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Preparation method of flexible strain sensor based on nanocellulose-carbon nanotube/polyacrylamide conductive hydrogel

A technology of nano-cellulose and polyacrylamide, which is applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., to achieve high strength, beneficial mechanical properties, and improve electrical conductivity and electrochemical properties

Active Publication Date: 2019-08-30
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] There is no flexible strain sensor based on TEMPO nanocellulose-carbon nanotubes / polyacrylamide conductive hydrogel with high flexibility, high mechanical properties and high sensitivity in the market

Method used

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  • Preparation method of flexible strain sensor based on nanocellulose-carbon nanotube/polyacrylamide conductive hydrogel
  • Preparation method of flexible strain sensor based on nanocellulose-carbon nanotube/polyacrylamide conductive hydrogel
  • Preparation method of flexible strain sensor based on nanocellulose-carbon nanotube/polyacrylamide conductive hydrogel

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Embodiment 1

[0052] Step 1, the preparation of TEMPO nano-cellulose suspension, its concrete method step comprises:

[0053] (1) Weigh 0.033g of TEMPO and 0.33g of NaBr into 400mL of deionized water in sequence, and stir the above mixture fully with a magnetic stirrer at 10°C. After TEMPO and NaBr are completely dissolved, add 2 g of pulverized bleached wood pulp fiber powder to the reaction system; (2) stir vigorously until the cellulose is evenly dispersed, then add 21 g of NaClO to the system, and add 0.5 mol L -1 NaOH solution to control the pH of the reaction system at about 10; (3) filter the oxidized cellulose after reacting for 6 hours, and wash with deionized water for 3 to 5 times to obtain oxidized cellulose; (4) use deionized water to filter the oxidized cellulose Supplemented into 2mg ml -1 In an ice-water bath, oxidized cellulose was peeled off into cellulose nanofibers by ultrasonication at 300W power for 5 minutes, and the prepared fiber nanofiber suspension was stored in ...

Embodiment 2

[0061] Step 1, the preparation of TEMPO nano-cellulose suspension, its concrete method step comprises:

[0062] (1) Weigh 0.033g of TEMPO and 0.33g of NaBr into 400mL of deionized water in sequence, and stir the above mixture fully with a magnetic stirrer at 10°C. After TEMPO and NaBr are completely dissolved, add 2 g of pulverized bleached wood pulp fiber powder to the reaction system; (2) stir vigorously until the cellulose is evenly dispersed, then add 21 g of NaClO to the system, and add 0.5 mol L -1 NaOH solution to control the pH of the reaction system at about 10; (3) filter the oxidized cellulose after reacting for 6 hours, and wash with deionized water for 3 to 5 times to obtain oxidized cellulose; (4) use deionized water to filter the oxidized cellulose Supplemented into 2mg ml -1 In an ice-water bath, oxidized cellulose was peeled off into cellulose nanofibers by ultrasonication at 300W power for 5 minutes, and the prepared fiber nanofiber suspension was stored in ...

Embodiment 3

[0070] Step 1, the preparation of TEMPO nano-cellulose suspension, its concrete method step comprises:

[0071] (1) Weigh 0.033g of TEMPO and 0.33g of NaBr into 400mL of deionized water in sequence, and stir the above mixture fully with a magnetic stirrer at 10°C. After TEMPO and NaBr are completely dissolved, add 2 g of pulverized bleached wood pulp fiber powder to the reaction system; (2) stir vigorously until the cellulose is evenly dispersed, then add 21 g of NaClO to the system, and add 0.5 mol L -1 NaOH solution to control the pH of the reaction system at about 10; (3) filter the oxidized cellulose after reacting for 6 hours, and wash with deionized water for 3 to 5 times to obtain oxidized cellulose; (4) use deionized water to filter the oxidized cellulose Supplemented into 2mg ml -1 In an ice-water bath, oxidized cellulose was peeled off into cellulose nanofibers by ultrasonication at 300W power for 5 minutes, and the prepared fiber nanofiber suspension was stored in ...

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Abstract

The invention discloses a flexible strain sensor based on nanocellulose-carbon nanotube / polyacrylamide conductive hydrogel. The preparation method of the flexible strain sensor comprises the followingsteps: (1) preparing a TEMPO nanocellulose suspension; (2) preparing a carbon nanotube dispersion; (3) preparing TEMPO nanocellulose-carbon nanotube / polyacrylamide conductive hydrogel; and (4) attaching two separate copper electrodes to both sides of the hydrogel so as to obtain the flexible strain sensor based on the nanocellulose-carbon nanotube / polyacrylamide conductive hydrogel. The sensor has high flexibility, stretchability, high mechanical properties, high electrical conductivity and strain sensitivity.

Description

technical field [0001] The invention relates to a preparation method of a flexible strain sensor based on nanocellulose-carbon nanotube / polyacrylamide conductive hydrogel, and belongs to the technical field of polymer composite conductive materials. Background technique [0002] Polyacrylamide (PAM) is a water-soluble organic polymer, which is widely used in the preparation of biomedical materials such as hydrogels due to its good mechanical properties and biocompatibility. A series of hydrogels developed with it have been widely used in adsorbents, water-absorbing and water-retaining agents, and compounded into intelligent hydrogels. PAM hydrogel is added with TEMPO (2,2,6,6-tetramethylpiperidinium oxide) nanocellulose to enhance mechanical properties, and PAM hydrogel is added with conductive materials (polyaniline, polypyrrole, carbon nanotubes, carbon nano tubes, etc.) to form a conductive gel. [0003] The carbon atoms of carbon nanotubes (CNTs) are bonded by carbon-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L33/26C08L1/04C08K3/04C08B15/02C08F220/56C08F222/38G01B7/16
CPCC08J3/075C08B15/02C08F220/56G01B7/18C08J2333/26C08J2401/04C08K3/041C08K2201/001C08F222/385
Inventor 韩景泉丁琴琴陆亚岳一莹
Owner NANJING FORESTRY UNIV
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