Still talking about iPhone plastic blue? This light blue is high grade blue

You must know that there is a kind of blue rose called blue enchantress, which is said to be very precious. However, there is no blue rose in the world. If you dye more, you will become a blue enchantress. Blue enchantress is a kind of artificial rose variety, which is made by transgenic and dyeing white rose. < / P > < p > throughout the whole plant kingdom, blue flowers are indeed rare species, accounting for less than 10% of the total, and many of them are not pure blue, but blue purple emitted by anthocyanins under alkaline conditions. Another fact is, according to a study, the most popular color in the world is blue. Blue is so beautiful, why not grow on flowers? Of course, flowers don’t bloom according to human’s preference. All they do is to survive. < / P > < p > because of chlorophyll. This is a standard answer, but why is chlorophyll, not cyanin? Chlorophyll can help the leaves absorb sunlight, especially red orange light and blue violet light. They don’t like green light, so the green light is reflected, so the leaves appear green. The key is that chlorophyll likes to absorb blue light, because blue light contains more energy. For plants, absorbing higher energy light can improve energy absorption efficiency, and they have no reason to give up such light. < / P > < p > such economical and affordable blue light is absorbed by plants without hesitation. The blue light cannot be reflected out and can not enter human eyes naturally. This is the reason why blue plants are rare. However, this is not the case in the animal kingdom. There are many blue animals. Generally speaking, a lot of pigment in the animal body is obtained by the food it eats. For example, flamingos like to eat shrimp, so their body powder, if the intake of carotenoids in the food is not enough, they will not look so “hot”, will appear some gray or white. So, there are so few blue plants in the world. Where do animals such as big blue flash butterflies and colorful peacocks “steal” the blue? < / P > < p > is light. All the colors we mentioned just now are presented by pigments. They belong to chemical colors. However, nature also has another strategy, which is simply to “color with light”. The colored light is interfered and diffracted by fine nanostructures on the surface, and only the color light with specific wavelength is reserved. Such colors are known as “structural colors” or “rainbow colors.”. From the visual point of view, the structure color looks like metallic luster, which is a bit like laser color in fashion color matching. And when viewed from different angles, different colors will appear. < / P > < p > if we put the wings of the big blue butterfly under a microscope. You’ll see the scales piled up first. If you catch a butterfly with your bare hands, you will leave something powdery on your fingers. That’s the scales on the wings of a butterfly. The scales under the microscope are arranged in perfect order. < / P > < p > keep zooming in and you’ll see that the scale is not a simple slice, it looks like a Christmas tree from the side, with several layers of bifurcation. In fact, each layer of bifurcation is a stratum corneum, thickness in dozens to hundreds of nanometers, these cuticle itself is transparent, adjacent cuticle between the air layer. You can think of it as a thousand layer cake. Layers of cream, layers of pancakes. < / P > < p > the effect of stratum corneum is similar to that of soap bubble. Transparent soap bubbles will appear rainbow like colors in the sun. This is because the film on the surface of the soap bubble will interfere. When the sun shines on the transparent film, part of the light is directly reflected on the outer surface. We call it the vanguard. Another part of the film is first injected into the film, which is reflected on the inner surface, and then refracted out of the film. We call it the post breaking force. After shooting out the film, the two beams of light from the front troops and the rear troops will meet and interfere. At this time, if the distance difference between the two beams of light is an integral multiple of its wavelength, the light waves will overlap and the signal will be enhanced. As we all know, different colors of light correspond to different wavelengths. So after the film interference, a certain wavelength of color light will become obvious. The specific color depends on the thickness of the film and the incident angle of light. When the film is thick or the incident light is relatively vertical, the bubble is blue; if the film is thin or the light is oblique, the bubble is warm yellow. < / P > < p > although the soap bubble has color, it is not strong. But what if you stack several bubbles together? On the scale “Christmas tree”, each cuticle layer is equivalent to a soap bubble film. When they are stacked together, the interference effect of the film will be significantly enhanced. If each layer produces a light blue after interference, then after 6-10 layers of accumulation, the blue light will continue to intensify, and the rest of the color light will continue to weaken, and finally the dazzling blue color will appear. When light is incident from different angles, the interference of the film changes, which explains why the color of butterfly wings varies from different angles. The principle of blue is similar to that of birds. < p > < p > pigment molecules will oxidize and fade with the passage of time, but the “pigment” of structural color is light. As long as the structure remains unchanged, there will always be brilliant colors where there is light. So the specimen of the great butterfly can always keep bright and never fade. However, structural colors also have weaknesses. As long as the structure changes, some strange phenomena may be seen. For example, you can try to spray alcohol on the wings of a large flash butterfly. The wings that were originally blue turn green in an instant. It’s not a magical chemical reaction, it’s just that alcohol fills the air between the cuticle. Because the refractive index of alcohol and air to light is different, the interference produces green light instead of blue light. From the perspective of bionics, structural color calculation is a very popular technology. Think of the colorful backplane of mobile phone, which is made by micro nano structure of structural color. Some people directly put some micro nano structures on a small piece of glass to project and reproduce the famous paintings. Continue ReadingVideo Number assistant internal test online! Four functions let you send 1g video on the computer