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Preparation method for bionic nano-silver

A bionic nano, silver nitrate technology, applied in the nano field, can solve problems such as complex preparation process

Active Publication Date: 2014-07-02
INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process is complex

Method used

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  • Preparation method for bionic nano-silver
  • Preparation method for bionic nano-silver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) at room temperature, silver nitrate is dissolved in water to make a silver nitrate aqueous solution with a mass volume ratio of 0.1%;

[0034] 2) At room temperature, dissolve glacial acetic acid in water to make a 0.05 M acetic acid aqueous solution;

[0035] 3) Collagen is dissolved in 0.05 M acetic acid aqueous solution to make a collagen aqueous solution with a mass volume ratio of 0.5%;

[0036] 4) Stir the collagen acetic acid aqueous solution, add 0.1% silver nitrate aqueous solution dropwise at a rate of 2mL / min until the volume ratio of collagen acetic acid aqueous solution to 0.1% silver nitrate aqueous solution is 1:1, and continue stirring for 20min , so that collagen molecules and silver ions are fully mixed, stop stirring, and react under sunlight for 4 hours to obtain a nano-silver product with a core / shell structure. Transmission electron microscope observation showed that ( figure 1 ), the nanosilver product has a core / shell structure.

[0037]

Embodiment 2

[0039] 1) at room temperature, silver nitrate is dissolved in water to make a silver nitrate aqueous solution with a mass volume ratio of 0.01%;

[0040] 2) Dissolve heparin sodium in water to make 2 mL of heparin sodium aqueous solution with a mass volume ratio of 5%;

[0041] 3) Stir the heparin sodium aqueous solution in the dark, add 200mL of 0.01% silver nitrate aqueous solution dropwise to it at a rate of 2mL / min, so that the volume ratio of the silver nitrate aqueous solution to the heparin sodium aqueous solution is 100:1, and continue stirring for 20min to make the heparin molecules Mix well with silver ions and stop stirring.

[0042] 4) Take 1mL of the mixed solution and place it in an adaptive cuvette, and irradiate the liquid surface with blue visible light with a wavelength of 465-495nm (illuminance 1523 lux) for 3 minutes, the solution turns from colorless to red, and transmission electron microscope observation shows that the nano The silver product has a sphe...

Embodiment 3

[0045] 1) at room temperature, silver nitrate is dissolved in water to make a silver nitrate aqueous solution with a mass volume ratio of 5%;

[0046] 2) At room temperature, dissolve glacial acetic acid in water to make a 0.05 M acetic acid aqueous solution;

[0047] 3) Chitosan (M w =10 5 , degree of deacetylation=87%) was dissolved in 0.05 M acetic acid aqueous solution to make chitosan acetic acid aqueous solution 1000mL with a mass volume ratio of 0.01%;

[0048] 4) Stir the chitosan acetic acid aqueous solution at a high speed with an IKA T18 disperser, add 200 microliters of 5% silver nitrate aqueous solution dropwise therein, so that the volume ratio of the silver nitrate aqueous solution to the chitosan acetic acid aqueous solution is 1:5000, and continue high-speed stirring 1min, the chitosan molecule and the silver ion were fully mixed, the stirring was stopped, and the reaction was left to stand under sunlight for 6 hours, the solution changed from light yellow t...

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Abstract

The invention relates to a preparation method for bionic nano-silver. Silver nitrate and natural polymer or derivative of the natural polymer are raw materials and react in a water solution under stimulation of sunlight or visible light. The natural polymer is protective agents, reducing agents and photosensitizer and generates the nano-silver under stimulation of sunlight or low-frequency visible light at the room temperature. The prepared nano-silver has high safety under the protection of the natural polymer, can be applied to biomedical materials or daily chemical products, gives play to an antibacterial function, and can obviously reinforce the Raman signals of molecules to be detected when used as Raman base materials. The preparation method for the bionic nano-silver is simple, reliable, capable of meeting the requirements for the shape and performance of the nano-silver in the field of biomedicine or spectrums, good in biosecurity, capable of controlling the shape and the particle size of products, and wide in application range.

Description

technical field [0001] The invention belongs to the field of nanotechnology, and in particular relates to a preparation method of bionic nano-silver. Background technique [0002] Nano-silver is the most representative emerging functional material among metal nanoparticles. It can be used not only as a material for microelectronics, optics, and catalysis, but also in cutting-edge fields such as DNA detection and cell imaging. Great template for nanoparticles. [0003] The preparation of nano-silver by biological methods has the advantages of uniform particle size and no environmental pollution, but there are problems such as low yield, high cost, and difficulty in separating from organisms. Simulating the biological reduction process in vitro, using the combined action of biomolecules and sunlight or visible light to realize the reduction of silver ions and the preparation of nano-silver, can solve the problems faced by biological methods for preparing nano-silver. The me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 张其清关嫚段瑞平周志敏陈汉李学敏刘玲蓉
Owner INST OF BIOMEDICAL ENG CHINESE ACAD OF MEDICAL SCI
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