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Preparation method of a magnetically induced self-healing nanocomposite hydrogel

A nanocomposite and self-repairing technology, applied in the field of nanomaterials, can solve the problems that the mechanical properties cannot be significantly improved, and achieve the effects of novel structure, dense cross-linked network, and high tensile stress and strain

Active Publication Date: 2019-08-30
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the magnetic nanoparticles are physically doped into the hydrogel, and the mechanical properties cannot be significantly improved. At the same time, there are very few hydrogels that induce self-healing in an external magnetic field.

Method used

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  • Preparation method of a magnetically induced self-healing nanocomposite hydrogel
  • Preparation method of a magnetically induced self-healing nanocomposite hydrogel
  • Preparation method of a magnetically induced self-healing nanocomposite hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Add 1.35g of ferric chloride hexahydrate, 3.6g of anhydrous sodium acetate and 1g of polyvinylpyrrolidone into 40ml of ethylene glycol, stir magnetically for 30 minutes to obtain a uniform yellow mixed solution, and then pour it into a 50ml volume of polyfour In a vinyl fluoride container, react at a high temperature of 200°C for 12 hours, cool to room temperature, and successively wash with ethanol and water to obtain magnetic nanoparticles, and dry them naturally for use.

[0030] 2. Pass ammonia gas into the ethanol until it is saturated, disperse 10 mg of the magnetic nanoparticles (i.e. ferric oxide) prepared in step 1 in 30 ml of ethanol (10% ammonia gas) containing saturated ammonia gas, and mechanically stir Disperse evenly, then add 300 μ L concentration of 0.2mol / L chloroauric acid hydrate aqueous solution, mix and stir for 2 hours, the noble metal nanomaterial grows on the surface of the magnetic nanoparticle; this step synthesizes the metal nanoparticle by...

Embodiment 2

[0037] 1. Add 1.35g of ferric chloride hexahydrate, 3.6g of anhydrous sodium acetate and 1g of polyvinylpyrrolidone into 40ml of ethylene glycol, stir magnetically for 30 minutes to obtain a uniform yellow mixed solution, and then pour it into a 50ml volume of polyfour In a vinyl fluoride container, react at a high temperature of 200°C for 12 hours, cool to room temperature, and successively wash with ethanol and water to obtain magnetic nanoparticles, and dry them naturally for use.

[0038] 2. Pass ammonia gas into ethanol until it is saturated, disperse 20 mg of magnetic nanoparticles (i.e. ferric oxide) prepared in step 1 in 30 ml of ethanol (10% ammonia gas) containing saturated ammonia gas, and mechanically stir Disperse evenly, then add 600 μL of 0.2mol / L aqueous chloroauric acid tetrahydrate solution, mix and stir for 2 hours, the noble metal nanomaterials grow on the surface of the magnetic nanoparticles; this step synthesizes metal nanoparticles by reducing the noble ...

Embodiment 3

[0045] 1. Add 1.35g of ferric chloride hexahydrate, 3.6g of anhydrous sodium acetate and 1g of polyvinylpyrrolidone into 40ml of ethylene glycol, stir magnetically for 30 minutes to obtain a uniform yellow mixed solution, and then pour it into a 50ml volume of polyfour In a vinyl fluoride container, react at a high temperature of 200°C for 12 hours, cool to room temperature, and successively wash with ethanol and water to obtain magnetic nanoparticles, and dry them naturally for use.

[0046] 2. Disperse 10 mg of the magnetic nanoparticles obtained in step 1 in deionized water, then add the functional modifier allyl thiol, and perform ultrasonic treatment at room temperature for 5-10 minutes to obtain a surface-modified nanoparticle composite; the allyl thiol The added mass is 0.02% of the mass of the magnetic nanoparticle dispersion liquid.

[0047] 3. Under nitrogen protection, the monomer acrylamide and the initiator potassium persulfate were sequentially added to the surfa...

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Abstract

The invention discloses a preparation method of a magnetically induced self-repair nanometer composite hydrogel. A nanocomposite material with a metal nano-material grows on the surface of magnetic nanometer particles is used as a cross-linking agent, and the hydrogel employs magnetic nanometer particles which produce heat that drives precious metal-sulfur coordination bond to dynamically vibratein an alternating magnetic field as a healing main body; furtherly, the precious metal nanoparticles flourishingly grow on the surface of magnetic nanometer particles by an electrostatic action, the structure is novel, many crosslinking positions are provided, and accordingly, the hydrogel has dense crosslinking network and high stretching stress-strain; the magnetic nanometer particles can respond in the magnetic field and induce self-healing, and the product has good application prospects in the fields of anti-fatigue materials, biological medicines, tissue engineering and the like.

Description

technical field [0001] The invention relates to a preparation method of a magnetically induced self-repairing nanocomposite hydrogel, belonging to the technical field of nanomaterials. Background technique [0002] Hydrogel is a polymer material that is hydrophilic but insoluble in water and has a three-dimensional network structure. It has attracted the attention of material science and biomedical workers because of its unique water absorption and good biocompatibility. , has been widely used and researched. In recent years, it is mainly used in sensing and detection, medicine release, artificial muscles and other fields. Most of the hydrogels synthesized by conventional methods inevitably exhibit limited disadvantages of poor mechanical strength, poor toughness, and low stretchability, which seriously limit their practical applications in the above fields. Japanese scientist T. Takehisa first proposed nanocomposite hydrogel in 2002, which uses nanoparticles (clay flakes)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/56C08F2/44C08K9/04C08K3/22C08K3/08
Inventor 从怀萍刘萍秦海利燕宇陈传瑞
Owner HEFEI UNIV OF TECH
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