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 e

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

Example Embodiment

[0030] Example 1. Novel photothermal induced self-repairing precious metal nanocomposite hydrogel.

[0031] The novel photothermal induced self-healing noble metal nanocomposite hydrogel of this embodiment uses dynamic noble metal-sulfur coordination bonds as the self-healing body. It has a uniform network structure, that is, the monomer undergoes a uniform polymerization reaction during the polymerization process. So that the hydrogel has good stretchability and strength, its mechanical strength can reach MPa level, and the tensile strain can reach more than 20 times; it has good resistance to notch sensitivity, that is, there are notches on the surface of the hydrogel Or when cracked, it still has good tensile properties and exhibits unique anti-notch sensitivity; it uses the dynamic coordination bond of noble metal and sulfur and the good photothermal performance of noble metal, which shows good performance under the stimulation of 808 nm infrared laser Self-healing performanc...

Example Embodiment

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

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

[0034] ⑴. Preparation of precious metal nanoparticle dispersion: prepare solution 1: 0.3 mmol / L chloroauric acid aqueous solution and solution 2: 40 mmol / L trisodium citrate aqueous solution, then take 50 mL of solution 1 and heat to boiling, and then take 1 mL Solution 2 is added to solution 1 to keep boiling reaction for 5 minutes, and after natural cooling, it is centrifuged and washed with distilled water and alcohol for 3 times to obtain a precious metal nanoparticle dispersion;

[0035] ⑵ Preparation of precious metal nanowire dispersion: take 0.1 g of chloroauric acid and 10 mL of oleylamine i...

Example Embodiment

[0037] Example 3. Modification of precious metal nanomaterials.

[0038] Weigh 0.02% of the total mass of the precious metal nano-material dispersion (using particle morphology dispersion) and add the functional modification to the precious metal nano-material dispersion, stir well and ultrasonically mix for 20 minutes to obtain a functionalized precious metal nano-material; The functional modification body adopts water-soluble thiolate organic small molecules, and the small molecular structure contains polymerizable carbon-carbon double bonds, such as allyl mercaptan.

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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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