Release date: 2015-03-20

According to foreign media reports, Chameleon is a camouflage master in nature, able to change body color and integrate with the surrounding environment. Now, engineers at the University of California in the United States have developed chameleon-type artificial skin that can be used in military uniforms one day in the future, giving soldiers the same camouflage capabilities as chameleons. In design, this thin camouflage material only needs to be bent to change color as required.

Chameleon is a camouflage master in nature, able to change body color and integrate with the surrounding environment. Professor Chang Ruihua, a research team member, pointed out: "It is the first time to develop a soft chameleon skin that can change color only by bending."

Researchers say the new material makes it possible to develop new display technologies, discoloration camouflage, and sensors that detect tiny defects in buildings, bridges, and aircraft. The new chameleon material was developed by engineers at the University of California, Berkeley. Professor Chang Ruihua, a research team member, pointed out: "It is the first time to develop a soft chameleon skin that can change color only by bending."

During the study, engineers etched tiny features that were not as large as the wavelength of the light onto a silicon film that was only one-thousandth of the diameter of the hair. These engravings allow them to choose the color of the reflection of this material, depending on how the material is bent. When white light shines on pigments and fabrics, we see their color. The unique chemical structure of each surface absorbs light of different wavelengths, and the unabsorbable light is reflected. Light with a shorter wavelength gives the object a blue color, light with a longer wavelength gives the object a red color, and color is the product of a combination of multiple wavelengths of light.

The color of the leaves changes during the fall because the internal chemical composition changes. Researchers have shown that by controlling the tiny features of the surface, they can interact with light of a specific wavelength, reflecting light at this wavelength, and thus changing the color of the material. Professor Chang Ruihua pointed out that this "structural color" is rare in nature, and some butterflies and beetles can use the structural color to form a gorgeous body color.

To develop this color-changing material, the team etched a row of ridge structures on a thin layer of silicon, and the silicon layer was bonded to a layer of silicone to achieve soft and deformable properties. The ridge structure reflects light of a specific wavelength and does not form a complete iridescence. Professor Chang Ruihua said that by adjusting the space between the ridges, the material can be selected to reflect in a specific color. This discovery made them realize that discoloration can be achieved by making small changes in the space between the ridge and the ridge. This small change can be achieved by bending.

Silicone is a soft, flexible material that changes the space between the ridge and the ridge after bending. Professor Chang Ruihua pointed out: "If you have a surface with a highly precise structure, the space between the structures can interact with light of a specific wavelength, you can change this interaction by adjusting the space between the structures. ”

A research paper published in the journal Optica says that the material is easy to manufacture and reflects a specific color with a unique surface structure with a reflectivity of 83%. At present, engineers have created a chameleon-type material with an area of ​​1 square centimeter. They also need to do more research to use this material for fabric production. Professor Chang Ruihua said: "The next step is to carry out mass production. Facilities that can do this already exist. We hope to use this material for entertainment, security and surveillance."

Chameleon materials can also be used to create new billboards, active camouflage coatings for automobiles, and sensors for detecting fatigue in bridges, buildings, or wing structures. The photo shows the New Moon City Bridge in New Orleans

She pointed out that this chameleon material can be used to make new billboards, and the body can be actively camouflaged and further integrated into the surrounding environment by changing colors. In addition, this material can also be used to make sensors that reveal the structural fatigue of key components of bridges, buildings or wings by changing the color. Professor Chang Ruihua said: "It is the first time to achieve a specific light reflection on a thin and soft surface. I think this is so cool."

Source: Global Technology

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