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The anti-ripple plastic cover is invisible

Plastic dome with a new anti-reflective coating cover (to the right), and without a dome (to the left). Credit: Giebink Lab / Penn State

Plastic discovery discoveries (AR) have a wide range of practical applications, including glasses, computer monitors and glowing lights on the screen. Now, Penn State researchers have developed plastic AR coating to improve existing coatings for transparent plastics, such as Plexiglas, which is almost invisible.

"This discovery was trying to do high-efficiency solar panels," said Chris Giebink, associate professor of electrical engineering at Penn State. "Our approach to light is based on plastic lenses, small and high-efficiency solar cells, and minimize the loss of reflection."

The entire solar spectrum and multiple angles were required by the antireflection covering the entire spectrum of the sun, as the sun crossed the sky. They also needed a floor for a long time to keep out of the weather.

"We would like to find a compromise solution, but it was not in line with our performance demands," he said. "So we started looking for our solution".

That was the high order. Although the cover that eliminates a particular reflection in a particular wave or in a certain direction is comparatively simple, not all of the criteria are unmatched. For example, the coverage of the covered ARs is aimed at the visual spectrum of the spectrum. But the solar spectrum is about five times as wide as the spectacular spectrum, so this coverage would not be directed towards a complex solar cell system.

Reflections occur when the light travels from one medium to another, such as the air, in a second medium, in this case the plastic. If the difference in its refraction index is determined by determining the light velocity of a particular material, it has an open-air refractive index of 1 and 1.5 of plastic, then there will be a great deal of reflection. The lowest index of natural material coating, for example magnesium fluoride or Teflon, is 1.3. The index of the refractive index can be indexed, slowly between 1.3 and 1.5, mixing different materials, but the difference between 1.3 and 1 remains.

Before printing a newly published paper in the journal Nano LettersGwenbins and co-drivers describe a new process to overcome the gap between teflon and air. Teflon-evaporated nano-shell pores used a teflon-air film to create a teflon-air film against teflon-air shots, delivering a clear transient transition from 1 to 1.5, eliminating all the reflections.

"As a polymer of teflon, when it is heated on the wheel, large polymers are shrinking in smaller parts, trying to evaporate the steam flow and bring it to the ground," said Giebink.

When sacrifice molecules are added to the flow, Teflon will reform the molecule. To allow the dissolution of the molecules to dissolve, it is possible to classify them by adding more pore to a nanoporated film.

"We are interacting with companies that are looking for better plastic microflexion coatings, and some applications have been amazing," he said. "They are extending beyond the plastic vents that protect the security cameras by eliminating the narrow reflections within the virtual / augmented reality headphones."

An unexpected app is located at high UAV or in aerial vehicles. These are the giant wingspans covered with solar cells. It is mostly used for testing, the planets remain the sun's light in constant flight, and therefore the light they receive is a very eye-catching angle and the highest reflections. A company engaged in solar cells explores the coverage of RA to improve the amount of light collected by a UAV.

Because technology is compatible with today's manufacturing techniques, Giebink thinks that roofing technology is scalable and highly applicable. At this point, his trial samples were in the center of central Pennsylvania for two years, with the slightest change in properties. In addition, it is also an antifogging coating.

"It fits into different types of plastic coating, but not glass," he said. "That's why the typical solar panel of your roof will not be useful with glass shelves. However, if we combine photovoltaic, a critical aspect of Fresnel lens is plastic, one of which we can change."

Explore more:
Next-generation anti-glare coating can improve the efficiency of photovoltaic cells

More information:
Baomin Wang et al, Graded-Index Fluoropolymer Antireflection Coatings for Invisible Plastic Optics, Nano Letters (2019). DOI: 10.1021 / acs.nanolett.8b03886

Magazine reference:
Nano Letters

Pennsylvania State University

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