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A green method for preparing silver nanowires with high aspect ratio by composite soft template method

A high aspect ratio, silver nanowire technology, applied in the field of preparation of noble metal nanomaterials, can solve the problems of many reaction by-products, high energy consumption, low yield, etc., and achieve good biocompatibility

Active Publication Date: 2022-04-12
江苏汇诚医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the methods for preparing silver nanowires by means of the soft template method use organic reagents such as ethylene glycol and glycerin as solvents, and reduce the mixed solution of silver salt and polyvinylpyrrolidone (PVP) under high temperature (greater than 160 °C) conditions. Preparation of nanomaterials, the preparation process is complex, high energy consumption, and many reaction by-products, low yield
[0005] Gallic acid (3,4,5-trihydroxybenzoic acid, formula C 7 h 6 o 5 ) belongs to polyphenolic compounds, which widely exist in plants such as Rhubarb palmatum, Eucalyptus eucalyptus, dogwood, etc. It has good antioxidant activity and is also a good green reducing agent, and it is used in silver nanowires with high aspect ratio There are few reports on the preparation methods of

Method used

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  • A green method for preparing silver nanowires with high aspect ratio by composite soft template method
  • A green method for preparing silver nanowires with high aspect ratio by composite soft template method
  • A green method for preparing silver nanowires with high aspect ratio by composite soft template method

Examples

Experimental program
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Effect test

Embodiment 1

[0042] 1) Under stirring conditions, weigh 30.0 g of polyvinyl alcohol (polymerization degree is 1700, alcoholysis degree is 98%) and slowly add it into 900 mL of deionized water at 25±2°C, fully stir and disperse for 15 minutes, then gradually increase the temperature Incubate at 95°C for 30 minutes, cool naturally after the polyvinyl alcohol is completely dissolved, then set the volume to 1000 mL, and prepare a polyvinyl alcohol aqueous solution with a mass concentration of 3.0%.

[0043] Weigh 11.8 g of succinic acid in 100 mL of deionized water, and dissolve to obtain an aqueous solution of succinic acid.

[0044] Under the condition of stirring, add 100 mL of polyvinyl alcohol solution to the aqueous solution of succinic acid, and after mixing thoroughly, set the volume to 1000 mL, adjust its pH value to 5.4, and obtain the mixed soft template of succinic acid-polyvinyl alcohol solution.

[0045] Weigh 3.398 g of silver nitrate and dissolve it in 100 mL of deionized wate...

Embodiment 2

[0050] 1) Under the condition of stirring, weigh 10.0 g of polyvinyl alcohol buffer (the degree of polymerization is 1800, the degree of alcoholysis is 96%) and slowly add it into 900 mL of deionized water at 25±2°C, stir and disperse for 10 minutes, gradually Raise the temperature to 95°C and keep it warm for 20 minutes. After the polyvinyl alcohol is completely dissolved, cool it down naturally, then set the volume to 1000 mL, and prepare a polyvinyl alcohol aqueous solution with a mass concentration of 1.0% for use.

[0051] Weigh 13.2 g of glutaric acid in 100 mL of deionized water, and dissolve to obtain glutaric acid aqueous solution. Oxalic acid can also be substituted for glutaric acid in this example.

[0052] Under the condition of stirring, add 100 mL of polyvinyl alcohol solution to the glutaric acid aqueous solution, after mixing thoroughly, set the volume to 1000 mL, adjust its pH to 5.2, and obtain the mixed solution of glutaric acid-polyvinyl alcohol composite ...

Embodiment 3

[0058] 1) Under the condition of stirring, weigh 50.0 g of polyvinyl alcohol (the degree of polymerization is 1700, the degree of alcoholysis is 96%) and slowly add it into 900 ml of deionized water at about 25°C. After fully stirring and dispersing for 15 minutes, gradually raise the temperature to Incubate at 95°C for 30 minutes, cool naturally after the polyvinyl alcohol is completely dissolved, then set the volume to 1000 ml, and prepare a polyvinyl alcohol aqueous solution with a mass concentration of 5.0%.

[0059] Weigh 5.0 g of malonic acid and 15 g of adipic acid in 100 mL of deionized water, dissolve them to obtain malonic acid-adipic acid aqueous solution.

[0060] Under the condition of stirring, add 100 ml of polyvinyl alcohol solution to the aqueous solution of malonic acid-adipic acid, after mixing thoroughly, set the volume to 1000 ml, adjust its pH value to 5.5, and obtain malonic acid-adipic acid- Mixed solution of polyvinyl alcohol composite soft template. ...

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Abstract

The invention discloses a green method for preparing silver nanowires with high aspect ratio by composite soft template method, which belongs to the technical field of preparation of noble metal nanomaterials. First mix the organic diacid aqueous solution, polyvinyl alcohol aqueous solution and deionized water, adjust the pH value of the mixed system to 2-6.5, and prepare the mixed solution of organic diacid-polyvinyl alcohol composite soft template; then mix the silver salt aqueous solution, The aqueous solution of gallic acid and the mixed solution of organic diacid-polyvinyl alcohol composite soft template are mixed evenly, and then reacted under low-speed stirring conditions to obtain a solid-phase reaction product, and then washed with an aqueous solution of ethanol to obtain a silver nanometer with a high aspect ratio. Wire. The silver nanowires with high aspect ratio prepared by the present invention not only have high purity and good uniformity, but also have simple preparation method, easy operation, high yield, low cost and environmental friendliness, etc., and the obtained silver nanowires with high aspect ratio Has good antibacterial activity.

Description

technical field [0001] The invention belongs to the technical field of preparation of noble metal nanometer materials. Background technique [0002] High-aspect-ratio silver nanowires are different from ordinary nano-silver particles. They combine the unique physical and chemical properties of noble metals with the structure of high-aspect-ratio silver nanowires. It is used in plasma imaging, transparent conductive film, solar cell, touch screen, electronic circuit, printed electronic technology and other fields, and has become a research hotspot in the material field. [0003] The preparation methods of silver nanowires with high aspect ratio disclosed in the existing literature mainly include liquid phase chemical reduction method, soft template method, photochemical method and electrochemical method. Soft templates are usually soft templates constructed of biological protein molecules, plant cells, polymers, etc., to control the synthesis of nanomaterials with a certain ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/06B22F1/05B82Y30/00B82Y40/00
CPCB22F9/24B82Y30/00B82Y40/00B22F1/0547B22F1/07
Inventor 沈明沈培培张金贵徐沈扬
Owner 江苏汇诚医疗科技有限公司
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