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Mono-disperse nano-silver particle coated with succinylated chitosan and preparation method of particle

A technology of succinylated chitosan and nano-silver particles, which is applied in the field of precious metal materials, can solve the problems of harsh production conditions of nano-silver, limit the use range of nano-silver, and poor solubility, and achieve large specific surface area, small particle size, Good effect of monodispersity

Pending Publication Date: 2021-02-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor solubility of chitosan in neutral and alkaline solutions makes the production conditions of nano-silver extremely harsh, further limiting the scope of use of nano-silver

Method used

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  • Mono-disperse nano-silver particle coated with succinylated chitosan and preparation method of particle
  • Mono-disperse nano-silver particle coated with succinylated chitosan and preparation method of particle
  • Mono-disperse nano-silver particle coated with succinylated chitosan and preparation method of particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of preparation method of monodisperse nano-silver particles coated with succinylated chitosan, the steps are as follows:

[0032] (1) Add 6g chitosan (DD=82%) into a 250mL flask, then add succinic anhydride / dehydrated ethanol solution (9g succinic anhydride dissolved in 180mL dehydrated ethanol), stir and react at 60°C for 12h , the molar ratio of succinic anhydride and chitosan is 2.5:1; the obtained product is dried at 45° C. to obtain succinylated chitosan after centrifugal washing;

[0033] (2) The above-mentioned succinylated chitosan is configured as a solution, and then 20mL of succinylated chitosan solution and 10mL concentration of 6mmol / L silver ammonia solution are mixed uniformly, and the succinylated chitosan Solute AgNO with silver ammonia solution 3 The mass ratio is 0.05:1; then dropwise add 10mL of glucuronic acid solution as a reducing agent, the concentration of the reducing agent is 1mg / ml, the reaction is completed after stirring at 60°C for...

Embodiment 2

[0035] A kind of preparation method of monodisperse nano-silver particles coated with succinylated chitosan, the steps are as follows:

[0036] (1) Add 6g chitosan (DD=82%) into a 250mL flask, then add succinic anhydride / dehydrated ethanol solution (9g succinic anhydride dissolved in 180mL dehydrated ethanol), stir and react at 60°C for 12h , the molar ratio of succinic anhydride and chitosan is 1.5:1, and the obtained product is dried at 45° C. to obtain succinylated chitosan after centrifugal washing;

[0037] (2) The above-mentioned succinylated chitosan is configured as a solution, and then 20mL of succinylated chitosan solution and 10mL concentration of 12mmol / L silver ammonia solution are mixed uniformly, and the succinylated chitosan with silver ammonia solution solute AgNO 3 The mass ratio is 0.2:1; then dropwise add 10mL of glucuronic acid solution as a reducing agent, the concentration of the reducing agent is 2mg / ml, after stirring and reacting at 90°C for 15min, t...

Embodiment 3

[0039] A kind of preparation method of monodisperse nano-silver particles coated with succinylated chitosan, the steps are as follows:

[0040](1) Add 6g chitosan (DD=82%) into a 250mL flask, then add succinic anhydride / dehydrated ethanol solution (9g succinic anhydride dissolved in 180mL dehydrated ethanol), stir and react at 60°C for 12h , the mol ratio of succinic anhydride and chitosan is 2:1, and the product obtained is dried at 45° C. to obtain succinylated chitosan after centrifugal washing;

[0041] (2) The above-mentioned succinylated chitosan is configured as a solution, and then 20mL of succinylated chitosan solution and 10mL concentration of 9mmol / L silver ammonia solution are mixed uniformly, and the succinylated chitosan with AgNO 3 The mass ratio is 0.1:1. Subsequently, 10 mL of glucuronic acid solution was added dropwise as a reducing agent, the concentration of the reducing agent was 1.5 mg / ml, after stirring and reacting at 70° C. for 30 minutes, centrifuge...

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Abstract

The invention discloses a mono-disperse nano-silver particle coated with succinylated chitosan and a preparation method of the particle. The method comprises the following steps that a succinylated chitosan solution and a silver-ammonia solution with the concentration of 6-12 mmol / l are mixed uniformly, then a glucuronic acid solution is dripped drop by drop to serve as a reducing agent, the mixture is stirred and reacts for 15-30 minutes at the temperature of 60-90 DEG C, after the reaction is completed, a product is washed centrifugally, and thus the product is the mono-disperse nano-silverparticle coated with the succinylated chitosan. According to the particle, with the help of the coordination effect of specific amino, carboxyl and silver ions of the succinylated chitosan, the succinylated chitosan is used as a protective agent, and silver nitrate is reduced by using the reducing agent to obtain the mono-disperse nano-silver particle coated with the succinylated chitosan. The mono-disperse nano-silver particle coated with the succinylated chitosan is small in particle size, large in specific surface area and good in mono-dispersity, and has a wide application prospect in thefield of printed electronics.

Description

technical field [0001] The invention relates to the field of precious metal materials, in particular to monodisperse nano-silver particles coated with succinylated chitosan and a preparation method thereof. Background technique [0002] Nanomaterials refer to a class of materials with at least one dimension in the range of 1-100nm or with it as the basic unit. Metal nanomaterials combine the unique physical and chemical properties of metals and the special properties of nanostructures, and are favored by researchers. Among them, nano-silver particles have good electrical conductivity, thermal conductivity, oxidation resistance and high surface energy, surface activity and catalytic performance, making them widely used in antibacterial packaging materials, catalysts, conductive pastes, conductive inks and other fields. . [0003] At present, the preparation methods of silver nanoparticles can be roughly divided into physical methods, chemical methods, and biological methods...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02B82Y40/00
CPCB22F9/24B82Y40/00B22F1/102
Inventor 陈广学严林娟张乾坤万小芳何明辉田君飞陈奇峰
Owner SOUTH CHINA UNIV OF TECH
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