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Novel photo-irradiation induced self-repairing precious metal nano composite hydrogel and preparation method thereof

A photothermal-induced, nanocomposite technology, applied in the field of nanomaterials, can solve the problems of no nanocomposite hydrogel bonding, high repair time and repair efficiency, and achieve good anti-notch sensitivity performance, good self-healing performance, good stretchability performance effect

Inactive Publication Date: 2016-09-21
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these self-healing methods are still relatively high in repair time and repair efficiency, and so far, have not been combined with high-strength nanocomposite hydrogels.

Method used

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  • Novel photo-irradiation induced self-repairing precious metal nano composite hydrogel and preparation method thereof
  • Novel photo-irradiation induced self-repairing precious metal nano composite hydrogel and preparation method thereof
  • Novel photo-irradiation induced self-repairing precious metal nano composite hydrogel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1. Novel photothermally induced self-healing noble metal nanocomposite hydrogel.

[0031] The novel photothermally induced self-healing noble metal nanocomposite hydrogel of this embodiment uses the dynamic noble metal-sulfur coordination bond as the self-healing main body, and has a uniform network structure, that is, the homogeneous polymerization reaction of monomers occurs during the polymerization process. So that the hydrogel has good stretchability and strength, its mechanical strength can reach MPa level, and its tensile strain can reach more than 20 times; it has good anti-notch sensitivity performance, that is, there is a gap on the surface of the hydrogel Or cracks, it still has good tensile properties, showing unique anti-notch sensitivity; it uses the dynamic coordination bonds between noble metals and sulfur and the good photothermal properties of noble metals, and shows good performance under the stimulation of 808 nm infrared laser self-healing p...

Embodiment 2

[0032] Example 2. Preparation of noble metal nanomaterial dispersion.

[0033] There are three trial forms of noble metal nanomaterial dispersions: zero-dimensional noble metal nanoparticle morphology dispersion, one-dimensional noble metal nanowire morphology dispersion or two-dimensional noble metal nanosheet morphology dispersion.

[0034] (1) Preparation of noble metal nanoparticle dispersion: Prepare solution 1: 0.3 mmol / L chloroauric acid aqueous solution and solution 2: 40 mmol / L trisodium citrate aqueous solution respectively, then take 50 mL of solution 1 and heat to boiling, then take 1 mL Solution 2 was added to solution 1 to keep boiling for 5 minutes, and after natural cooling, it was centrifuged and washed with distilled water and alcohol for 3 times to obtain the precious metal nanoparticle dispersion;

[0035] (2) Preparation of noble metal nanowire dispersion: Take 0.1 g of chloroauric acid and 10 mL of oleylamine in 1 mL of n-hexane and mix them uniformly in 1 ...

Embodiment 3

[0037] Embodiment 3. Modification of noble metal nanomaterials.

[0038] Weigh 0.02% of the total mass of the noble metal nanomaterial dispersion (using the particle shape dispersion) as a functional modifier and add it to the noble metal nanomaterial dispersion, fully stir and ultrasonically mix for 20 minutes to obtain surface functionalized noble metal nanomaterials; Among them, the functional modifier adopts water-soluble thiolate organic small molecules, and the small molecular structure contains polymerizable carbon-carbon double bonds, such as allyl thiol.

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Abstract

The invention discloses novel photo-irradiation induced self-repairing precious metal nano composite hydrogel. According to the hydrogel, a dynamic precious metal-sulfur coordination bond serves as a self-healing body which has a uniform mesh structure, that is, monomer has uniform polymerization reaction in the polymerization process, and accordingly the hydrogel has good stretchability and strength. The hydrogel has good notch sensitivity prevention capacity, that is, when notches or cracks exist in the surface of the hydrogel, hydrogel still has good stretchability. By means of the precious metal-sulfur coordination bond and good light-heat properties of precious metal, the hydrogel shows good self-repairing performance under stimulation of infrared laser.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a novel photothermal-induced self-repairing noble metal nanocomposite hydrogel and a preparation method thereof. Background technique [0002] Hydrogel is a water-soluble polymer with a three-dimensional cross-linked network structure formed by certain chemical or physical cross-linking with water as the dispersion medium. As a feature of softness and high water content, hydrogels have been widely used in sensing and detection, drug release, actuators, and tissue engineering in recent years. Compared with other "hard" materials, hydrogels can respond well to various external stimuli. Ordinary polymer hydrogels generally use chemical small molecules as cross-linking agents in the preparation process, and the polymerization process is often dominated by random polymerization, resulting in poor dispersion of cross-linking points in the cross-linked network, resulting in The ...

Claims

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Application Information

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IPC IPC(8): C08F120/56C08F2/44C08K9/04C08K3/08
CPCC08F2/44C08F120/56C08K3/08C08K9/04C08K2003/0831C08K2201/011
Inventor 从怀萍张坦秦海利
Owner HEFEI UNIV OF TECH
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