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For those with a tendency to obsessive-compulsive disorder, fingerprints on flat screens must be a nightmare. To make a waterproof surface easy, why is it so difficult to make an oil-resistant surface? This is because the surface tension of the oil is low, so a very special surface roughness is required. This sounds very simple, but no one has actually made such a texture.
But now, researchers at the Max Planck Institute for Polymer Research in Mainz, Germany, believe that they have found a solution that combines silica with the soot of candles and that they are suitable Baking at temperature. This method at least looks simple and cheap, right?
Researchers experimented with glasses that showed very bad fingerprints. First, they lifted the glass sheet above the candle so that the soot could be deposited on the glass surface. Globular soot is approximately 30 to 40 nanometers in diameter and is quite loosely packed. In fact, about 80% of the cavities and 20% of the pellets in the coating provide the proper roughness for oil protection.
To protect the smoke from being washed away, they were covered with a 25-nm-thick silicon dioxide layer; in order to remove the black color of the soot, they baked the glass sheet at 600°C to make it transparent.
So they finally got the oil-proof glass! They even managed to take a high-speed picture of a few drops of peanut oil jumping up and down on their surface. Fortunately, this coating can also adhere to aluminum, steel and copper. And because it repels both oil and water, they say that the material is "superamphiphobic".
The 5 micron oil particles rebound on the surface of the material.
Now, they only need to come up with a way to industrialize this process without having to hold a huge glass piece above the candle. Doris Vollmer, a materials scientist for the Max Planck team, said that while researchers use candle soot, similar size soot particles are available in the market, which can be demonstrated and hopefully Large-scale low-cost manufacturing. This team is exploring business partners to advance this technology.
Walmer said, "In many applications, people like to exclude oil. Some things only repel water is not enough." It is conceivable that if you can really make it on a large scale, the market for this technology will include touch screens.
However, there is a problem with the Max Planck coating. Compared to various waterproof surfaces, it may be easily scratched or worn. Therefore, Volme admitted that this material technology needs to be further improved to make a real scratch and oil proof product.
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