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nanotechnology prints colors that will never fade

by:Tuowei     2019-09-05
According to a new study, laser printers that \"carve\" images at tiny scales can one day make color photos that don\'t fade over time like ink.
Researchers at the Danish University of Technology have produced a sheet of polymer and semiconductor metal that uses tiny structures to diffraction, absorb and reflect light at different wavelengths, reflecting colors that never fade.
The coating made of this material never needs to be re-painted, and over time the resulting images will keep it alive, scientists say.
The printing process also allows people to choose more specific colors because the exact wavelength can be chosen, which means less speculation about mixing pigments and comparing color charts, the researchers said.
The same technology can be used to make watermarks, even encryption and data storage, the researchers said. [
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Connecticut\'s mother, Virginia Beach shooting protesters, interrupted Harris with this technique, and the image was printed with a laser that was shot into a thin sheet of plastic and burned on it.
These flakes are deposited by Nano
Make the polymer and ge into thin layers, small cylinders and small pieces of shape with a diameter of not more than 100 nm. (
In contrast, the average length of human hair is about 100,000 nm. )
\"We created nanometers.
\"Imprint,\" Zhu Xiaolong, a leading author of the study and a researcher on nanotechnology at the University of Technology in Denmark, told Life Science.
These are examples of lasers.
Printed color pattern 127,000 points per inch.
Similar to alaser printerdo, the Danish University of Technology, lasers reshape them by melting tiny structures.
Changing the intensity of the laser on a tiny scale melts the structure in different ways, so they have different geometric shapes.
That\'s why the image resolution can be so good, researchers say.
An image of an inkjet printer or laser printer usually consists of 300 to 2,400 points per inch. A nanometer-
The researchers say the pixel size is several thousand times smaller, which means the resolution of 100,000 points per inch.
In fact, the entire collection of pixels is like a miniature city of skyscrapers, domes and towers.
The researchers say that the white light can reflect, bend, or diffraction when it presents various shapes.
Some do not reflect certain wavelengths due to small shapes, while others scatter or bounce light.
According to this study, the result is that one sees a color, depending on the specific pattern of the shape.
Zhu said that the wings of the butterfly are similar to the way the feathers of the bird work.
The tiny structure covers the wings of the butterfly or the feathers of the bird, scattering the light in a specific way, making the color that people see.
However, the researchers said that the wings of the butterfly transmit some light and produce rainbow colors.
Zhu and his colleagues are more specific than that.
The combination of Ge and polymer means that they can control the wavelength reflected from a given spot, so they do not produce a rainbow effect.
Researchers say that means a single color that is vibrant where they want it.
Since the colors are built into the structure of the paper, they do not fade as if the pigment were exposed to light, the study said.
For example, ordinary paint fades under sunlight, because ultraviolet rays break down the chemicals that make up the pigment.
In addition to this, paint or ink is oxidized or detached when exposed to solvents, such as heavy-Detergent. (
Just drop some water on the inkjet image and you can see the ink become diluted and flowing. )
According to Chemical and Engineering News reports, in old masterpieces, there is even a phenomenon called \"metal soap\", which is based on the complex chemical reactions that occur during the aging of the paint.
Zhu and his colleagues used their technology to produce small pictures of the Mona Lisa and portraits of Niles pole, a Danish physicist, as well as a simple picture of women and bridges, each piece is about 1 inch in diameter.
In order to produce this printer on a large scale, the researchers said, researchers need to make laser technology smaller and may need different materials to make paper layers.
The material needs to have a high refractive index, which means it will bend a lot of light and absorb the light at the wavelength selected by the laser, they added.
In their experiments, the scientists chose green light as the wavelength and conducted experiments with silicon as the material. Zhu said that silicon is not as effective as absorbing green lasers.
Even germanium is possible, though, because it is not too expensive.
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He pointed out that the ge layer and the polymer layer are only 50 nm thick.
However, ge is not necessarily the best choice, Zhu said, because it does not produce green very well.
The new study was published last week in the journal scientific progress.
Original article about Live Science.
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