Maxphotonics co.,ltd

High quality product, professional service, being the core supplier in laser industry!

Home > News > Content
Femtosecond Laser: Application in Industrial "Corrosion"
- Mar 12, 2016 -

Femtosecond Laser: Application in Industrial "Corrosion"

Corrosion of the metal oxide is a headache once things. How to make the metal is not in the years lose their luster? Femtosecond laser technology from the optical means to start, not only for the metal from corrosion, but also turning it into a magical super-hydrophobic material.

Water is the source of life, even if it can only be regarded in some damp places, bacteria and other microorganisms are able to survive or grow; basic conditions while water is also needed for many chemical reactions, such as due to the presence of water, the metal will not be perceived speed oxidation.

However, in many places, people do not want a metal oxide or breeding colonies - such as an outdoor antenna, aircraft wings, cooking pot .People expect some hydrophobic, super-hydrophobic materials used in these places.

In fact, super-hydrophobic materials around us everywhere: "lightness finds, Qing Lian without demon," the lotus, the leaves is a typical super-hydrophobic material, there are super-hydrophobic material on the foot of many insects, such as the famous water strider, which is relying on "no water on the legs," walk on water like a champ.
In the family of hydrophobic materials, rare metal figure. However, the American College of University of Rochester optical physicist Guo Chunlei (transliteration) and colleagues found that the latest research, the use of a technique called femtosecond laser, they can also put metal into a hydrophobic than the lotus "very hydrophobic materials . " Strong hydrophobic effect of that water drops on metal surface not only will not spread, or even continue to bounce. This sounds incredible study published in the American Institute of Physics January 20 issue of "Journal of Applied Physics." Guo Chunlei team used ultra-high energy and ultra-short laser pulses to change the surface of the metal, the duration of femtoseconds (ie femtosecond) order of magnitude. They ultrashort femtosecond pulses bombardment of platinum, titanium, copper, three kinds of samples obtained above novel surface material. The advantage of this process is that "the nature of the laser structure is created on the metal surface of the upper portion of the material." Guo Chunlei said in a recent news report, which means they will not be erased, and it is these structures so that the metal with super hydrophobic properties.

According to the researchers, super pulse laser etched on the metal surface a lot less than the naked eye, such as pits, small beads and fine lines and other "marks", which marks the formation of a dense and rugged nanostructures. Such nanostructures change the optical properties and wetting properties of the metal surface fundamentally.

Teflon is a conventional hydrophobic material, often as a "non-stick" coating of choice. But femtosecond laser treated metal material than Teflon smooth. Teflon coating from the surface of the water droplets rolled down, need water droplets rolled before this surface is inclined to 70 degrees, by the femtosecond laser bombarded metal, only less than 5 degrees inclination do not even have the inclination, water droplets can from rolling surface.

In addition, water droplets rebound from superhydrophobic surfaces simultaneously, collect and take away dust particles. For self-cleaning properties of the test material, Guo Chunlei team removed from the vacuum cleaner in the ordinary dust sprinkled on the surface of the treated material, only three drops of water will be about half of the dust cleared, the surface has only a dozen spotless drip, and the surface remains dry.

Far-reaching and extensive application prospects
Corrosion of the metal oxide is a headache once things. Let the metal from corrosion, is not tarnished years, mankind has been pursuing the goal. From paint, alloy nano coating, people are constantly updated with the metal hydrophobic means. Today, femtosecond laser technology from the optical point of start, not only for the metal from corrosion, but also will become the magic super hydrophobic material. The method is simple, effective, future production is expected to subvert the process of hydrophobic material.

Guo Chunlei that such superhydrophobic materials have great potential in developing countries. "In these areas, is essential to collect rainwater, use of superhydrophobic materials can improve efficiency, but also no longer need to use a large funnel having sharp corners to prevent water retention on the surface." Guo Chunlei said, "Another application is manufacturing use more clean and healthy toilets."

In dry areas, to keep the toilet clean is a challenge to the use of superhydrophobic materials without using water to flush toilets kept clean.

According to foreign media reports, the potential aroused the Bill and Melinda? Gates Foundation's interest, they have begun to support this work.

There are reports of femtosecond laser can be used in polymer processing, medical imaging and surgical medical. Laser vision correction (LASIK) femtosecond laser can create the corneal flap. Femtosecond laser correction of myopia surgery is now the most advanced eye surgery in this century. In addition, the femtosecond laser technology can also be used in solid state physics, in order to analyze the crystal structure, whose diffraction analysis or fluorescence spectra. On the basis of field research, the femtosecond laser can be used to study ultrafast phenomena.

Since the super-hydrophobic materials can greatly reduce the vehicle in the water and even the air resistance movement, the study of designing high-speed water, underwater and air transport also has an important reference value.

Yet captured the high technology

As same with many laboratories and prestigious achievement, there are still many challenges before the potential applications of "super-hydrophobic surface metal" into reality. Guo Chunlei that the current process one square inch (about 6.45 cm2, an area equivalent to the size of an ordinary playing cards) metal model takes 1 hour. Before you apply to developing countries, this process requires large-scale production. Researchers are also looking to use this technology on other non-metallic materials method.

In addition, Guo Chunlei team now plans to concentrate on improving the speed of the surface with laser etching, also studied how this technology will be extended to other materials, such as semiconductor or dielectric.

Guo Chunlei emphasized, with a technology can be used to produce multi-purpose metal material. Metals are excellent reflector of light, which is the reason they have a glossy, and darken the metal can make them efficient light absorption. The end of 2006, Guo Chunlei and his research team have used a laser beam processing aluminum, the metal surface to create able to absorb almost all light nanostructures, allowing ordinary aluminum block into one so far created the darkest material .

And the light absorption characteristics can be combined with the hydrophobic phase does not rust and does not require much cleanup more efficient solar collectors. In addition, potential applications include more advanced stealth technology.

Further reading: The Magic of femtosecond laser technology

Femtosecond laser pulse width refers to the time domain in the femtosecond (10-15 seconds worth a thousand parts per trillion 1 second) the order of the laser. It is understood that the femtosecond laser is not monochromatic, but the combinations of light around the center wavelength of the wavelength period of continuous change, the use of space within this range continuous wavelength coherent light to be greatly compressed in time, in order to achieve fly order of seconds pulse output.

If 1 femtosecond equal one second, then the original 1 seconds about 32 years. Because of this femtosecond laser pulses of very short duration, peak power output of femtosecond pulses can be achieved with the power grid throughout North America a considerable level. Fortunately, although the intensity of the laser generated incredible, but only a femtosecond laser with an ordinary electrical outlet on the wall will be able to drive - short pulse mode-locked lasers typically use technology to achieve, which means that once this process through improved , the operation is relatively easy.

Femtosecond laser is currently under laboratory conditions mankind can obtain the shortest pulse techniques, and has been applied. Scientists predict that the femtosecond laser will play an important role in the next century and new energy generation.