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Method for preparing nano-silver with different particle sizes by using surfactant

A surfactant and nano-silver technology, applied in the direction of nano-technology, can solve the problems of excessive particle size of nano-silver particles, harsh operating conditions, poor antibacterial performance, etc., and achieve widening of application fields, low cost, and practicality strong effect

Active Publication Date: 2021-08-20
广东省江门市质量计量监督检测所 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods often require the use of special equipment and solvents, and the operating conditions are harsh and difficult. At the same time, the particle size of the prepared silver nanoparticles is too large, and the antibacterial performance is not good.

Method used

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  • Method for preparing nano-silver with different particle sizes by using surfactant

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Experimental program
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Effect test

Embodiment 1

[0018] Prepare a silver nitrate solution with a concentration of 0.1g / L, slowly drop the surfactant solution into the silver nitrate solution within 30min to obtain a solution; dissolve sufficient tannic acid and surfactant in water to obtain b solution, b The concentration of surfactant in the solution is the same as that of solution a, slowly drop solution b into solution a within 60 minutes to prepare solution c; cool solution c to room temperature, adjust the pH value to 5.0 with 0.01mol / L hydrochloric acid, and complete Preparation of silver nanoparticles. Among them, the reaction temperature during the preparation of solution a and solution c is 20°C, the concentration of surfactant in solution a and solution b is 0.7mmol / L, the stirring speed is 300rpm, and the surfactant is 0.593mmol / L CMC and 7.9 HLB Nonionic surfactant.

Embodiment 2

[0020] Prepare a silver nitrate solution with a concentration of 2g / L, and slowly drop the surfactant solution into the silver nitrate solution within 60 minutes to obtain a solution; a sufficient amount of ascorbic acid and surfactant are dissolved in water to obtain a b solution. The concentration of the active agent is the same as that of solution a, slowly drop solution b into solution a within 150 minutes to obtain solution c; cool solution c to room temperature, adjust the pH value to 3.0 with 0.01mol / L hydrochloric acid, and complete the preparation of nano silver preparation. Among them, the reaction temperature during the preparation of solution a and solution c is 50°C, the concentration of surfactant in solution a and solution b is 1.0mmol / L, the stirring speed is 500rpm, and the surfactant is 0.593mmol / L CMC and 7.9 HLB Nonionic surfactant.

Embodiment 3

[0022] Prepare a silver nitrate solution with a concentration of 0.15g / L, and slowly drop the surfactant solution into the silver nitrate solution within 60 minutes to obtain a solution; a sufficient amount of sodium borohydride and surfactant are dissolved in water to obtain a b solution, b The concentration of surfactant in the solution is the same as that of solution a, slowly drop solution b into solution a within 90 minutes to obtain solution c; cool solution c to room temperature, adjust the pH value to 6.0 with 0.01mol / L hydrochloric acid, and complete Preparation of silver nanoparticles. Among them, the reaction temperature during the preparation of solution a and solution c is 40°C, the concentration of surfactant in solution a and solution b is 1.3mmol / L, the stirring speed is 600rpm, and the surfactant is 0.593mmol / L CMC and 7.9 HLB Nonionic surfactant.

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Abstract

The invention relates to a method for preparing nano-silver with different particle sizes by using a surfactant. The method is characterized by comprising the following three steps of: (1) slowly dripping a surfactant solution into a silver nitrate solution with a certain concentration within 30-60 min to prepare a solution a; (2) dissolving a sufficient amount of a reducing agent and a surfactant in water to obtain a solution b, a concentration of the surfactant in the solution b being the same as that of the surfactant in the solution a, slowly dripping the solution b into the solution a within 60-150 min to obtain a solution c, and (3) cooling the solution c to room temperature, and adjusting the pH value of the solution to 3.0-9.5 by using a pH regulator to complete the preparation of the nano-silver, wherein stirring is needed during dripping, and the temperature is 20-50 DEG C. According to the method, controllability of the particle sizes in the nano-silver preparation process can be achieved according to the type and use quantity of the surfactant, the particle size of the prepared nano-silver ranges from 20.6 nm to 129.5 nm, and the prepared nano-silver has good compatibility with anion, cation and nonionic materials. The method is simple in preparation process operation, mild in reaction condition, wide in raw material source and high in practicability.

Description

technical field [0001] The invention belongs to the technical field of preparation of nano-silver antibacterial agents, in particular to a method for obtaining nano-silver with different particle sizes by using different types and amounts of non-ionic surfactants in the preparation process of nano-silver. Background technique [0002] Due to their unique small size effect, quantum size effect, surface effect and macroscopic quantum tunneling effect, nanoparticles are endowed with many special properties superior to traditional antibacterial materials. Among them, the antibacterial performance of nano-silver is much higher than that of other metal nanoparticles. The general dosage is 10 -6 (24h) or ≤0.5μg / mL can be sterilized, and has a strong killing effect on 12 kinds of Gram-negative bacteria, 8 kinds of Gram-positive bacteria, and 6 kinds of molds. It is recognized as the strongest nano-antibacterial agent. Nano-silver particles can enter the pathogen and quickly combin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00
Inventor 张金伟温永汉区棋铭朱国军余国枢黄雨锟
Owner 广东省江门市质量计量监督检测所
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