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A kind of core-shell micron silver and its preparation method and application

A micro-silver, core-shell type technology, applied in the direction of botany equipment and methods, applications, metal processing equipment, etc., can solve the problems of large limitations and strong pertinence, and achieve mild conditions, simple operation, and broad-spectrum bactericidal performance Effect

Active Publication Date: 2019-07-23
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, CN 201310009307 discloses a surface-modified micro-silver sphere assembled by nanosheets and a preparation method thereof, which is prepared by electrochemical deposition, but this method is highly targeted and has large limitations

Method used

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  • A kind of core-shell micron silver and its preparation method and application
  • A kind of core-shell micron silver and its preparation method and application
  • A kind of core-shell micron silver and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve the rhamnolipid in pure water first, make a 1 g / L solution, adjust to pH 6-7, mix well; then add AgNO 3 Add it to the rhamnolipid solution, the final concentration is 1 g / L, and mix well. Place it in a water bath at 80°C for 2 h, and react while stirring. Sampling at 5 min, 10 min, 20 min, 40 min, 1 h, 2 h. The reaction solution was cooled to room temperature, centrifuged, and the precipitate was collected and dissolved in ultrapure water to obtain the product, see figure 2 .

[0027] It can be seen from the figure that with the increase of time, the maximum absorption peak remains unchanged at 451 nm, indicating that with the increase of time, the product is constantly accumulating, and time will not affect the size of nano-silver. After 2 h of reaction, the maximum absorption peak rises to OD 451 =17.06. Therefore, 2 h was selected as the optimal reaction time.

Embodiment 2

[0029] Dissolve the rhamnolipid in pure water first, make a 1 g / L solution, adjust to pH 6-7, mix well; then add AgNO 3 Add it to the rhamnolipid solution, the final concentration is 1 g / L, and mix well. Place them in water baths at 20°C, 37°C, 60°C, and 80°C for 2 h, and react while stirring. The reaction solution was cooled to room temperature, centrifuged, and the precipitate was collected and dissolved in ultrapure water to obtain the product, see image 3 . It can be seen from the figure that when the reaction temperature is 80°C, the maximum absorption peak of the reactant is the largest. It can be seen that as the temperature increases, the reaction rate is the largest and the yield is the highest. Therefore, the optimal reaction temperature of 80°C was selected.

Embodiment 3

[0031] Dissolve rhamnolipid in pure water first, make 1 g / L, 2 g / L, 4 g / L solutions, adjust to pH 6-7, mix well; then add AgNO 3 Add it to the rhamnolipid solution, the final concentration is 1 g / L, and mix well. Place it in a water bath at 80°C for 2 h, and react while stirring. The reaction solution was cooled to room temperature, centrifuged, and the precipitate was collected and dissolved in ultrapure water to obtain the product, see Figure 4 . It can be seen from the figure that the maximum absorption peaks of the products are different with the addition of different concentrations of rhamnolipids. When the added concentration of rhamnolipid was 1 g / L, the maximum absorption peak of the reactant was the largest. Therefore, the optimal reaction concentration of rhamnolipid was selected as 1 g / L.

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Abstract

The invention discloses a core-shell type micron silver and its preparation method and application. Firstly, rhamnolipid is dissolved in pure water to prepare a 0.01-5 g / L solution, adjusted to pH 6-7, and mixed evenly ; Then AgNO 3 Add to the rhamnolipid solution, the final concentration is 0.1-1 g / L, mix well. Place it in a water bath at 60°C-80°C for 1-10 h, and react while stirring. The step reaction solution was cooled to room temperature, centrifuged, and the precipitate was collected and dissolved in ultrapure water to obtain the product. The core-shell micron silver has broad-spectrum bactericidal properties, and has bactericidal effects on Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus at a concentration of 10 mg / L.

Description

technical field [0001] The invention relates to a method for synthesizing core-shell micron silver by using biosurfactant rhamnolipid, belonging to the field of micron materials. Background technique [0002] The average particle size of micron silver is elemental silver around 10 μm. Compared with nano-silver, micro-silver does not penetrate into the skin or mucous membranes, but stays on the surface of the skin, killing harmful bacteria and microorganisms that come into contact with the skin, making it an ideal antibacterial additive in cosmetic applications. Micron Silver is an antimicrobial raw material for personal care, medical, pharmaceutical and animal health products. It can be used wherever germs are present on surfaces or where protection from microbes is required. At present, there are many methods for preparing micron silver, but there is no fast, efficient and simple method for synthesizing micron silver. For example, Bio-Gate produces micron silver by a pur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/02A01N59/16A01P1/00
CPCA01N59/16B22F9/24B22F1/102
Inventor 方艳徐帆莉姜岷刘婧媛张尚杰刘世勋薛瑞
Owner NANJING TECH UNIV
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