Magnesium alloy modified by in-situ magnesium hydroxide nano-sheet and preparation and application thereof

A magnesium hydroxide and nanosheet technology, applied in nanotechnology, nanomedicine, nanotechnology, etc., can solve the problem of bacterial inactivation and other problems, and achieve the effect of improving biocompatibility, improving antibacterial, and reducing corrosion rate

Active Publication Date: 2019-12-20
CHINA MOREFOUND TECH LTD SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The contact between the nanosheet and the bacteria will exert a tangential force on the surface of the bacteria, thereby tearing the bacterial membrane and causing mechanical pressure to inactivate the bacteria.

Method used

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  • Magnesium alloy modified by in-situ magnesium hydroxide nano-sheet and preparation and application thereof
  • Magnesium alloy modified by in-situ magnesium hydroxide nano-sheet and preparation and application thereof
  • Magnesium alloy modified by in-situ magnesium hydroxide nano-sheet and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Polish and polish the magnesium sheets whose length, width and height are 10mm, 10mm and 5mm respectively, and clean them with alcohol. Put the sample into a 25mL reaction kettle, add 10mL of sodium hydroxide aqueous solution with pH = 12, tighten the reaction kettle and put it into the muffle furnace, the heating rate is 10°C min -1 , the reaction temperature was 120°C, and the reaction time was 4h, 8h and 12h. After the reaction, the microscopic morphology of the surface of each sample was observed by scanning electron microscope. Depend on figure 1 It can be seen that after 12 hours of hydrothermal reaction, a layer with an area of ​​1 μm is formed on the surface of the magnesium alloy. 2 , Magnesium hydroxide micro-nano sheets with a thickness of 5nm.

Embodiment 2

[0062] Crystallographic and chemical element analysis were performed on the surface of the sample treated in Example 1. High resolution TEM ( figure 2 ) results show that HT12 exists in the magnesium hydroxide crystal form of (101) crystal plane. XRD results ( image 3 ) can see the main peak of magnesium hydroxide. The XPS results showed that the conversion of Mg-Mg bonds to Mg-OH bonds would occur with the prolongation of treatment time ( Figure 4 ). The above results indicated that the hydrothermal reaction for 12 hours could obtain a layer of dense magnesium hydroxide nanosheets grown in situ.

Embodiment 3

[0064] The anticorrosion properties of the samples were analyzed by immersion method and electrochemical analysis method. There are many cracks on the surface of the untreated magnesium block after immersion, but no structural change occurs on the surface of the magnesium alloy modified by the magnesium hydroxide sheet ( Figure 5 ). The results of weight loss analysis showed that the weight loss of the magnesium alloy modified with nanosheets was significantly reduced compared with the bulk magnesium. Polarization curves show that the corrosion current decreases gradually with the prolongation of hydrothermal reaction time ( Image 6 ). Impedance spectroscopy showed that the longer the hydrothermal reaction time, the greater the impedance ( Figure 7 ).

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Abstract

The invention relates to a magnesium alloy material, in particular to a magnesium alloy modified by an in-situ magnesium hydroxide nano-sheet and a preparation and an application thereof. The materialis prepared by the magnesium alloy through a hydrothermal reaction under an alkaline condition. The protective effect of the in-situ formed magnesium hydroxide nano-sheet structure makes the corrosion resistance of the magnesium alloy be significantly enhanced; at the same time, the biocompatibility is significantly improved because the release rate of magnesium ions can be significantly reduced.In addition, a two-dimensional nanolayer structure has non-releasing physical antibacterial property depending on the contact. Therefore, the magnesium alloy material has extremely high application prospect in the field of medical implant.

Description

technical field [0001] The invention relates to a surface-modified magnesium alloy, in particular to an in-situ magnesium hydroxide nanosheet-modified magnesium alloy and its preparation and application. Background technique [0002] Magnesium alloy is one of the green engineering materials in the 21st century, and has broad application prospects in aerospace, transportation, 3C products, biomedicine, national defense, marine engineering and other fields. Since 2013, many related research papers have been published in top journals such as "Nature", "Science", "Nature Materials", "Nature Medicine", "Nature Communications". The development and processing of new magnesium alloys is one of the frontier hotspots in metal materials research. Magnesium and magnesium alloys have attracted the attention of the medical community due to their biodegradability and absorbability, and are intended to be used as degradable implant materials. However, magnesium metal degrades too quickly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/60A61L31/02A61L31/08A61L31/16
CPCC23C22/60A61L31/022A61L31/088A61L31/16A61L2300/102A61L2300/404A61L2300/606A61L2420/02C22C23/00A61L2400/12A61L27/047A61L27/306A61L27/54A61L2400/18A61L27/50B82Y5/00
Inventor 王国敏王怀雨朱剑豪
Owner CHINA MOREFOUND TECH LTD SHENZHEN
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