Gallium/sodium alginate/polyacrylamide composite hydrogel material as well as preparation method and application thereof

A polyacrylamide and composite hydrogel technology, which is applied in the application field of flexible strain sensors, can solve the problems of poor fit and low tensile properties of hydrogels, and achieves improved toughness and recoverability, high toughness, Effective stress dispersion effect

Active Publication Date: 2022-07-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compatibility issues between hydrophobic conductive polymers and hydrophilic hydrogels lead to low tensile properties of hydrogels, while the inherent rigidity of conductive nanoparticles leads to increased elastic modulus of hydrogels, making them Poor fit to human skin

Method used

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  • Gallium/sodium alginate/polyacrylamide composite hydrogel material as well as preparation method and application thereof
  • Gallium/sodium alginate/polyacrylamide composite hydrogel material as well as preparation method and application thereof
  • Gallium/sodium alginate/polyacrylamide composite hydrogel material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First dissolve 1.5g acrylamide in 8.6mL deionized water, then add 11.4mL sodium alginate aqueous solution (2%, m / m), stir well, and finally add 0.005g crosslinking agent N,N- Methylene bisacrylamide, 45 μL of accelerator tetramethylethylenediamine and 0.006 g of initiator ammonium persulfate were poured into a mold and heated at 55° C. for 6 hours to form a hydrogel. Then, the hydrogel was soaked in 0.15 M CaCl 2 In the solution for 12 hours, the sodium alginate / polyacrylamide composite hydrogel was obtained. (The molar ratio of sodium alginate to acrylamide is 1:20)

Embodiment 2

[0032] First dissolve 1.5g of acrylamide in 8.6mL of deionized water, then add 15mg of liquid metal gallium, sonicate, then add 11.4mL of sodium alginate in water (2%, m / m), stir well, and finally in an ice-water bath Add 0.005g crosslinker N,N-methylenebisacrylamide, 45μL accelerator tetramethylethylenediamine and 0.006g initiator ammonium persulfate, pour it into a mold, and heat it at 55°C for 6 hours to form a hydrogel glue. Then, the hydrogel was soaked in 0.15 M CaCl 2In the solution for 12 hours, the gallium / sodium alginate / polyacrylamide composite hydrogel was obtained. (The molar ratio of sodium alginate to acrylamide is 1:20)

Embodiment 3

[0034] First, 1.5 g of acrylamide was dissolved in 10.9 mL of deionized water, then 15 mg of liquid metal gallium was added, sonicated, followed by 9.1 mL of sodium alginate in water (2.5%, m / m), stirred well, and finally in an ice-water bath Add 0.005g crosslinking agent N,N-methylenebisacrylamide, 45μL accelerator tetramethylethylenediamine and 0.006g initiator ammonium persulfate, pour it into the mold, and heat it at 45°C for 4 hours to form a hydrogel glue. Then, the hydrogel was soaked in 0.15 M CaCl 2 In the solution for 18 hours, the gallium / sodium alginate / polyacrylamide composite hydrogel was obtained. (The molar ratio of sodium alginate to acrylamide is 1:20)

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Abstract

The invention relates to a gallium / sodium alginate / polyacrylamide composite hydrogel material which is prepared by the following steps: dissolving 1.5-2.84 g of acrylamide in 3.5-13.5 mL of deionized water, then adding liquid metal gallium, carrying out ultrasonic treatment, then adding 2-3.5% of an aqueous solution of sodium alginate at m / m, uniformly stirring, finally adding 0.005 g of a cross-linking agent N, N-dimethyl formamide into an ice-water bath, and carrying out ultrasonic treatment for 0.5-1.5 hours at the temperature of 20-30 DEG C; the preparation method comprises the following steps: adding sodium alginate and polyacrylamide into a mold, pouring the mixture into the mold, heating at 40-55 DEG C for 4-12 hours to form hydrogel, soaking the hydrogel in a 0.15 M CaCl2 solution for 12-24 hours to obtain gallium / sodium alginate / polyacrylamide composite hydrogel, and ensuring that the molar ratio of sodium alginate to acrylamide is 1: (15-30); the addition amount of gallium is 10 to 30 mg; the material is applied as a flexible strain sensor, has extremely high strain sensitivity, and is used in human health monitoring, man-machine communication and artificial tactile processing systems. The structure of the device is as follows:

Description

technical field [0001] The invention relates to a gallium / sodium alginate / polyacrylamide composite hydrogel material and a preparation method thereof, and its application as a flexible strain sensor. Background technique [0002] In recent years, flexible strain sensors have attracted much attention because strain sensors can convert different external stimuli into monitored electrical signals and have skin-like softness, which are used in human health monitoring, human-computer communication, artificial nerves and tactile processing There are good application prospects in the system. [0003] At present, the fabrication of strain sensors is mainly based on polymer substrates (such as dimethylsiloxane and polyurethane) as carriers, and conductive materials are embedded or deposited on the surface of the polymer substrates. However, the high modulus and low elasticity of the carrier make it poorly fitted to the skin and unable to adapt to the complex mechanical changes of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J3/24C08L51/10C08L5/04C08F292/00C08F220/56G01B7/16
CPCC08J3/075C08J3/246C08F292/00G01B7/16C08J2351/10C08J2405/04C08F220/56
Inventor 魏芸曹庆龙
Owner BEIJING UNIV OF CHEM TECH
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