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New laser etching technology will make common metal become idiosyncratic material
- Jan 22, 2016 -

New laser etching technology will make common metal become idiosyncratic material

Washington, January 20, 2015 - University of Rochester in New York researchers bombarded by femtosecond laser pulses ordinary metals developed an extraordinary new surface material, which can effectively absorb solar energy, water purification and self . This versatile material is used to make high durability, low maintenance solar collectors and solar sensor.

"This is the first using a laser to create a versatile metal surface material, the material having a superhydrophobic (water), self-purification and high absorption multiple functions," Guo Chunlei said that he is a physicist of the University of Rochester School of light. Guo and his colleagues with the University of Rochester researchers AnatoliyVorobyev jointly developed the new material. The researchers used a detailed laser etching process to produce the material published in the American Institute of Physics' Journal of Applied Physics ".
Light absorbing material to enhance the ability of those who would benefit from science and technology need to collect solar energy, such as solar energy sensors and solar devices, and superhydrophobic surface rust will make the material, anti-icing and anti-biofouling, all these features will increase the durability of the device, making it easier to maintain, Guo said. Superhydrophobic surface of the material is also beneficial to self-purification, because they can not penetrate the surface of the water droplets can effectively take away the dust particles.

Researchers with a duration of the order of 1/ 1,000,000,000,000,000 ultrashort femtosecond pulses bombardment of platinum, titanium, copper, and three samples, so as to obtain the new surface material. "In the short bombardment, the peak energy of the laser pulse energy is equivalent to the sum of the entire North American power grid," Guo said. These super pulsed laser etched metal surfaces in a large number of fine lines, densely distributed on these lines and rugged nanostructures thus formed. Microstructure fundamentally change the optical properties and wetting properties of the surface of the three metals will usually reflective metal surface transformed into a high light absorbing surface, and make them waterproof quality. Professor, University of Rochester School of light Guo Chunlei developed a material with a laser so that hydrophobic technology, as shown by the drops of water falling from the treated sample surface technology.

Most commercial uses and hydrophobic material having a high optical absorption depending on the chemical coating, these coatings will degrade over time or off, Guo said. But for this new material, the laser-etched nano-micron structures have become intrinsic properties of the metal surface, it will not change over time.

The new hydrophobic materials can be used with the well-known non-stick coating comparable. "Many people know teflon (non-stick coating) is a material having a hydrophobic surface, but if you want to make water drops fall from the non-stick coating, you have to make the surface tilt angle of nearly 70 degrees . "Guo said. "And this we have developed a surface material has a stronger hydrophobicity, just tilted a few degrees, drops of water can fall."

Guo and his colleagues have for many years with a laser transition material nature experience. A few years ago, they used a laser developed a super-hydrophilic material, on its surface, and even drops of water against gravity upward slope of the stream. "After that, we wanted to manufacture a kind of contrast technique in which the surface of the waterproof material."

Study group next plans to develop more features in other superconducting material and a dielectric material. These versatile characteristics should be more widely used, such as to produce better solar collectors.