its application in sensors. Background technique [0002] In recent years, hydrogel materials have developed most rapidly, which makes hydrogels have potential application prospects in biomedicine, electronic devices, artificial cartilage, and 3D printing of human organs. However, the hydrogel itself is non-conductive. When conductive nanomaterials are added to the hydrogel, it will endow it with the ability to conduct electricity and expand the application range of the hydrogel. Recently, wearable strain sensors based on conductive hydrogels have developed rapidly and showed good signal detection capabilities (Adv. Funct. Mater., 2019, 1901474). Wearable strain sensors have been extensively studied due to their excellent electronic properties, tunable mechanical properties...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/24C08L29/04C08K7/00C08K3/14C08K3/16C08K3/30G01B7/16
CPCC08J3/075C08J3/24G01B7/18C08J2329/04C08K7/00C08K3/14C08K2003/166C08K2003/3045C08K2201/001C08K2201/011
Inventor 林权冯钰斌马程远李洋关琳杨欣婷杨柏
Owner JILIN UNIV
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