Super-hydrophobic properties could lead to applications in solar panels, sanitation and as rust-free metals
Scientists at the University of Rochester have used lasers to transform metals into extremely water repellent, or super-hydrophobic, materials without the need for temporary coatings.
Super-hydrophobic materials are desirable for a number of applications such as rust prevention, anti-icing, or even in sanitation uses. However, as Rochester’s Chunlei Guo explains, most current hydrophobic materials rely on chemical coatings.
In a paper published today in the Journal of Applied Physics, Guo and his colleague at the University’s Institute of Optics, Anatoliy Vorobyev, describe a powerful and precise laser-patterning technique that creates an intricate pattern of micro- and nanoscale structures to give the metals their new properties. This work builds on earlier research by the team in which they used a similar laser-patterning technique that turned metals black. Guo states that using this technique they can create multifunctional surfaces that are not only super-hydrophobic but also highly-absorbent optically.
Guo adds that one of the big advantages of his team’s process is that “the structures created by our laser on the metals are intrinsically part of the material surface.” That means they won’t rub off. And it is these patterns that make the metals repel water.
“The material is so strongly water-repellent, the water actually gets bounced off. Then it lands on the surface again, gets bounced off again, and then it will just roll off from the surface,” said Guo, professor of optics in the University’s Hajim School of Engineering and Applied Sciences. That whole process takes less than a second.
The materials Guo has created are much more slippery than Teflon—a common hydrophobic material that often coats nonstick frying pans. Unlike Guo’s laser-treated metals, the Teflon kitchen tools are not super-hydrophobic. The difference is that to make water to roll-off a Teflon coated material, you need to tilt the surface to nearly a 70-degree angle before the water begins to slide off. You can make water roll off Guo’s metals by tilting them less than five degrees.
As the water bounces off the super-hydrophobic surfaces, it also collects dust particles and takes them along for the ride. To test this self-cleaning property, Guo and his team took ordinary dust from a vacuum cleaner and dumped it onto the treated surface. Roughly half of the dust particles were removed with just three drops of water. It took only a dozen drops to leave the surface spotless. Better yet, it remains completely dry.
Guo is excited by potential applications of super-hydrophobic materials in developing countries. It is this potential that has piqued the interest of the Bill and Melinda Gates Foundation, which has supported the work.
The Latest on: Super-hydrophobic materials
[google_news title=”” keyword=”Super-hydrophobic materials” num_posts=”10″ blurb_length=”0″ show_thumb=”left”]
via Google News
The Latest on: Super-hydrophobic materials
- Researchers invented a super-waterproof material using new nanotechon November 5, 2023 at 3:07 am
Researchers working with nanotech have created what may be a super-waterproof material that causes the liquid to slide right off the surface with very little friction. Further, additional research ...
- Hydrophobic Coating stock illustrationson April 5, 2021 at 6:45 am
Modern wire frame mesh design vector illustration. hydrophobic coating stock illustrations Futuristic functional material concept with glowing low... Futuristic functional material concept with ...
- Super Material stock illustrationson March 25, 2021 at 12:51 pm
Design element for web banners, posters, cards, wallpapers, sites. Black and white color super material stock illustrations Abstract futuristic halftone pattern. Comic background. Dotted... Superhero ...
- Application of Super-hydrophobic Coating for Enhanced Water Repellency of Ballistic Fabricon August 17, 2020 at 7:06 pm
The objective of this work was to demonstrate that a superhydrophobic coating technology developed at Oak Ridge National Laboratory (ORNL) increases the water repellency of ballistic fabric beyond ...
- Hydrophobic Maton February 16, 2018 at 2:11 pm
Absorbs Oily Liquids — Repels Water MeltBlown polypropylene fibers are left in their natural hydrophobic state. These hydrophobic fibers repel water while only absorbing oils and other hydrocarbons.
- Super-hard Material Marketon September 29, 2017 at 12:03 pm
The solidity of super-hard material is valued at about 40 giga pascals (GPa). It can be measured using the Vickers test which processes about 40 GPa of hardness of super-hard material including ...
- Super Materials Are Leading Us to a New Age in Scienceon February 14, 2017 at 11:02 am
It's no secret that graphene is a pretty incredible super-material. Discovered in 2004, graphene is, simply, a layer of carbon atoms that is only one atom thick. It is ultra-light, yet it's 200 ...
- Rust-Oleum Specialty Fabric Treatment , 325 mLon June 23, 2015 at 2:31 pm
Fabric Treatment , 325 mL Rust-Oleum Never Wet Outdoor Fabric is a one-step, super hydrophobic, water repelling treatment designed to keep items dry longer. This crystal clear formula preserves ...
via Bing News