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Core/shell type nano-silver-based composite material as well as preparation method and antibacterial application thereof

A composite material and nano-silver technology, which is applied in the fields of application, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of easy aggregation of nano-silver, insufficient anti-oxidation, and poor antibacterial properties, and achieve good dispersion and excellent Antioxidant performance, low cost effect

Pending Publication Date: 2022-08-05
广州白云山维一实业股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to, aim at the above-mentioned deficiency of prior art, provide a kind of core / shell type nano-silver-based composite material and its preparation method and antibacterial application, have avoided independent nano-cerium dioxide particle antibacterial property poor and independent nano-silver Problems such as easy agglomeration and insufficient oxidation resistance

Method used

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  • Core/shell type nano-silver-based composite material as well as preparation method and antibacterial application thereof
  • Core/shell type nano-silver-based composite material as well as preparation method and antibacterial application thereof
  • Core/shell type nano-silver-based composite material as well as preparation method and antibacterial application thereof

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Effect test

Embodiment 1

[0041] Embodiment 1: The core / shell nano-silver matrix composite material provided in this example, its preparation method and antibacterial application, the core / shell type nano-silver matrix composite material is a spherical nano-cerium dioxide (n-CeO 2 ) as the substrate, the nano-silver is loaded on the spherical nano-ceria (n-CeO 2 ) surface to obtain nano-silver@ceria composites with silver loaded on the surface, namely core / shell nano-silver matrix composites, in which spherical nano-ceria (n-CeO 2 ) is prepared by the alcohol thermal method. Specific methods include:

[0042] 1) Add 2.0 g of cerium nitrate, 2 mL of deionized water, 2 mL of citric acid, and 0.5 g of polyvinylpyrrolidone to 52 mL of ethylene glycol, and stir for 30 min to obtain solution A;

[0043] 2) Transfer the solution A to the polytetrafluoroethylene lining, then load it into a stainless steel reactor and react at a high temperature of 180 ° C for 200 min, wait for the solution to be cooled to ro...

Embodiment 2

[0049] Embodiment 2: The core / shell nano-silver-based composite material and its preparation method and antibacterial application provided in this embodiment are basically the same as embodiment 1, and the differences are:

[0050] 1) 1.517g of cerium nitrate, 1.5mL of deionized water, 3.0mL of citric acid, 0.7g of polyvinylpyrrolidone, were added to 55mL of ethylene glycol, and stirred for 30min to obtain solution A;

[0051] 2) Transfer the solution A to the polytetrafluoroethylene lining, then load it into a stainless steel reactor and react at a high temperature of 120 ° C for 240 min, wait for the solution to be cooled to room temperature, pour off the upper yellow-brown clear liquid, and obtain a purple precipitate B;

[0052] 3) Transfer the precipitate B to a centrifuge bottle, wash it three times with distilled water and once with ethanol, and then put it into a 50° C. oven to dry, and obtain a precipitate C after drying is complete.

[0053] 4) Transfer the precipita...

Embodiment 3

[0055] Embodiment 3: The core / shell nano-silver-based composite material and its preparation method and antibacterial application provided by this embodiment are basically the same as embodiment 1, and the differences are:

[0056] 1) Add 1.5 g of cerium nitrate, 2 mL of deionized water, 2 mL of citric acid, and 0.4 g of polyvinylpyrrolidone to 50 mL of ethylene glycol, and stir for 30 min to obtain solution A;

[0057] 2) Transfer the solution A to the polytetrafluoroethylene lining, then load it into a stainless steel reaction kettle and react at a high temperature of 140 ° C for 200 min, wait for the solution to be cooled to room temperature, pour off the upper yellow-brown clear liquid, and obtain a purple precipitate B;

[0058] 3) Transfer the precipitate B to a centrifuge bottle, wash it three times with distilled water and once with ethanol, and then put it into a 60° C. oven to dry, and obtain a precipitate C after drying is complete.

[0059] 4) Transfer the precipit...

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Abstract

The invention discloses a core / shell type nano-silver-based composite material as well as a preparation method and antibacterial application thereof, the core / shell type nano-silver-based composite material is a nano-silver-cerium dioxide composite material with silver loaded on the surface, which is obtained by taking spherical nano-cerium dioxide (n-CeO2) as a substrate and loading nano-silver on the surface of the spherical nano-cerium dioxide through a photodeposition method, wherein the spherical nano cerium dioxide is prepared by an alcohol thermal method. Compared with the prior art, the preparation method has the advantages that the problems that the antibacterial property of single nano cerium dioxide particles is poor, the antibacterial property is sharply reduced and the oxidation resistance is not excellent enough if single nano silver is easy to agglomerate and the like are solved; the core / shell type nano-silver-based composite material has the advantages of high-efficiency antibacterial property, excellent physical and chemical stability, excellent photocatalytic property, excellent oxidation-reduction property and the like on escherichia coli, staphylococcus aureus and the like.

Description

technical field [0001] The invention relates to the technical field of antibacterial materials, in particular to a core / shell type nano-silver matrix composite material, a preparation method and antibacterial application thereof. Background technique [0002] Nano-silver Ag is one of the more mature antibacterial materials at present. There are many research results, and it has been used in clinical practice. It has the characteristics of broad spectrum, high efficiency and not easy to cause drug resistance to different pathogenic bacteria. Studies have shown that The shape effect of the antibacterial activity of various anisotropic silver nanocrystals on various bacteria, that is, the different shapes of silver nanocrystals have different antibacterial activities due to different crystallographic orientations. The sterilization mechanism of Ag is: Ag ions enter cells and combine with DNA molecules, replacing the hydrogen bonds in the double helix structure, which eventually...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/16A01N25/08A01P1/00B01J23/66B01J35/08C09K15/02
CPCA01N59/16A01N25/08B01J23/66C09K15/02B01J35/396B01J35/397B01J35/51B01J35/39Y02A50/30
Inventor 周飞燕刘意李梓权黄明郑淑彦
Owner 广州白云山维一实业股份有限公司
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