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Magnetic nano silver antibacterial material and preparation method thereof

A technology of magnetic nano and antibacterial materials, applied in botany equipment and methods, chemicals for biological control, sterilization/microdynamic water/sewage treatment, etc., can solve the difficulty of separating polymer microspheres or silica gel microspheres , restrictions, safety hazards of nano-silver particles and other issues, to achieve the effect of improving anti-oxidation and anti-dissolution ability, improving persistence, and good antibacterial advantages

Inactive Publication Date: 2010-03-10
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are hidden dangers in the use of surfactant-modified silver nanoparticles, and the polymer microspheres or silica gel microspheres embedded with nano-silver particles on the outer layer also have the problem of difficult separation after sterilization treatment, so they are not used in practical applications. subject to certain restrictions

Method used

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  • Magnetic nano silver antibacterial material and preparation method thereof
  • Magnetic nano silver antibacterial material and preparation method thereof
  • Magnetic nano silver antibacterial material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: the preparation method of magnetic nano-silver antibacterial material of the present invention

[0038] Fe provided by the present invention 3 o 4 -SiO 2 -Schematic diagram of the synthesis of Ag magnetic nano-silver antibacterial material figure 1 As shown, its specific preparation method can be divided into the following three steps:

[0039] First, Fe was prepared by hydrothermal oxidation 3 o 4 nanoparticles. First, 2.5g FeSO 4 ·7H 2 O was dissolved in 30 mL of deionized water; in a water bath at 30°C with vigorous stirring, 10 mL of 50 (g / L) polyethylene glycol-20000 (PEG-20000) and 30 mL of 28% ammonia were added dropwise to the above solution; Keep the pH around 10, then add 30% hydrogen peroxide (H 2 o 2 ) solution 0.27mL, after stirring for 20 minutes, put the above mixed solution into a stainless steel reaction kettle lined with polytetrafluoroethylene, seal it and place it in an oven at 180°C, take it out after heating for 5 hours, and...

Embodiment 2

[0042] Embodiment 2: prepare Fe of the present invention 3 o 4 -SiO 2 -Condition optimization of Ag magnetic nano antibacterial materials

[0043] In the preparation of magnetic nano-silver antibacterial materials, different doses of TEOS were selected for SiO 2 coating, different doses of AgNO 3 And lactose solution to prepare nano-silver, the mass percentage, magnetism and antibacterial ability of each part of the obtained antibacterial agent are different. Therefore, in this example, the dosage of TEOS and AgNO 3 The ratio of lactose concentration is optimized.

[0044] 1. Dose optimization of TEOS

[0045] to Fe 3 o 4 When particles are coated with silica gel, if the dose of TEOS is too small, the 3 o 4 If the silica gel layer coated on the surface of the particles is too thin, the nano-silver particles that can be loaded in the next step will be relatively small, which will affect its bactericidal effect; and if the dose of TEOS is too large, the formed silica g...

Embodiment 3

[0053] Embodiment 3: Structural characterization of magnetic nano-silver antibacterial material of the present invention

[0054] The present embodiment is the structural characterization of the third group of magnetic nano-silver antibacterial materials optimized in Example 2, specifically as follows:

[0055] 1. EDX spectrum

[0056] Adopt DX-4 type X-ray energy spectrometer (Philips company) to measure the element composition in the magnetic nano-silver antibacterial particle, the result is as follows figure 2 shown. The mass percentages of various elements are shown in Table 3;

[0057] Table 3Fe 3 o 4 -SiO 2 -Mass percentage of various elements in Ag magnetic nanoparticles

[0058]

Fe

O

Si

Ag

The mass of various elements

Ratio (%)

66.0

19.2

1.40

13.4

[0059] 2. XRD spectrum

[0060] The X-ray diffraction (XRD) spectrum of magnetic nano-silver antibacterial particles is obtained on...

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Abstract

The invention provides a magnetic nano silver antibacterial material for sterilization treatment in medical treatment and / or drinking water and a preparation method thereof. An antibacterial agent provided by the invention takes magnetic nanoparticles coated with silica gel as a core and inlaid with antibacterial particles on the outer layer, is preferably a Fe3O4 magnetic nano antibacterial material which is inlaid with silver nanoparticles and coated with silica gel. The antibacterial agent simultaneously has large special surface area of nano material, magnetic separation capacity and magnetic target of magnetic material, dispersant effect of a silica gel coating layer, protection action on the core and strong antibacterial ability of nano silver. In addition, the antibacterial agent issimple to prepare and convenient to operate and can realize directional sterilization, thereby having wide application prospect in medical care and food sanitation sterilization treatment.

Description

technical field [0001] The invention belongs to the disinfection and antibacterial field of medical care and food hygiene, and relates to a novel magnetic nano-silver antibacterial material used for sterilization treatment of medical treatment and / or drinking water. Background technique [0002] Silver (Ag), as the most commonly used inorganic antibacterial agent, has the advantages of high efficiency, safety, broad antibacterial spectrum, heat resistance, no drug resistance and high selectivity, and is widely used in antibacterial and antifungal products. The nano-silver inorganic antibacterial agent prepared by nanotechnology, due to the quantum effect, small size effect and large specific surface area, has an antibacterial effect that cannot be compared with conventional antibacterial agents. At the same time, it has high safety and long-lasting efficacy. Superior to traditional organic fungicides. However, due to the too small particle size of nano-silver particles (gen...

Claims

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Application Information

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IPC IPC(8): A01N59/16A01N25/00A01P1/00C02F1/50
Inventor 蔡亚岐张小乐
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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