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Nuclear shell structure intelligent disinfectant containing silver

A technology of fungicide and shell structure, which is applied in the field of core-shell structure silver-containing nanocomposite smart fungicides, can solve the problems of fungicide loss of function, no slow-release effect, long aging time, etc., to achieve inhibition of bacterial growth, effective The effect of modulating the bactericidal efficiency

Inactive Publication Date: 2010-09-01
南京奥特高科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The release of the fungicide in the aforementioned technology cannot be controlled, and the fungicide may lose its effect quickly due to changes in external conditions, so it is difficult to maintain a long-term and stable bactericidal effect
In addition, silver nanoparticles have disadvantages such as easy oxidation, long aging time, poor dispersion, and no slow-release effect.

Method used

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  • Nuclear shell structure intelligent disinfectant containing silver
  • Nuclear shell structure intelligent disinfectant containing silver
  • Nuclear shell structure intelligent disinfectant containing silver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 0.735g of silver nitrate solution in 400mL of water, perform liquid-phase reduction with trisodium citrate for 60min in a 100°C water bath to prepare silver glue; add 25mL of the above-mentioned yellow-green silver sol into 100mL of absolute ethanol, and dropwise add ammonia water to adjust the pH is 10; then add 11.25mL (10mM) tetraethyl orthosilicate ethanol solution to the mixed solution, and continue to stir for 18h to obtain a two-layer structure containing silver nanocomposite structure intelligent bactericide; the obtained product is centrifuged under the condition of 5000rpm. is Ag@SiO 2 . The silver core is 30 nanometers in diameter and the silicon dioxide is 35 nanometers thick. 4 μg / mL of the bactericide was used in the bactericidal experiment of Escherichia coli, and the bactericidal effect was observed after 15 minutes, and the mortality rate of Escherichia coli was 93%.

Embodiment 2

[0033] Dissolve 0.9 g of silver nitrate solution in 400 mL of water, and perform liquid-phase reduction with trisodium citrate for 60 min in a water bath at 100 °C to prepare silver glue; add 25 mL of the above yellow-green silver sol into 100 mL of absolute ethanol, and add ammonia water dropwise to adjust the pH Then add 45mL (10mM) tetraethyl orthosilicate ethanol solution to the mixed solution, and continue to stir for 18h to obtain a two-layer structure containing silver nanocomposite structure intelligent bactericide; the obtained product is centrifuged at 5000rpm. The product is for Ag@SiO 2 . The diameter of the silver core is 45 nanometers, and the diameter of the silicon dioxide is 85 nanometers. 4 μg / L of the bactericide was used in the bactericidal experiment of Escherichia coli, and the bactericidal effect was observed after 15 minutes, and the mortality rate of Escherichia coli was 95%.

Embodiment 3

[0035] Take 30mg of silver nitrate, 10mg of Stober method to synthesize 30nm silicon dioxide, dissolve it in 15mL of 0.01% trisodium citrate solution, and irradiate it under a UV lamp of 254nm for 8h to prepare silver-loaded silicon dioxide to obtain a silver layer with a thickness of 20 nanometers. SiO 2 @Ag; Add the above-mentioned centrifugally purified silver-loaded silica into absolute ethanol, drop ammonia water to adjust the pH to 10, then add 10mM (5ml) tetraethyl orthosilicate ethanol solution to the mixed solution, continue Stir for 18h, centrifuge the obtained product under the condition of 5000rpm to obtain the outer layer of silica, which is 5 nanometers of tri-core shell SiO 2 @Ag@SiO 2 . 4 μg / L of the bactericide was used in the bactericidal experiment of Escherichia coli, and the bactericidal effect was observed after 15 minutes, and the mortality rate of Escherichia coli was 99.5%.

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Abstract

The invention discloses nuclear shell structure intelligent disinfectant containing silver. The disinfectant is characterized in that nanometer Ag is taken as a core, and AgSiO2 particles of a nanometer SiO2 layer are attached to the core; or nanometer SiO2 is taken as a core; and SiO2 (AgSiO2) n particles of at least one layer of Ag-SiO2 layers are attached to of the core; or a SiO2 layer attached to nanometer Ag particles is taken as a core; and AgSiO2 (AgSiO2) m particles are attached to at least one layer of Ag-SiO2 layers, wherein ammonia is absorbed in a SiO2 aperture of the nanometer SiO2 layer. Silver is the main body of the disinfectant, silicon dioxide provides medium for controlling the releasing speed of the silver, and the thickness of the silicon dioxide determines the releasing speed of the silver disinfectant. Moreover, the releasing speed of a multi nuclear shell system changes along with the change of the environment. When the humidity of the environment is high, the releasing speed is faster. The growth of bacteria is effectively restricted, and the characteristic of intelligent disinfection is performed.

Description

technical field [0001] The invention belongs to the field of antibacterial materials, and in particular relates to a core-shell structure silver-containing nanocomposite intelligent bactericide, which can control the slow-release speed of the bactericide through the composition of the core-shell structure. Background technique [0002] As early as ancient times, people discovered that silver has natural antibacterial properties and safety. In 1893, Swiss botanist Mech discovered that silver ions could kill algae. In 1929, the British Flime used silver-loaded drugs to treat syphilis. In the future, with the development of human beings and the advancement of science and technology, silver will be used as a safe broad-spectrum bactericidal material. In recent years, with the rapid development of nanomaterials and nanotechnology, nanomaterials show different optical properties, thermodynamic properties, dielectric properties, and mechanical properties from bulk materials due t...

Claims

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Application Information

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IPC IPC(8): A01N25/34A01N25/22A01N25/08A01N59/00A01P1/00
CPCA01N59/16A01N25/26A01N25/28A01N25/34
Inventor 李雪梅何涛贾丽凤李志鹏周迎春
Owner 南京奥特高科技有限公司
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