According to a recent paper published by the British "Nanotechnology" magazine, American scientists have reported a new "sunflower" material that can be perfectly aligned with the beam direction. The material is in the shape of a cylinder and has "artificial lightness" and can move with the light beam-just like a sunflower rotates with the sun.
Phototropism is very common in nature, referring to the movement of organisms with light sources for the purpose of foraging or reproduction. For example, the phototropism of plants can enable plants to get more light, which in turn improves photosynthesis and maintains plant growth.
However, the exact mechanism of phototropism is still under study, and this very common feature in plants is not easy to simulate. For a long time, "artificial phototropism" has been difficult to achieve because it is very difficult to achieve an appropriate balance between material composition and characteristics.
This time, UCLA researcher He Ximin and his colleagues combined a photosensitive nanomaterial that can effectively absorb light and convert it into heat with a heat-sensitive polymer that shrinks when heated to do Into a small cylindrical shape. When irradiated with light, the cylinder absorbs the light and the temperature rises, but only on the side facing the light source. As the material shrinks towards the light side, the cylinder bends towards the beam. Once the top of the cylinder is aligned with the light beam, the lower part of the cylinder in the light and shadow begins to cool, expand and stop moving. These cylinders can continue to rotate with the beam, and the steering range is very wide.
The researchers believe that this research may be used to improve the efficiency of light-trapping materials, because the newly developed cylindrical material will automatically bend, so that the top end receives the maximum amount of light. (Reporter Zhang Mengran)
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