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Surface processing technology that dramatically improves the sterilization effect of metals is developed


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Surface processing technology that dramatically improves the sterilization effect of metals is developed

A research team at Purdue University in the United States succeeded in processing the surface of copper, which has been known to have a bactericidal effect since ancient times, to dramatically increase the bactericidal effect.

Hierarchical Micro / Mesoporous Copper Structure with Enhanced Antimicrobial Property via Laser Surface Texturing-Selvamani-2020-Advanced Materials Interfaces-Wiley Online Library
https://onlinelibrary.wiley.com/doi/abs/10.1002/admi.201901890

Now metal surfaces can be instant bacteria killers, thanks to new laser treatment technique-Purdue University News
https://www.purdue.edu/newsroom/releases/2020/Q2/now-metal-surfaces-can-be-instant-bacteria-killers,-thanks-to-new-laser-treatment-technique.html

HumanityPathogenic E. coliTo remove harmful bacteria likeAntibioticsWas developed. Antibiotics are said to be one of the greatest discoveries of the 20th century and are called "miracle drugs," but in recent years, antibiotics have not worked.Super bugBacteria that evolved into "" also appeared. The battle for the survival of humans and bacteria continues.

For these reasons, sterilization methods other than drugs such as antibiotics have recently attracted attention. The research presented by the research team at Purdue University is a technology for surface treatment that can enhance the bactericidal effect of copper. The research team has released a movie explaining the developed processing technology.

Treating Metal Surfaces to Kill Bacteria-YouTube

(embed) https://www.youtube.com/watch?v=3vFFdNXsoN0 (/ embed)

Traditionally, copper has been known to have a bactericidal effect, but it takes several hours for ordinary copper to completely kill bacteria.

A research team at Purdue University has developed a technology that enhances the germicidal effect of copper by irradiating the surface with a laser. The following is the state of actually irradiating the laser on the copper surface.

50 nanometersresolutionofScanning electron microscopeThe following is a comparative image of the unprocessed copper surface (left side) and the copper surface processed by the newly developed technology (right side). This technology increases the surface area by irradiating a laser to form irregularities at the nanometer level on the surface. As the surface area increases, the probability that bacteria will come into contact with copper will increase, and the bactericidal effect will increase.

The research team also confirmed that this surface treatment actually enhances the bactericidal effect of copper and copper alloys. Copper surface-treated by this technology is not only Pseudomonas aeruginosa and E. coli but also a kind of super bugMethicillin-resistant Staphylococcus aureusIt is said that the time it takes to completely kill the car has been greatly reduced.

In addition, the metal surface processed by this technology absorbs water.Super hydrophilicIt also has the property of "". The more hydrophilic the surface of implants used in orthopedic surgery, the stronger the adhesion of bone cells and the greater the degree of adhesion to bone. Therefore, this technique also holds promise for surface treatment of implants.

In addition, the research team claims that the technology also has the advantage of being "green." There is already a technology to improve antibacterial properties by coating a metal surface, but it has been pointed out that the coating peels off and leach out, which is harmful to the environment. There is no such concern because the new technology this time is only to change the shape of the surface.

In addition, copper is also used against the new coronavirusShow effectHowever, since viruses are much smaller than bacteria, processing the surface with this technology has no effect.

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