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 par

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
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Example Embodiment

[0037] Example 1: Preparation method of magnetic nano silver antibacterial material of the present invention

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

[0039] First, prepare Fe by hydrothermal oxidation 3 O 4 Nano particles. First, 2.5g FeSO 4 ·7H 2 O was dissolved in 30mL deionized water; under 30℃ water bath and vigorous stirring, add 50 (g / L) polyethylene glycol-20000 (PEG-20000) 10mL and 28% ammonia water 30mL to the above solution dropwise; Keep the pH at around 10, then add 30% hydrogen peroxide (H 2 O 2 ) 0.27 mL of the solution. After stirring for 20 minutes, the above mixture was put into a stainless steel reactor lined with polytetrafluoroethylene, sealed and placed in an oven at 180°C, heated for 5 hours, and then taken out. After repeated washing with deionized water 3 times, it w...

Example Embodiment

[0042] Example 2: Preparation of Fe of the present invention 3 O 4 -SiO 2 -Optimization of conditions for Ag magnetic nano antibacterial materials

[0043] When preparing magnetic nano silver antibacterial materials, different doses of TEOS are selected for SiO 2 Coated, different doses of AgNO 3 As well as the preparation of nano-silver with lactose solution, the mass percentage, magnetic properties and antibacterial ability of each part of the obtained antibacterial agent are different. Therefore, in this example, the above-mentioned TEOS dose and AgNO 3 Optimize the ratio with lactose concentration.

[0044] 1. Dose optimization of TEOS

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

Example Embodiment

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

[0054] This example is the structural characterization of the third group of magnetic nano silver antibacterial materials optimized in Example 2, and the details are as follows:

[0055] 1. EDX spectrum

[0056] DX-4 X-ray energy spectrometer (Philips company) was used to determine the elemental composition in the magnetic nano silver antibacterial particles. The results are as follows figure 2 Shown. The mass percentages of various elements are shown in Table 3;

[0057] Table 3Fe 3 O 4 -SiO 2 -The mass percentage of various elements in Ag magnetic nanoparticles

[0058]

[0059] 2. XRD spectrum

[0060] The X-ray diffraction (XRD) pattern of the magnetic nano silver antibacterial particles was obtained on the b / max-RB Diffractometer (Rigaku, Japan), using nickel to filter CuKα rays, the scanning range is from 10° to 100°, and the scanning speed is 2° / min. ...

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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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